FORM – 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
(See section 10 and rule 13)
AN INTELLIGENT AIR-CONDITIONING COMPRESSOR CONTROL SYSTEM FOR
A VEHICLE
Applicant(s):
VE COMMERCIAL VEHICLES LTD
102, INDUSTRIAL AREA 1, PITHAMPUR- 454775, DIST. DHAR, MP, INDIA
Inventors:
(1) Anish Gadre
(2) Sakti Prasad Sarangi
The following specification particularly describes the invention and the manner in which it
is to be performed.
2
AN INTELLIGENT AIR-CONDITIONING COMPRESSOR CONTROL
SYSTEM FOR A VEHICLE
FIELD OF THE DISCLOSURE
[0001] This invention generally relates to a field of vehicle climate control and
power management systems, and in particular, to an intelligent air-conditioning5
compressor control system for a vehicle and method thereof.
BACKGROUND
[0002] The subject matter discussed in the background section should not be
assumed to be prior art merely as a result of its mention in the background section.
Similarly, a problem mentioned in the background section or associated with the10
subject matter of the background section should not be assumed to have been
previously recognized in the prior art. The subject matter in the background section
merely represents different approaches, which in and of themselves may also
correspond to implementations of the claimed technology.
[0003] Vehicle heating, ventilation, and air-conditioning systems are widely15
employed in automobiles to regulate cabin temperature and enhance occupant
comfort during operation. In conventional vehicle configurations, an air-
conditioning compressor is typically operated continuously when the air-
conditioning system is switched ON, drawing power from the engine or an electrical
energy source regardless of instantaneous driving conditions or power demand.20
[0004] During vehicle operation under high-load conditions, such as rapid
acceleration, hill climbing, towing, or power-demand driving modes, continuous
operation of the air-conditioning compressor imposes an additional load on the
engine or powertrain. Availability of propulsion power during such conditions is
critical to ensure adequate pickup, stable drivability, and safe vehicle maneuvering,25
particularly in vehicles with limited engine output.
[0005] However, in existing vehicle HVAC control strategies, the air-conditioning
compressor is not dynamically managed in response to real-time power-demand
conditions. As a result, continuous compressor operation during high-load events
increases overall energy consumption and reduces the effective power available for30
3
propulsion, leading to reduced acceleration response, poor drivability, and higher
fuel or energy consumption.
[0006] Additionally, conventional HVAC systems rely heavily on manual driver
intervention to switch OFF the air-conditioning system during high-load driving
scenarios. Such manual control may be inconsistent and dependent on driver5
awareness and driving behavior, thereby limiting the effectiveness of compressor
load management and resulting in suboptimal vehicle performance.
[0007] In some vehicles, simplistic control approaches may be implemented to limit
compressor operation based on fixed thresholds or single-parameter inputs.
However, these approaches often fail to accurately capture transient power-demand10
conditions and may cause frequent or abrupt compressor disengagement, leading to
noise, vibration, reduced component life, and occupant discomfort.
[0008] Conventional solutions aimed at improving vehicle performance or fuel
efficiency under high-load conditions often require extensive changes to HVAC
hardware, engine calibration, or powertrain architecture. Such modifications may15
increase system complexity, development cost, and validation effort, particularly
when implemented across existing vehicle platforms.
[0009] Another the patent application, “IN498520B,” titled “A/c compressor
control for improving fuel economy in multi-mode vehicle,” describes A/C
compressor control for improving fuel economy in multi-mode vehicle.To cater20
increasing demands of increasing Fuel Economy in passenger car market, a novel
method has been devised to control A/C compressor relay for reducing overall load
from the engine whenever possible. This is done without affecting Vehicle
performance and Customer comfort. The conditions for Switching OFF A/C
Compressor and the inhibition time duration are achieved through a complex25
algorithm embedded in Engine ECU. This algorithm takes input from many sensors
and finally leads to control of A/C compressor relay and other associated
components of powertrain.
[0010] Another patent application, "IN202311058089A," titled "System for
controlling actuation of ac in a vehicle and a vehicle thereof," describes system 10030
and a vehicle 120 for controlling actuation of Air Conditioner (AC) 102 therein. It
4
includes sensors 108 disposed at pre-defined positions within front body the vehicle
120, for sensing real-time position of a gear 110 of the vehicle 120. An actuator 104
is adapted to be coupled to the AC 102 of the vehicle 120. A controller 106 is
coupled to the actuator 104, and configured to generate a first set of signals in case
the gear 110 is sensed to be in a first position, wherein the generated first set of5
signals de-actuate the actuator 104, resulting in turning off of the AC 102 to enhance
acceleration of the vehicle 120.
[0011] In conventional vehicle HVAC and power management systems, operation
of an air-conditioning compressor is largely independent of real-time vehicle power
demand and driving load conditions. Such systems are typically configured to10
maintain continuous cabin cooling once activated, without actively prioritizing
propulsion power during high-load events such as acceleration, hill climbing, or
towing. As a result, continuous compressor operation imposes an additional
parasitic load on the engine or powertrain at critical moments, leading to reduced
pickup, degraded drivability, and increased fuel or energy consumption.15
Additionally, conventional approaches rely on manual driver intervention to
disengage the air-conditioning system, which is often inconsistent and dependent
on driver awareness. Existing designs also lack adaptive logic to smoothly
disengage and re-engage the air-conditioning compressor unit based on changing
load conditions, thereby limiting their effectiveness across diverse real-world20
driving scenarios. Consequently, traditional HVAC control strategies are associated
with suboptimal power utilization, reduced efficiency under power-demand
conditions, and an inability to proactively optimize vehicle performance while
maintaining occupant comfort.
OBJECTIVES OF THE INVENTION25
[0012] The objective of the present invention is to provide an intelligent air-
conditioning compressor control system for vehicles that automatically optimizes
power delivery and fuel efficiency by selectively disengaging the air-conditioning
compressor during high-load or power-demand driving conditions.
[0013] The objective of the present invention is to overcome limitations of30
conventional HVAC control strategies by implementing a real-time load-based
5
control algorithm that continuously evaluates vehicle operating parameters to
accurately determine power-demand conditions.
[0014] The objective of the present invention is to provide an adaptive control logic
having a dynamic threshold that varies based on driving mode and instantaneous
demand, thereby enabling context-aware compressor disengagement and re-5
engagement across diverse driving scenarios.
[0015] The objective of the present invention is to enable smooth transition of air-
conditioning compressor operation through controlled modulation, including pulse-
width modulation-based actuation, to minimize noise, vibration, and driveline
disturbances during compressor cut-off and restart events.10
[0016] The objective of the present invention is to provide full integration with a
vehicle electronic control unit and in-vehicle communication networks, including
controller area network interfaces, to ensure reliable data exchange, synchronized
control, and compatibility with existing vehicle architectures.
[0017] The objective of the present invention is to deliver a fully automatic and15
driver-independent compressor control system that operates without requiring
manual intervention, thereby improving consistency, usability, and overall driving
experience.
[0018] The objective of the present invention is to provide a low-cost, software-
driven implementation that leverages existing vehicle sensors and control hardware,20
minimizing additional component requirements and manufacturing complexity.
[0019] The objective of the present invention is to ensure a high level of system
robustness by incorporating fail-safe mechanisms and automatic recovery logic,
enabling safe default operation and reliable restoration of air-conditioning
functionality under fault or transient conditions.25
[0020] The objective of the present invention is to enhance overall vehicle
drivability, energy efficiency, and performance by intelligently prioritizing
propulsion power over cabin cooling during power-demand conditions while
maintaining occupant comfort during normal operation.
SUMMARY30
6
[0021] The present invention relates to an intelligent air-conditioning compressor
control system for a vehicle.
[0022] According to an aspect, an intelligent air-conditioning compressor control
system for a vehicle is disclosed. The intelligent air-conditioning compressor
control system comprises a plurality of vehicle operating sensors including at least5
a throttle position sensor configured to detect a throttle opening percentage, an
engine speed sensor configured to detect engine revolutions per minute, and a power
mode switch configured to indicate a power demand mode of the vehicle. The
intelligent air-conditioning compressor control system further comprises an
electronic control unit operatively connected to the plurality of vehicle operating10
sensors and configured to compute a power-demand index based on sensor inputs.
The intelligent air-conditioning compressor control system further comprises an air-
conditioning compressor unit operatively coupled to a vehicle battery and controlled
by the electronic control unit. Further, upon determination that the computed power-
demand index exceeds a predefined threshold corresponding to a high-load driving15
condition, the electronic control unit is configured to automatically issue a
compressor cut-off command to disengage the air-conditioning compressor.
Further, the electronic control unit is further configured to automatically resume
operation of the air-conditioning compressor when the power-demand index falls
below the predefined threshold, without requiring any manual driver input.20
[0023] According to another aspect, a method for operating an intelligent air-
conditioning compressor control system for a vehicle is disclosed. The method
comprises steps of detecting, via a plurality of vehicle operating sensors including
at least a throttle position sensor and an engine speed sensor, a throttle opening
percentage, engine revolutions per minute, and indicating, via a power mode switch25
a power demand mode of the vehicle. The method further comprises steps of
computing, via an electronic control unit operatively connected to the plurality of
vehicle operating sensors, a power-demand index based on sensor inputs. The
method further comprises steps of issuing, via an air-conditioning compressor unit
operatively coupled to a vehicle battery and controlled by the electronic control unit,30
automatically a compressor cut-off command to disengage the air-conditioning
7
compressor, upon determination that the computed power-demand index exceeds a
predefined threshold corresponding to a high-load driving condition. The method
further comprises steps of resuming, via the electronic control unit, automatically
operation of the air-conditioning compressor when the power-demand index falls
below the predefined threshold, without requiring any manual driver input.5
BRIEF DESCRIPTION OF THE DRAWINGS
[0024] The accompanying drawings illustrate various embodiments of systems,
methods, and embodiments of various other aspects of the disclosure. Any person
with ordinary skills in the art will appreciate that the illustrated element boundaries
(e.g., boxes, groups of boxes, or other shapes) in the figures represent one example10
of the boundaries. It may be that in some examples one element may be designed as
multiple elements or that multiple elements may be designed as one element. In
some examples, an element shown as an internal component of one element may be
implemented as an external component in another, and vice versa. Furthermore,
elements may not be drawn to scale. Non-limiting and non-exhaustive descriptions15
are described with reference to the following drawings. The components in the
figures are not necessarily to scale, emphasis instead being placed upon illustrating
principles.
[0025] FIG. 1 illustrates a block diagram of an intelligent air-conditioning
compressor control system for a vehicle, according to an embodiment of the present20
disclosure;
[0026] FIG. 2 illustrates a flowchart showing operations of the intelligent air-
conditioning compressor control system, according to an embodiment of the present
disclosure; and
[0027] FIG. 3 illustrates a flowchart showing a method for operating the intelligent25
air-conditioning compressor control system, according to an embodiment of the
present disclosure.
DETAILED DESCRIPTION
[0028] Some embodiments of this disclosure, illustrating all its features, will now
be discussed in detail. The words “comprising,” “having,” “containing,” and30
“including,” and other forms thereof, are intended to be equivalent in meaning and
8
be open ended in that an item or items following any one of these words is not meant
to be an exhaustive listing of such item or items or meant to be limited to only the
listed item or items. It must also be noted that as used herein and in the appended
claims, the singular forms “a,” “an,” and “the” include plural references unless the
context clearly dictates otherwise.5
[0029] Although any systems and methods similar or equivalent to those described
herein can be used in the practice or testing of embodiments of the present
disclosure, the preferred, systems and methods are now described. Embodiments of
the present disclosure will be described more fully hereinafter with reference to the
accompanying drawings in which like numerals represent like elements throughout10
the several figures, and in which example embodiments are shown. Embodiments
of the claims may, however, be embodied in many different forms and should not
be construed as limited to the embodiments set forth herein. The examples set forth
herein are non-limiting examples and are merely examples among other possible
examples.15
[0030] The present invention discloses various embodiments of an intelligent air-
conditioning compressor control system for a vehicle. Embodiments of the present
invention comprises a plurality of vehicle operating sensors including at least a
throttle position sensor configured to detect a throttle opening percentage, an engine
speed sensor configured to detect engine revolutions per minute, and a power mode20
switch configured to indicate a power demand mode of the vehicle. Embodiments
of the present invention further comprises an electronic control unit operatively
connected to the plurality of vehicle operating sensors and configured to compute a
power-demand index based on sensor inputs. Embodiments of the present invention
further comprises an air-conditioning compressor unit operatively coupled to a25
vehicle battery and controlled by the electronic control unit. Further, upon
determination that the computed power-demand index exceeds a predefined
threshold corresponding to a high-load driving condition, the electronic control unit
is configured to automatically issue a compressor cut-off command to disengage the
air-conditioning compressor. Further, the electronic control unit is further30
configured to automatically resume operation of the air-conditioning compressor
9
when the power-demand index falls below the predefined threshold, without
requiring any manual driver input.
[0031] FIG. 1 illustrates a block diagram of an intelligent air-conditioning
compressor control system (100) for a vehicle, according to an embodiment of the
present disclosure.5
[0032] In some embodiments, the intelligent air-conditioning compressor control
system (100) comprises a plurality of vehicle operating sensors configured to
continuously monitor real-time driving and engine conditions. The plurality of
vehicle operating sensors includes at least a throttle position sensor (102) configured
to detect a throttle opening percentage, an engine speed sensor (106) configured to10
detect engine revolutions per minute, and a power mode switch (108) configured to
indicate a power-demand driving mode. The sensor inputs collectively represent
instantaneous vehicle load and driver intent. The intelligent air-conditioning
compressor control system (100) is configured to operate automatically during
normal vehicle operation. The plurality of vehicle operating sensors may be existing15
production sensors already available within a vehicle architecture. The sensor-based
approach enables real-time assessment of high-load driving conditions.
[0033] The intelligent air-conditioning compressor control system (100) further
comprises an electronic control unit (104) operatively connected to the plurality of
vehicle operating sensors and configured to receive sensor signals in real time. The20
electronic control unit (104) processes the sensor signals to compute a power-
demand index indicative of current propulsion power requirements. The power-
demand index may be calculated using predefined algorithms that weigh throttle
position, engine speed, and power mode activation. The electronic control unit (104)
is configured to compare the computed power-demand index with a predefined25
threshold corresponding to a high-load driving condition. The threshold may be
fixed or adaptively adjusted based on vehicle operating modes. The electronic
control unit (104) enables centralized decision-making for compressor control.
[0034] In some embodiments, the electronic control unit (104) is configured to
determine a high-load driving condition when the throttle opening exceeds a30
predefined percentage. In one implementation, the throttle position sensor (102)
10
indicates a high-load condition when the throttle opening exceeds about ninety
percent. Such a condition corresponds to aggressive acceleration or overtaking
maneuvers. The electronic control unit (104) interprets this condition as a
requirement to prioritize propulsion power. The throttle-based determination allows
fast response during transient load events. The use of throttle position enables5
intuitive correlation with driver demand. This logic supports timely compressor
disengagement.
[0035] In some embodiments, the electronic control unit (104) is further configured
to determine a high-load driving condition based on engine speed. The engine speed
sensor (106) provides real-time engine revolutions per minute to the electronic10
control unit (104). When the engine speed exceeds a predefined threshold, such as
about two thousand revolutions per minute, the electronic control unit (104) may
identify increased engine load. This condition may occur during gradient climbing
or sustained acceleration. The engine speed-based evaluation complements throttle-
based detection. The combination improves accuracy of power-demand assessment.15
The electronic control unit (104) thereby supports robust detection of high-load
conditions.
[0036] Upon determination that the computed power-demand index exceeds the
predefined threshold, the electronic control unit (104) is configured to automatically
issue a compressor cut-off command. The air-conditioning compressor unit (110)20
cut-off command causes disengagement of an air-conditioning compressor unit
(110) to reduce parasitic load on the engine. The disengagement occurs without
requiring any manual driver input. In some embodiments, the air-conditioning
compressor unit (110) comprises an internal compressor controller configured to
smoothly disengage the air-conditioning compressor unit (110). Smooth25
disengagement reduces noise, vibration, and driveline shock. The controlled cut-off
improves vehicle drivability during power-demand events.
[0037] In some embodiments, the electronic control unit (104) is configured to
apply a minimum compressor off-timer after issuing the air-conditioning
compressor unit (110) cut-off command. The minimum off-timer prevents frequent30
ON and OFF cycling of the air-conditioning compressor (112) during fluctuating
11
load conditions. The timer ensures stable system behavior during transient driving
scenarios. The electronic control unit (104) maintains the air-conditioning
compressor unit (110) in a disengaged state until the off-timer has elapsed. This
strategy enhances component durability and system reliability. The minimum off-
timer logic reduces thermal and mechanical stress on the air-conditioning5
compressor unit (110). The approach contributes to long-term system robustness.
[0038] In some embodiments, the electronic control unit (104) is configured to
automatically resume operation of the air-conditioning compressor (112) when
normal load conditions return. The air-conditioning compressor unit (110) is re-
engaged only after the computed power-demand index falls below the predefined10
threshold and the minimum compressor off-timer has elapsed. This dual-condition
requirement ensures that high-load conditions have fully subsided. The re-
engagement occurs automatically without driver intervention. The electronic
control unit (104) restores cabin cooling in a seamless manner. Controlled
reactivation maintains occupant comfort. The logic prevents premature compressor15
engagement.
[0039] In some embodiments, the air-conditioning compressor unit (110) is
operatively coupled to a vehicle battery and selectively switched ON or OFF based
on control signals generated by the electronic control unit (104). The power supply
configuration enables independent electrical control of the air-conditioning20
compressor unit (110). The air-conditioning compressor unit (110) controller
responds directly to electronic control unit (104) commands. This arrangement
allows precise modulation of compressor operation. The battery-powered
configuration supports both conventional and electrified vehicle architectures. The
selective switching enhances flexibility of system integration. The air-conditioning25
compressor unit (110) unit operates in coordination with overall vehicle power
management.
[0040] In some embodiments, the high-load driving condition comprises at least
one of rapid acceleration, gradient climbing, overtaking, or activation of the power
mode switch (108). The power mode switch (108) explicitly indicates driver intent30
for enhanced performance. The electronic control unit (104) integrates power mode
12
input with sensor-based load assessment. This combined logic enables adaptive
thresholding based on driving context. The intelligent air-conditioning compressor
control system (100) dynamically prioritizes propulsion power during demanding
scenarios. The approach improves responsiveness and driving confidence. The
control strategy is applicable across diverse driving environments.5
[0041] The intelligent air-conditioning compressor control system (100) improves
vehicle performance, fuel efficiency, and drivability by temporarily prioritizing
propulsion power over cabin cooling during high-load driving conditions. The
intelligent air-conditioning compressor control system (100) operates fully
automatically and is independent of driver actions. The architecture enables low-10
cost implementation through software integration with existing electronic control
unit (104)s. The intelligent air-conditioning compressor control system (100)
includes inherent fail-safe behavior by restoring compressor operation under normal
conditions. Automatic recovery ensures uninterrupted HVAC functionality. The
overall design provides a practical and scalable solution for modern vehicles. The15
intelligent air-conditioning compressor control system (100) is particularly
beneficial for vehicles with limited power output.
[0042] FIG. 2 illustrates a flowchart showing operations of the intelligent air-
conditioning compressor control system (100), according to an embodiment of the
present disclosure.20
[0043] At operation 202, the intelligent air-conditioning compressor control system
(100) is initiated when the vehicle ignition is switched ON.
[0044] At operation 204, upon initiation, the intelligent air-conditioning compressor
control system (100) begins monitoring key vehicle operating inputs including
throttle position, engine speed, and power mode status. The inputs collectively25
represent real-time vehicle load and driver power demand. The monitoring
operation is performed continuously during vehicle operation to ensure timely
detection of changing driving conditions. The monitored signals are communicated
to an electronic control unit (104) for further evaluation. The intelligent air-
conditioning compressor control system (100) remains active as long as the vehicle30
13
is in an ON state. This operation establishes the foundation for automated
compressor control.
[0045] At operation 206, the electronic control unit (104) evaluates whether the
vehicle has entered a power mode or a high-load driving condition. The evaluation
may be based on activation of a power mode switch (108), a throttle opening5
exceeding a predefined threshold, or an engine speed exceeding a predefined limit.
The electronic control unit (104) computes a power-demand index using one or
more of these inputs. If the power-demand index exceeds a predefined threshold,
the intelligent air-conditioning compressor control system (100) determines that a
high-load condition exists. This determination indicates that propulsion power10
should be prioritized. The decision logic operates in real time to respond to transient
load events.
[0046] At operation 208, upon determination that the vehicle is operating in power
mode or under high load, the electronic control unit (104) issues a compressor cut-
off command. The air-conditioning compressor unit (110) cut-off command causes15
disengagement of the air-conditioning compressor (112) to reduce parasitic load on
the engine. In some embodiments, the disengagement is performed smoothly
through a compressor controller to minimize noise, vibration, and driveline shock.
The air-conditioning compressor unit (110) remains disengaged without requiring
any manual driver input. This operation ensures maximum available power is20
delivered for vehicle propulsion. The intelligent air-conditioning compressor
control system (100) then transitions to a continuous monitoring state.
[0047] At operation 210, the electronic control unit (104) continuously monitors
engine and vehicle operating conditions while the air-conditioning compressor
(112) is disengaged. The monitoring includes reassessment of throttle position,25
engine speed, and power mode status. The electronic control unit (104) repeatedly
evaluates whether the power-demand index remains above the predefined threshold.
If the high-load condition persists, the air-conditioning compressor unit (110)
remains in a disengaged state. This continuous monitoring prevents premature re-
engagement of the air-conditioning compressor unit (110). The intelligent air-30
14
conditioning compressor control system (100) maintains stable operation during
sustained or transient high-load events.
[0048] At operation 212, the electronic control unit (104) determines whether the
power demand has returned to a normal operating level. The determination is made
when the computed power-demand index falls below the predefined threshold. In5
some embodiments, the electronic control unit (104) also verifies that a minimum
compressor off-timer has elapsed before permitting re-engagement. This dual-
condition check ensures reliable transition back to normal operation. The evaluation
is performed dynamically as driving conditions change. The intelligent air-
conditioning compressor control system (100) thereby avoids frequent compressor10
cycling.
[0049] At operation 214, upon confirmation that normal power demand conditions
are restored, the electronic control unit (104) allows continuation of normal air-
conditioning operation. The air-conditioning compressor (112) is re-engaged in a
controlled manner to restore cabin cooling. The re-engagement occurs automatically15
and smoothly without driver intervention. This operation balances occupant comfort
with power availability. The intelligent air-conditioning compressor control system
(100) resumes standard HVAC functionality once propulsion power is no longer
prioritized.
[0050] At operation 216, when the vehicle is switched OFF, the intelligent air-20
conditioning compressor control system (100) is deactivated. All monitoring and
control operations are terminated in response to vehicle shutdown. The intelligent
air-conditioning compressor control system (100) remains inactive until the next
vehicle start event. This operation ensures energy efficiency and system safety
during non-operation. The flow sequence is thereby completed for a given drive25
cycle.
[0051] FIG. 3 illustrates a flowchart showing a method (300) for operating the
intelligent air-conditioning compressor control system (100), according to an
embodiment of the present disclosure.
[0052] At operation 302, the plurality of vehicle operating sensors including at least30
the throttle position sensor (102) configured to detect a throttle opening percentage,
15
the engine speed sensor (106) configured to detect engine revolutions per minute,
and the power mode switch (108) configured to indicate a power demand mode of
the vehicle.
[0053] At operation 304, the electronic control unit (104) operatively connected to
the plurality of vehicle operating sensors and is configured to compute the power-5
demand index based on sensor inputs. The sensor inputs collectively represent
instantaneous vehicle load and driver intent. The intelligent air-conditioning
compressor control system (100) is configured to operate automatically during
normal vehicle operation. The plurality of vehicle operating sensors may be existing
production sensors already available within a vehicle architecture. The sensor-based10
approach enables real-time assessment of high-load driving conditions.
[0054] The electronic control unit (104) processes the sensor signals to compute a
power-demand index indicative of current propulsion power requirements. The
power-demand index may be calculated using predefined algorithms that weigh
throttle position, engine speed, and power mode activation. The electronic control15
unit (104) is configured to compare the computed power-demand index with a
predefined threshold corresponding to a high-load driving condition. The threshold
may be fixed or adaptively adjusted based on vehicle operating modes. The
electronic control unit (104) enables centralized decision-making for compressor
control.20
[0055] At operation 306, the air-conditioning compressor unit (110) operatively
coupled to a vehicle battery and controlled by the electronic control unit (104). Upon
determination that the computed power-demand index exceeds a predefined
threshold corresponding to a high-load driving condition, the electronic control unit
(104) is configured to automatically issue a compressor cut-off command to25
disengage the air-conditioning compressor (112).
[0056] In some embodiments, the electronic control unit (104) is configured to
determine a high-load driving condition when the throttle opening exceeds a
predefined percentage. In one implementation, the throttle position sensor (102)
indicates a high-load condition when the throttle opening exceeds about ninety30
percent. Such a condition corresponds to aggressive acceleration or overtaking
16
maneuvers. The electronic control unit (104) interprets this condition as a
requirement to prioritize propulsion power. The throttle-based determination allows
fast response during transient load events. The use of throttle position enables
intuitive correlation with driver demand. This logic supports timely compressor
disengagement.5
[0057] In some embodiments, the electronic control unit (104) is further configured
to determine a high-load driving condition based on engine speed. The engine speed
sensor (106) provides real-time engine revolutions per minute to the electronic
control unit (104). When the engine speed exceeds a predefined threshold, such as
about two thousand revolutions per minute, the electronic control unit (104) may10
identify increased engine load. This condition may occur during gradient climbing
or sustained acceleration. The engine speed-based evaluation complements throttle-
based detection. The combination improves accuracy of power-demand assessment.
The electronic control unit (104) thereby supports robust detection of high-load
conditions.15
[0058] The air-conditioning compressor unit (110) cut-off command causes
disengagement of an air-conditioning compressor unit (110) to reduce parasitic load
on the engine. The disengagement occurs without requiring any manual driver input.
In some embodiments, the air-conditioning compressor unit (110) comprises an
internal compressor controller configured to smoothly disengage the air-20
conditioning compressor unit (110). Smooth disengagement reduces noise,
vibration, and driveline shock. The controlled cut-off improves vehicle drivability
during power-demand events.
[0059] In some embodiments, the electronic control unit (104) is configured to
apply a minimum compressor off-timer after issuing the air-conditioning25
compressor unit (110) cut-off command. The minimum off-timer prevents frequent
ON and OFF cycling of the air-conditioning compressor (112) during fluctuating
load conditions. The timer ensures stable system behavior during transient driving
scenarios. The electronic control unit (104) maintains the air-conditioning
compressor unit (110) in a disengaged state until the off-timer has elapsed. This30
strategy enhances component durability and system reliability. The minimum off-
17
timer logic reduces thermal and mechanical stress on the air-conditioning
compressor unit (110). The approach contributes to long-term system robustness.
[0060] At operation 308, the electronic control unit (104) is further configured to
automatically resume operation of the air-conditioning compressor (112) when the
power-demand index falls below the predefined threshold, without requiring any5
manual driver input. The air-conditioning compressor unit (110) is re-engaged only
after the computed power-demand index falls below the predefined threshold and
the minimum compressor off-timer has elapsed. This dual-condition requirement
ensures that high-load conditions have fully subsided. The re-engagement occurs
automatically without driver intervention. The electronic control unit (104) restores10
cabin cooling in a seamless manner. Controlled reactivation maintains occupant
comfort. The logic prevents premature compressor engagement.
[0061] In some embodiments, the air-conditioning compressor unit (110) is
operatively coupled to a vehicle battery and selectively switched ON or OFF based
on control signals generated by the electronic control unit (104). The power supply15
configuration enables independent electrical control of the air-conditioning
compressor unit (110). The air-conditioning compressor unit (110) controller
responds directly to electronic control unit (104) commands. This arrangement
allows precise modulation of compressor operation. The battery-powered
configuration supports both conventional and electrified vehicle architectures. The20
selective switching enhances flexibility of system integration. The air-conditioning
compressor unit (110) unit operates in coordination with overall vehicle power
management.
[0062] In some embodiments, the high-load driving condition comprises at least
one of rapid acceleration, gradient climbing, overtaking, or activation of the power25
mode switch (108). The power mode switch (108) explicitly indicates driver intent
for enhanced performance. The electronic control unit (104) integrates power mode
input with sensor-based load assessment. This combined logic enables adaptive
thresholding based on driving context. The intelligent air-conditioning compressor
control system (100) dynamically prioritizes propulsion power during demanding30
18
scenarios. The approach improves responsiveness and driving confidence. The
control strategy is applicable across diverse driving environments.
[0063] Various embodiments of the present invention provide significant
advantages through an intelligent air-conditioning compressor control system (100)
for a vehicle, comprising a plurality of vehicle operating sensors including at least5
a throttle position sensor (102) configured to detect a throttle opening percentage,
an engine speed sensor (106) configured to detect engine revolutions per minute,
and a power mode switch (108) configured to indicate a power-demand mode of the
vehicle. An electronic control unit (104) is operatively connected to the plurality of
vehicle operating sensors and is configured to compute a power-demand index10
based on real-time sensor inputs. An air-conditioning compressor unit (110) is
operatively coupled to a vehicle battery and is selectively controlled by the
electronic control unit (104). Upon determination that the computed power-demand
index exceeds a predefined threshold corresponding to a high-load driving
condition, the electronic control unit (104) is configured to automatically issue a15
compressor cut-off command to disengage the air-conditioning compressor (112),
thereby reducing parasitic load on the engine and prioritizing propulsion power. The
high-load driving condition may include rapid acceleration, gradient climbing,
overtaking, or activation of the power mode switch (108). The throttle position
sensor (102) may indicate a high-load condition when a throttle opening exceeds20
about ninety percent, while the engine speed sensor (106) may indicate a high-load
condition when engine speed exceeds about two thousand revolutions per minute.
The electronic control unit (104) may further apply a minimum compressor off-
timer to prevent frequent cycling of the air-conditioning compressor (112). The air-
conditioning compressor unit (110) may include a compressor controller configured25
to smoothly disengage and re-engage the compressor to minimize noise, vibration,
and driveline shock. The electronic control unit (104) is further configured to
automatically resume compressor operation only after the power-demand index falls
below the predefined threshold and the minimum off-timer has elapsed, without
requiring any manual driver input. Collectively, the intelligent air-conditioning30
compressor control system (100) improves vehicle performance, fuel efficiency, and
19
drivability, particularly in vehicles with limited power output, while maintaining
occupant comfort through fully automatic and adaptive HVAC control.
[0064] It has thus been seen the intelligent air-conditioning compressor control
system (100) for a vehicle, as described. The intelligent air-conditioning compressor
control system (100) in any case could undergo numerous modifications and5
variants, all of which are covered by the same innovative concept; moreover, all of
the details can be replaced by technically equivalent elements. In practice, the
components used, as well as the numbers, shapes, and sizes of the components can
be whatever according to the technical requirements. The scope of protection of the
invention is therefore defined by the attached claims.10

CLAIMS

1. An intelligent air-conditioning compressor control system (100) for a vehicle,
the intelligent air-conditioning compressor control system (100) comprising:
a plurality of vehicle operating sensors including at least a throttle5
position sensor (102) configured to detect a throttle opening percentage, an
engine speed sensor (106) configured to detect engine revolutions per minute,
and a power mode switch (108) configured to indicate a power demand mode
of the vehicle;
an electronic control unit (104) operatively connected to the plurality10
of vehicle operating sensors and configured to compute a power-demand
index based on sensor inputs; and
an air-conditioning compressor unit (110) operatively coupled to a
vehicle battery and controlled by the electronic control unit (104),
wherein, upon determination that the computed power-demand index15
exceeds a predefined threshold corresponding to a high-load driving
condition, the electronic control unit (104) is configured to automatically
issue a compressor cut-off command to disengage the air-conditioning
compressor (112), and
wherein the electronic control unit (104) is further configured to20
automatically resume operation of the air-conditioning compressor (112)
when the power-demand index falls below the predefined threshold, without
requiring any manual driver input.
2. The intelligent air-conditioning compressor control system (100) as claimed25
in claim 1, wherein the high-load driving condition comprises at least one of
rapid acceleration, gradient climbing, overtaking, or activation of the power
mode switch (108).
3. The intelligent air-conditioning compressor control system (100) as claimed
in claim 1, wherein the throttle position sensor (102) is configured to indicate30
a high-load condition when a throttle opening exceeds about 90 percent.
4. The intelligent air-conditioning compressor control system (100) as claimed
in claim 1, wherein the engine speed sensor (106) is configured to indicate a
high-load condition when an engine speed exceeds about 2000 revolutions
per minute.
5. The intelligent air-conditioning compressor control system (100) as claimed5
in claim 1, wherein the electronic control unit (104) is configured to apply a
minimum compressor off-timer after issuing the air-conditioning compressor
unit (110) cut-off command to prevent frequent cycling of the air-
conditioning compressor (112).
6. The intelligent air-conditioning compressor control system (100) as claimed10
in claim 1, wherein the air-conditioning compressor unit (110) comprises a
compressor controller configured to smoothly disengage the air-conditioning
compressor unit (110) in response to the air-conditioning compressor unit
(110) cut-off command to reduce noise, vibration, and driveline shock.
7. The intelligent air-conditioning compressor control system (100) as claimed15
in claim 1, wherein the electronic control unit (104) is configured to
automatically re-engage the air-conditioning compressor (112) only after
both the power-demand index falls below the predefined threshold and the
minimum compressor off-timer has elapsed.
8. The intelligent air-conditioning compressor control system (100) as claimed20
in claim 1, wherein the air-conditioning compressor unit (110) receives power
directly from the vehicle battery and is selectively switched ON or OFF based
on control signals generated by the electronic control unit (104).
9. The intelligent air-conditioning compressor control system (100) as claimed
in claim 1, wherein the intelligent air-conditioning compressor control system25
(100) is configured to improve vehicle performance, fuel efficiency, and
drivability in vehicles having limited power output by temporarily prioritizing
propulsion power over cabin cooling during high-load driving conditions.
10. A method (300) for operating an intelligent air-conditioning compressor
control system (100) for a vehicle, the method (300) comprising:30
detecting, via a plurality of vehicle operating sensors including at least
a throttle position sensor (102) and an engine speed sensor (106), a throttle
opening percentage, engine revolutions per minute, and indicating, via a
power mode switch (108) a power demand mode of the vehicle;
computing, via an electronic control unit (104) operatively connected5
to the plurality of vehicle operating sensors, a power-demand index based on
sensor inputs;
issuing, via an air-conditioning compressor unit (110) operatively
coupled to a vehicle battery and controlled by the electronic control unit (104),
automatically a compressor cut-off command to disengage the air-10
conditioning compressor (112), upon determination that the computed power-
demand index exceeds a predefined threshold corresponding to a high-load
driving condition; and
resuming, via the electronic control unit (104), automatically
operation of the air-conditioning compressor (112) when the power-demand15
index falls below the predefined threshold, without requiring any manual
driver input.