FIELD OF INVENTION:
[001] The present subject matter described herein, relates to a system and a
method for creep controlling of vehicles having auto gear shift (AGS), and in
particularly, to a method and a system for inhibiting the creep mechanism in
automatic manual transmission (AMT) of the AGS vehicles.
BACKGROUND AND PRIOR ART:
[002] Vehicles have an internal combustion engine that acts as the sole source of
propulsion power in the vehicle. When an operator of a conventional vehicle
releases the brake pedal when the vehicle is at a complete stop, a small amount of
torque is realized at the wheels due to the torque from the engine operating at idle
speed. This is commonly referred to as “creep torque.”
15 [003] In conventional Automatic Manual Transmission (AMT) vehicle, while
driving in city traffic driver had to keep the brake pressed or Put the Gear Lever to
Neutral and engage Parking brake during STOPs or Traffic Red Lights to avoid
the forward motion in D- Range.
[004] Therefore, in the traffic condition driver has to pressed the brake again and
20 again and put the vehicle into neutral condition. In the traffic condition, driver has
to perform below mentioned actions frequently which creates fatigue to driver and
unpleasant driving experience:
[005] 1. Frequent pressing of brake pedal
[006] 2. Frequently changing gear lever from D range to Neutral
25 [007] 3. Frequently applying parking brake
[008] All the above mentioned actions has to be performed manually.
3
[009] Accordingly, there is a need in the state of the art to provide a mechanism by
which creep motion of the AMT vehicle can be automatically controlled in traffic
condition.
OBJECTS OF THE INVENTION:
[0010] The principal object of the present invention is to provide a system 5 and a
method for inhibiting creep of vehicle during traffic condition.
[0011] Another object of the present subject matter is to provide a system and a
method for inhibiting creeping of vehicle and engaging parking brake based on
vehicle stop condition.
10 [0012] Another object of the present subject matter is to provide a method and a
system to indicate driver about inhibition of creeping of the vehicle.
[0013] Another object of the present subject matter is to provide a system and a
method to dis-engage the parking brake when brake pedal is not pressed and
acceleration pedal is pressed beyond a defined threshold limit.
15 [0014] Yet another object of the present invention is to provide a simple and
inexpensive system for inhibiting creeping of vehicle.
SUMMARY OF THE INVENTION:
[0015] This summary is provided to introduce concepts related to inhibit creeping
of vehicle and applying parking brake automatically based on vehicle stop
20 condition. The concepts are further described below in the detailed description.
This summary is not intended to identify key features or essential features of the
claimed subject matter, nor is it intended to be used to limit the scope of the
claimed subject matter.
[0016] In an embodiment, a method for inhibiting and enabling creep mechanism
25 in automatic gear shift (AGS) vehicle is described herein. The method begins with
determining whether parking brake is dis-engaged and ascertaining whether a
vehicle is in stop condition when the parking brake is dis-engaged. Based on
affirmative ascertainment, transmitting creep inhibition signal to transmission
4
control unit (TCU). Based on the creep inhibition signal, engaging parking brake
and sending the parking brake signal to vehicle CAN.
[0017] In another embodiment, a creep control system for inhibiting and enabling
creep mechanism in automatic gear shift (AGS) vehicle is described herein. The
control system comprising a microcontroller coupled with input, CA5 N
input/output data, LED lights, Transmission control unit and parking brake circuit.
The microcontroller is configured to determine whether parking brake is disengaged
and ascertain whether a vehicle is in stop condition when the parking
brake is dis-engaged. Based on affirmative ascertainment, the microcontroller
10 transmits creep inhibition signal to transmission control unit (TCU) and engage
parking brake in the vehicle based on the creep inhibition signal and send the
parking brake status to vehicle CAN.
[0018] In order to further understand the characteristics and technical contents of
the present subject matter, a description relating thereto will be made with
15 reference to the accompanying drawings. However, the drawings are illustrative
only but not used to limit scope of the present subject matter.
BRIEF DESCRIPTION OF THE DRAWINGS
[0019] It is to be noted, however, that the appended drawings illustrate only
typical embodiments of the present subject matter and are therefore not to be
20 considered for limiting of its scope, for the invention may admit to other equally
effective embodiments. The detailed description is described with reference to the
accompanying figures. In the figures, the left-most digit(s) of a reference number
identifies the figure in which the reference number first appears. The same
numbers are used throughout the figures to reference like features and
25 components. Some embodiments of system or methods in accordance with
embodiments of the present subject matter are now described, by way of example,
and with reference to the accompanying figures, in which:
[0020] Fig. 1 illustrates block diagram of creep control system, in accordance
with an embodiment of the present subject matter; and
5
[0021] Fig. 2A, 2B, and 2C illustrate flow diagram for creep inhibition and
enabling based on parking brake status, in accordance with an embodiment of the
present subject matter.
[0022] The figures depict embodiments of the present subject matter for the
purposes of illustration only. A person skilled in the art will easily recognize 5 ize from
the following description that alternative embodiments of the structures and
methods illustrated herein may be employed without departing from the principles
of the disclosure described herein.
DESCRIPTION OF THE PREFERRED EMBODIMENTS:
10 [0023] The following is a detailed description of embodiments of the disclosure
depicted in the accompanying drawings. The embodiments are in such detail as to
clearly communicate the disclosure. However, the amount of detail offered is not
intended to limit the anticipated variations of embodiments; on the contrary, the
intention is to cover all modifications, equivalents, and alternatives falling within the
15 spirit and scope of the present disclosure as defined by the appended claims.
[0024] As used in the description herein and throughout the claims that follow, the
meaning of “a,” “an,” and “the” includes plural reference unless the context clearly
dictates otherwise. Also, as used in the description herein, the meaning of “in”
includes “in” and “on” unless the context clearly dictates otherwise.
20 [0025] Each of the appended claims defines a separate invention, which for
infringement purposes is recognized as including equivalents to the various elements
or limitations specified in the claims. Depending on the context, all references below
to the "invention" may in some cases refer to certain specific embodiments only. In
other cases, it will be recognized that references to the "invention" will refer to
25 subject matter recited in one or more, but not necessarily all, of the claims.
[0026] Groupings of alternative elements or embodiments of the invention disclosed
herein are not to be construed as limitations. Each group member can be referred to
and claimed individually or in any combination with other members of the group or
other elements found herein. One or more members of a group can be included in,
6
or deleted from, a group for reasons of convenience and/or patentability. When any
such inclusion or deletion occurs, the specification is herein deemed to contain the
group as modified thus fulfilling the written description of all groups used in the
appended claims.
[0027] These and other advantages of the present subject matter would 5 ould be
described in greater detail with reference to the following figures. It should be
noted that the description merely illustrates the principles of the present subject
matter. It will thus be appreciated that those skilled in the art will be able to devise
various arrangements that, although not explicitly described herein, embody the
10 principles of the present subject matter and are included within its scope.
[0028] FIG. 1 illustrates block diagram of creep control system, in accordance
with an embodiment of the present disclosure. The creep control system 100
(herein after interchangeably referred as system 100) which is implemented in
automatic manual transmission (AMT) vehicle to inhibit creep and engage
15 parking brake. The system 200 may be implemented as standalone device or in
integration with other existing devices, such as ECU in the vehicle. The system
100 is provided on the vehicle to monitor speed and parking brake status of the
vehicle and to detect when creep has to be inhibit and parking brake has to be
engaged.
20 [0029] The system 100 consist a microcontroller 105 that is coupled with digital
input receiver 103 that receives inputs from creep inhibitor switch and CAN
input/output receiver 104 to receive vehicle CAN 102 inputs and transmit
signal/status of the parking brake to the vehicle CAN 102. The vehicle CAN 102
receives inputs from a plurality of sensors, such as vehicle speed sensor, brake
25 pedal sensor, acceleration pedal sensor, parking brake sensor placed in the vehicle
at different locations. The vehicle CAN 102 transmit all the received inputs from
the plurality of sensors to the microcontroller 105 of the system 100 for further
processing. The microcontroller 105 is coupled with an output interface 106 that
transmits digital output to a plurality of coupled devices. With the output interface
30 106 is coupled with parking brake (PB) status LED 107 and creep inhibition (CI)
7
status LED 108. The output interface 106 is also coupled with a transmission
control unit 109 of the vehicle to transmit creep inhibition and enabling signals.
The output interface 106 further coupled with the Bi-directional Direct Current
(BLDC) motor circuit 110 that actuates the BLDC motor for engaging and disengaging
of the parking brake. The BLDC motor circuit 110 sends parking 5 ng brake
status to the vehicle CAN. The micro-controller 105 transmits the signals to the
TCU 109 and the BLDC motor circuit 110 based on predefined conditions as
stored in the micro-controller 105.
[0030] The microcontroller 105 includes an interface(s) 202 and memory 204.
10 The interface(s) may include a variety of interfaces. The interface(s) may also
provide a communication pathway for one or more components of the
microcontroller 105. The microcontroller 105 manipulate data based on
operational instructions. The micro-controller 200 may have module to store
executable instructions.
15 [0031] The microcontroller 105 may be implemented as a combination of
hardware and programming (for example, programmable instructions) to
implement one or more functionalities. In examples described herein, such
combinations of hardware and programming may be implemented in several
different ways. In the present description, the micro-controller 105 is implemented
20 as standalone device/system having programming executable instruction stored in
the memory. The micro-controller 105 execute these instructions and generate
signals based on the inputs and instructions and send the signals to corresponding
components to work accordingly.
[0032] Referring to figure 1, the system 100 is incorporated in the vehicle and
25 works when the vehicle is in traffic conditions. The system 100 is in
communication with the creep inhibitor switch 101 and vehicle CAN 102. The
system 100 reads data from the vehicle CAN 102 via CAN input/output receiver
104. The system 100 receives status of the creep inhibitor switch 101 whether it is
ON or OFF. If the creep inhibitor switch 101 is ON, the microcontroller 105
30 works on the received CAN inputs.
8
[0033] The microcontroller 105 receives real time data of vehicle via the vehicle
CAN 102. Based on the received data, the microcontroller () checks whether
parking brake is engaged or dis-engaged. When the parking gears are dis-engaged,
the micro-controller 105 ascertain whether a vehicle is in stop condition. To
ascertain vehicle stop condition at time (T) where time ‘T’ is time when brak5 e
pedal is pressed, the micro-controller 105 determine whether the vehicle speed is
zero at the time ‘T’ using vehicle speed signal via the vehicle CAN and also
determine whether vehicle speed is greater than zero at time ‘T-1’ second using
vehicle speed signal via the vehicle CAN. The micro-controller also determines
10 whether brake pedal is pressed based on brake pedal signal received via the
vehicle CAN. These all conditions may be checked simultaneously at same time
T.
[0034] Upon determination that vehicle is in stop condition, the microcontroller
105 further checks whether the vehicle is in actual stop condition or driver has
15 stopped the vehicle for fraction of second and applies the acceleration
immediately after applying the brake. To ascertain that the vehicle is in stop
condition and the brake pedal is pressed, the micro-controller 105 defines a timer
(TM) where the timer (TM) is initialized at zero second and determines the
vehicle speed when the timer (TM) is at 2 second via the vehicle CAN. If the
20 vehicle speed is zero and the brake pedal is pressed at time ‘TM’ 2 (two) second,
the micro-controller 105 ascertain that vehicle is in stop condition.
[0035] Based on affirmative ascertainment that vehicle is in stop condition, the
microcontroller 105 transmits creep inhibition signal to transmission control unit
(TCU) via the output interface 106. Further, the microcontroller 105 engages
25 parking brake (PB) in the vehicle based on the creep inhibition signal and send the
parking brake status to the vehicle CAN for further processing. After inhibiting
the creep and engaging the parking brake (PB), the microcontroller 105 switches
ON the parking brake (PB) status LED 107 and the creep inhibition (CI) status
LED 108 to indicate the driver that system 100 has applied the parking brakes and
9
inhibit the creep of the vehicle. Based on the indication, the driver may release the
brake pedal and relax in the traffic condition.
[0036] The microcontroller 105 receives real time data of vehicle via the vehicle
CAN 102. Based on the received data, the microcontroller () checks whether
parking brake is engaged or dis-engaged. When the parking gears are engaged, th5 e
micro controller 105 checks whether the brake pedal is pressed and acceleration
pedal is pressed beyond a defined threshold that more than 5%. The microcontroller
105 receives inputs about the brake pedal and the acceleration pedal via
the vehicle CAN. Further, the threshold limit is defined in the microcontroller.
10 The micro-controller 105 transmits creep enabling signal to the transmission
control unit (109) via the output interface when the parking brake is engaged, the
brake pedal is pressed and the acceleration pedal is pressed beyond the defined
threshold. Further, the micro-controller 105 dis-engage the parking brake in the
vehicle based on the creep enabling signal and send the parking brake dis-engage
15 signal to the vehicle CAN. The microcontroller 105 switches OFF creep inhibitor
(CI) status LED 108 and the parking brake (PB) status LED 106 via the digital
output interface based on the creep enable signal and parking brake dis-engaged
signal.
[0037] In an embodiment of the present subject matter, the parking brake are
20 electronic brakes and operated by Bi-directional DC (BLDC) motor. The microcontroller
105 sends parking brake engaging signal to the BLDC motor circuit 110
that rotates in clockwise direction to engage the parking brake. Similarly while
dis-engaging the parking brake, the micro-controller 105 sends parking brake disengagement
signal to the BLDC motor circuit 110 that rotates in anti-clockwise
25 direction to dis-engage the parking brake. The BLDC motor circuit 110 is coupled
with the vehicle CAN 102 to update engagement and dis-engagement of parking
brake.
[0038] In an embodiment, the present creep control system 100 is implemented in
the automatic gear shift (AGS) vehicle has automated manual transmission
30 (AMT). It may be implemented in the fully automatic transmission vehicles with
10
slight modifications which may be known to a person skilled in the art. The
present system may be implemented in hybrid or electric vehicles with required
modifications as per requirement of the vehicle.
[0039] Referring to fig. 2 which describes a method for inhibiting and enabling
creep in vehicle, in accordance with an embodiment of the present subject matte5 r.
The method 300 discloses how present system works to inhibit and enable creep
in vehicle during traffic conditions. As per the present method, the system 100 has
microcontroller 105 interacting with other controllers via Vehicle CAN to receive
inputs regarding brake pedal, acceleration pedal, vehicle speed. The order in
10 which the method is described is not intended to be construed as a limitation, and
any number of the described method blocks can be combined in any order to
implement the method 300 or any alternative methods. Additionally, individual
blocks may be deleted from the method without departing from the spirit and
scope of the subject matter described herein. Furthermore, the method(s) can be
15 implemented in any suitable hardware, software, firmware, or combination
thereof.
[0040] Referring to the method 300, the vehicle ignites the engine to activate or
initialize the creep control system 100.
[0041] At the step 302, the creep control system 100, specifically, the
20 microcontroller 105 receives real time data of vehicle through vehicle CAN
through CAN input/output receiver 104.
[0042] At step 304, the microcontroller 105 checks whether creep inhibitor switch
is ON or OFF. IF the creep inhibitor switch 101 is OFF, the microcontroller 105
back to step 302 to receive fresh real time inputs. If the creep inhibitor switch 101
25 is ON, the microcontroller 105 proceeds to step 306 to determine parking brake
status.
[0043] At step 306, the microcontroller 105 checks whether the parking brake is
engaged or dis-engaged. If the parking brake is engaged, the method proceeds to
block B. If the parking brake is dis-engaged, the method proceeds to block A.
11
[0044] Block A indicates method to be followed when parking brake is disengaged.
At step 308, the microcontroller 105 receives inputs regarding vehicle
speed and brake pedal via the vehicle CAN. The microcontroller 105 ascertain
whether the vehicle is in stop condition when the parking brake is dis-engaged. To
ascertain whether the vehicle is in stop condition at time (T), the microcontroll5 er
105 determines whether the vehicle speed is zero at the time (T) using vehicle
speed signal via the vehicle CAN. At time T-1, the microcontroller 105
determines whether vehicle speed is greater than zero using vehicle speed signal
via the vehicle CAN and determine whether brake is pressed based on brake pedal
10 signal via the vehicle CAN.
[0045] At step 302, a Timer (TM) is set with initialization to zero second to
further ascertain whether the vehicle is in stop condition. The microcontroller 105
define a timer (TM) with initialization to zero second. Further, the speed of the
vehicle is determined at time when timer is at 2 second. If the vehicle speed is
15 zero at 2 second and the brake pedal is pressed, the microcontroller 105 ascertain
that vehicle is in stop condition. The timer is clock which starts from zero second.
Further, the vehicle speed can be check or determined at any second, such as 3, 4,
5, however the best results are achieved at 2 second.
[0046] At step 312, based on affirmative ascertainment, Transmitting creep
20 inhibition signal to transmission control unit (TCU). The microcontroller 105
sends creep inhibition signal/request to the TCU via output interface 106. The
TCU inhibits the creep by maintaining the clutch in the transmission and send the
status signal to the vehicle CAN.
[0047] At step 314, engaging Parking brake based on the creep inhibition signal.
25 [0048] At step 316, based on the creep inhibition signal and parking brake
engaged signal, the microcontroller 105 switches ON creep inhibitor status LED
107 and parking brake status LED 108 in vehicle cabin to indicate driver. Based
on the indication, the driver may release the brake pedal.
12
[0049] At step 318, sending parking brake status to the vehicle CAN which is
transferred to step 302 for reading the vehicle CAN.
[0050] Block B indicates method to be followed when parking brake is engaged.
At step 320, checking of the brake pedal and the acceleration pedal is performed
based on the data received from the vehicle CAN. The microcontroller 105 ch5 eck
whether brake pedal is pressed and the acceleration pedal is pressed beyond a
defined threshold limit. The defined threshold limit is more than 5%. If both the
condition of the brake pedal and the acceleration pedal is not met, the method
proceeds back to step 302 to receive fresh inputs from the vehicle CAN. If both
10 the conditions met, the method proceeds to step 322.
[0051] At step 322, dis-engaging the parking brake in the vehicle when the brake
pedal is not pressed and the acceleration pedal is pressed more than defined
threshold limit.
[0052] At step 324, transmitting creep enabling signal to the transmission control
15 unit (TCU) via output interface 106 based on parking brake dis-engagement.
[0053] At step 326, the microcontroller 105 switch OFF the creep inhibition status
LED 107 and the parking brake status LED 108 and update the status to vehicle
CAN.
[0054] At step 328, sending parking brake dis-engagement status to vehicle CAN
20 which proceed to step 302 for processing.
[0055] In an embodiment, the parking brake are electronic brakes and operated by
Bi-directional DC motor circuit which is coupled to a BLDC motor. The Bidirectional
DC motor rotates in clockwise direction to engage the parking brake.
[0056] In an embodiment, the parking brake are electronic brakes and operated by
25 Bi-directional DC motor ciruit, wherein the Bi-directional DC motor rotates in
anti-clockwise direction to dis-engage the parking brake.
13
[0057] The above description does not provide specific details of manufacture or
design of the various components. Those of skill in the art are familiar with such
details, and unless departures from those techniques are set out, techniques,
known, related art or later developed designs and materials should be employed.
Those in the art are capable of choosing suitable manufacturing and design 5 n details.
[0058] It will be further appreciated that functions or structures of a plurality of
components or steps may be combined into a single component or step, or the
functions or structures of one-step or component may be split among plural steps
or components. The present invention contemplates all of these combinations.
10 Unless stated otherwise, dimensions and geometries of the various structures
depicted herein are not intended to be restrictive of the invention, and other
dimensions or geometries are possible. Plural structural components or steps can
be provided by a single integrated structure or step. Alternatively, a single
integrated structure or step might be divided into separate plural components or
15 steps. In addition, while a feature of the present invention may have been
described in the context of only one of the illustrated embodiments, such feature
may be combined with one or more other features of other embodiments, for any
given application. It will also be appreciated from the above that the fabrication of
the unique structures herein and the operation thereof also constitute methods in
20 accordance with the present invention. The present invention also encompasses
intermediate and end products resulting from the practice of the methods herein.
The use of “comprising” or “including” also contemplates embodiments that
“consist essentially of” or “consist of” the recited feature.
[0059] It should be understood, however, that all of these and similar terms are to
25 be associated with the appropriate physical quantities and are merely convenient
labels applied to these quantities. Unless specifically stated otherwise, as apparent
from the discussion herein, it is appreciated that throughout the description,
discussions utilizing terms such as “processing,” or “ascertaining,” or “receiving,”
or “actuating,” or “determining,” “defining,” or the like, refer to the action and
30 processes of a computer system, or similar electronic computing device, that
14
manipulates and transforms data represented as physical (electronic) quantities
within the computer system's registers and memories into other data similarly
represented as physical quantities within the computer system memories or
registers or other such information storage, transmission or display devices.
[0060] Further, the terminology used herein is for the purpose of describi5 ng
particular embodiments only and is not intended to be limiting of the disclosure. It
will be appreciated that several of the above-disclosed and other features and
functions, or alternatives thereof, may be combined into other systems or
applications. Various presently unforeseen or unanticipated alternatives,
10 modifications, variations, or improvements therein may subsequently be made by
those skilled in the art without departing from the scope of the present disclosure
as encompassed by the following claims.
[0061] The claims, as originally presented and as they may be amended,
encompass variations, alternatives, modifications, improvements, equivalents, and
15 substantial equivalents of the embodiments and teachings disclosed herein,
including those that are presently unforeseen or unappreciated, and that, for
example, may arise from applicants/patentees and others.
[0062] Although examples for the present disclosure have been described in
language specific to structural features and/or methods, it should be understood
20 that the appended claims are not necessarily limited to the specific features or
methods described. Rather, the specific features and methods are disclosed and
explained as examples of the present disclosure.

We claim:
1. A method for inhibiting and enabling creep mechanism in automatic gear
shift (AGS) vehicle, the method comprising:
determining (306), by a creep control system (100) having a 5 microcontroller
(105), whether parking brake is dis-engaged;
ascertaining (308, 310), by the creep control system (100), whether
a vehicle is in stop condition when the parking braking is dis-engaged;
based on affirmative ascertainment, transmitting (312), by the
10 creep control system (100), creep inhibition signal to transmission control
unit (TCU); and
engaging (314), by the creep control system (), parking brake in the
vehicle based on the creep inhibition signal.
15 2. The method as claimed in claim 1, wherein further comprises:
sending (328) parking brake status to vehicle CAN.
3. The method as claimed in claim 1, wherein further comprises:
checking (304), by the creep control system (100), whether creep
20 inhibitor switch is ON.
4. The method as claimed in claim 1, wherein the ascertaining (308) whether
the vehicle is in stop condition at time (T), comprises:
determining, by the control system (), whether vehicle speed is
25 zero at the time (T) using vehicle speed signal via vehicle CAN;
determining, by the control system (), whether vehicle speed is greater
than zero at time (T-1) using vehicle speed signal via the vehicle CAN; and
determining, by the control system (), whether brake is pressed based
on brake pedal signal via the vehicle CAN.
30
16
5. The method as claimed in claim 1, wherein the ascertaining (310) whether
the vehicle is in stop condition comprises:
defining, by the creep control system (100), a timer (TM) based on
affirmative ascertainment, wherein the timer (TM) is at zero second; and
determining, by the creep control system (100), whether 5 r the vehicle
speed when the timer (TM ) is at 2 second,
if the vehicle speed is zero and the brake pedal is pressed, the creep
control system (100) ascertain that vehicle is in stop condition.
10 6. The method as claimed in claim 1, wherein the method further comprising:
based on the creep inhibition signal and parking engaged signal,
switching ON creep inhibitor status LED (107) and parking brake status
LED (108) in vehicle to indicate driver.
7. The method as claimed in claim 1, further comprising:
15 checking (320) whether the parking brake is engaged based on parking
brake signal received via the vehicle CAN;
based on determination, determining, whether brake pedal is pressed;
based on determination, determining (320) whether acceleration pedal
is pressed beyond a defined threshold limit;
20 dis-engaging (322), by the creep control system (100), the parking
brake in the vehicle when the parking brake is engaged, the brake pedal is
pressed and the acceleration pedal is pressed beyond the defined threshold;
transmitting (324), by the creep control system (100), creep enabling
signal to the transmission control unit (TCU) based on the parking brake
25 dis-engagement.
8. The method as claimed in claim 7, wherein the defined threshold limit is
more than 5%.
30 9. The method as claimed in claim 7, wherein the method further comprises
17
based on the creep enable signal and parking brake dis-engaged
signal, switching OFF creep inhibitor status LED (107) and parking brake
status LE (108).
10. The method as claimed in claim 1, wherein the parking brake is electroni5 c
brakes and operated by Bi-directional DC motor circuit (110) coupled with
Bi-directional DC motor, wherein the Bi-directional DC motor rotates in
clockwise direction to engage the parking brake.
10 11. The method as claimed in claim 7, wherein the parking brake is electronic
brakes and operated by Bi-directional DC motor circuit (110) coupled with
Bi-directional DC motor, wherein the Bi-directional DC motor rotates in
anti-clockwise direction to dis-engage the parking brake.
15 12. The method as claimed in claim 1, wherein the automatic gear shift (AGS)
vehicle has automated manual transmission (AMT).
13. A creep control system (100) for inhibiting and enabling creep mechanism
in automatic gear shift (AGS) vehicle, the creep control system (100)
20 comprising:
a microcontroller (105) is to:
determine whether parking brake is dis-engaged;
ascertain whether a vehicle is in stop condition when the parking
braking is dis-engaged;
25 based on affirmative ascertainment, transmit creep inhibition signal
to transmission control unit (TCU); and
engage parking brake in the vehicle based on the creep inhibition
signal and send parking brake signal to vehicle CAN.
30 14. The creep control system (100) as claimed in claim 13, wherein the
microcontroller (105) is to:
18
check whether creep inhibitor switch (101) is ON via digital input
receiver (103) which is coupled with the creep inhibitor switch (101).
15. The creep control system (100) as claimed in claim 13, wherein the microcontroller
(105) ascertains whether the vehicle is in stop condition at tim5 e
(T), comprises:
determine whether the vehicle speed is zero at the time (T) using
vehicle speed signal via the vehicle CAN;
determine whether vehicle speed is greater than zero at time (T-1)
10 using vehicle speed signal via the vehicle CAN; and
determine whether brake pedal is pressed based on brake pedal signal
via the vehicle CAN.
16. The creep control system (100) as claimed in claim 13, wherein the
15 microcontroller (105) is to:
define a timer (TM) based on affirmative ascertainment, wherein
the timer (TM) initialized at zero second; and
determine the vehicle speed when the timer (TM) is at 2 second,
if the vehicle speed is zero and the brake pedal is pressed, the
20 micro-controller (105) ascertain that vehicle is in stop condition.
17. The creep control system (100) as claimed in claim 13, wherein the
microcontroller (105) is to:
switches ON creep inhibitor status LED (107) and parking brake
25 status LED (108) via output interface (106) that is coupled to the
microcontroller (105) in vehicle, based on the creep inhibition signal and
parking engaged signal.
18. The creep control system (100) as claimed in claim 13, wherein the
30 microcontroller (105) is to:
19
determine whether the parking brake is engaged based on the parking
brake signal;
based on determination of the parking brake, determine whether the
brake pedal is not pressed;
based on determination of the parking brake, determine wheth5 er
acceleration pedal is pressed beyond a defined threshold;
dis-engage the parking brake in the vehicle based on the creep
enabling signal when the parking brake is engaged, the brake pedal is
pressed and the acceleration pedal is pressed beyond the defined threshold;
10 transmit creep enabling signal to the transmission control unit (100).
19. The creep control system (100) as claimed in claim 17, wherein the
defined threshold is more than 5%.
15 20. The creep control system (100) as claimed in claim 17, wherein the
microcontroller (105) is to:
switch OFF creep inhibitor status LED (107) and parking brake
status LED (108) via the output interface (106) based on the creep enable
signal and parking brake dis-engaged signal.
20
21. The creep control system (100) as claimed in claim 13, wherein the
parking brake is electronic brakes and operated by Bi-directional DC
motor circuit (110) coupled with Bi-directional DC motor, wherein the Bidirectional
DC motor rotates in clockwise direction to engage the parking
25 brake.
22. The creep control system () as claimed in claim 17, wherein the parking
brake is electronic brakes and operated by Bi-directional DC motor circuit
(110) coupled with Bi-directional DC motor, wherein the Bi-directional
30 DC motor rotates in anti-clockwise direction to dis-engage the parking
brake.
20
23. The creep control system (100) as claimed in claim 13, wherein the
automatic gear shift (AGS) vehicle has automated manual transmission
(AMT).