The present disclosure relates to an electric throttle grip for vehicles such as two or
5 three wheelers. More particularly, the present disclosure relates to an angle
detection device of the electric throttle grip for through shaft mounting that is
capable to provide linear output for controlling the speed of the vehicle.
BACKGROUND
10 The information in this section merely provides background information related to
the present disclosure and may not constitute prior art(s).
Generally, two wheeled vehicles such as motorcycles, scooters, etc., are provided
with an electric throttle grip to control vehicle speed. The electric throttle grip is
15 mounted on a handlebar of the vehicle. Particularly, the electric throttle grip is
provided with a combination of magnets and sensors to convert rotational
movement (mechanical energy) of the electric throttle grip into electrical signals
(electrical energy) that may use to control the speed of vehicle. As shown in figures
1 to 3, there are different mechanisms of magnets and sensors which are known in
20 the prior art.
As shown in figure 1, a magnet holder comprises a plurality of magnets (600) and
hall sensors (610) placed inside the magnet holder. The magnets have north (N) and
south (S) polarities. The magnets are positioned inside the magnet holder at the
25 periphery thereof. The magnets are placed as one magnet of north polarity is
interposed between two magnets of the south polarities. Each magnet abuts to one
another as no gap is provided therein. The magnets are magnetized radially of the
magnet holder. The hall sensors are placed at internal surface of the magnet holder
therefore, the manufacturing of the electric throttle grip is complex.
30
3
As shown in figure 2, a magnet (15) has shape of a tube and encapsulated a hall
element (17). The magnet has north and south polarities and magnetized along
circumferentially thereof. The magnet and the hall element, both are positioned
inside a hollow handlebar of the vehicle therefore, the manufacturing of the
5 handlebar and the electric throttle grip is complex.
As shown in figure 3, a throttle pipe is housed by a driver gear. The driver gear is
meshed with a driven gear. The driver gear has a throttle grip sensor whereas the
driven gear has a magnet. The driver and driven, both the gears are movable by
10 which there are more wear and tear in between these gear components.
Furthermore, there are other demerits associated with the mechanisms recited in
figures 1, 2 and 3, such as facing difficulty in calibration of hall sensor. The
construction of electric throttle grip is dependent of the shape of the handlebar of
15 the vehicle, as the hall sensor is placed inside the thereon. Therefore, the calibration
of electric throttle grip is difficult and multiple hall sensors are required to achieve
linear output.
Therefore, there is an immense need in the art to provide an electric throttle grip
20 having an angle detection device for through shaft mounting that overcomes one or
more shortcomings of the prior arts. Specifically, the present disclosure relates to
an angle detection device that has a unique magnetic circuit design. The said
magnetic circuit helps in achieving linear output. Furthermore, the present
disclosure relates to an angle detection device that has single hall sensor that helps
25 in achieving linear output. The construction of hall sensor is independent of the
handlebar of the vehicle where the hall sensor is to be clamped.
SUMMARY OF THE PRESENT INVENTION
One or more drawbacks of conventional angle detection systems, as described in
30 the prior art have been overcome and additional advantages are provided through
an angle detection device as claimed in the present disclosure. Additional features
4
and advantages are realized through the technicalities of the present disclosure.
Other embodiments and aspects of the disclosure are described in detail herein and
are considered to be a part of the claimed disclosure.
5 The present disclosure relates to an angle detection device for vehicles. The device
comprises a throttle pipe, a magnetic circuit, and a sensing unit. The throttle pipe is
rotatably mounted at a handlebar of the vehicle. The magnetic circuit is configured
with the throttle pipe. The magnetic circuit comprises a magnet holder and a
plurality of magnets. The magnet holder is positioned at end portion of the throttle
10 pipe. The plurality of magnets is secured inside the magnet holder. Each magnet of
the plurality of magnets is placed at periphery of the throttle pipe. A gap is formed
in between each two consecutive magnets of the plurality of magnets to achieve
linear output. The sensing unit is disposed at the handlebar of the vehicle. The
sensing unit is positioned adjacent to at least one magnet of the plurality of magnets
15 to sense the variation in magnetic flux generated through rotation of the throttle
pipe.
In an embodiment, each magnet of the plurality of magnets has an arc shape.
20 In an embodiment, each magnet of the plurality of magnets has a unique different
magnetization power from other magnets.
In an embodiment, the magnet holder is made of plastic material and has a
receptacle to secure the plurality of magnets.
25
In an embodiment, the gap formed in between two consecutive magnets is nonuniform.
In an embodiment, the plurality of magnets is rotatable with the rotation of the
30 throttle pipe.
5
In an embodiment, the sensing unit is a hall IC sensor.
In an embodiment, the sensing unit is disposed at outside of the magnetic circuit.
5 In an embodiment, the sensing unit is coupled with a Printed Circuit Board (PCB)
to generate voltage based on the sensed variation in magnetic flux.
In an embodiment, a programmable magnetic flux measurement device is
configured to generate electrical signals based on the voltage received from the PCB
10 in order to control speed of the vehicle.
In an embodiment, the magnets are made of materials selected from the group of
materials comprising ferrite, NdFeb, SmCo and any combination thereof.
15 The foregoing summary is illustrative only and is not intended to be in any way
limiting. In addition to the illustrative aspects, embodiments, and features described
above, further aspects, embodiments, and features will become apparent with
reference to the drawings and the following detailed description.
20 BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
The novel features and characteristics of the disclosure are set forth in the appended
description. The disclosure itself, however, as well as a preferred mode of use,
further objectives and advantages thereof, will best be understood by reference to
the following detailed description of an illustrative embodiment when read in
25 conjunction with the accompanying figures. One or more embodiments are now
described, by way of example only, with reference to the accompanying figures
wherein like reference numerals represent like elements and in which:
Figures 1, 2 and 3 illustrate the angle detection devices according to the prior art.
30
6
Figure 4 illustrates a perspective view of an angle detection device, in accordance
with the present application.
Figure 5 illustrates a perspective view of an angle detection device with magnetic
5 flux lines, in accordance with the present application.
Figure 6 illustrates a graph plotted in between magnetic flux density (By and Bz
flux density waveform) and throttle travelling angle, in accordance with the present
application.
10
Figure 7 illustrates a graph plotted in between atan function and throttle travelling
angle, in accordance with the present application.
Figure 8 illustrates a graph plotted in between analog electrical signal and throttle
15 travelling angle for single slope, in accordance with the present application.
Figure 9 illustrates a graph plotted in between analog electrical signal and throttle
travelling angle for dual slope, in accordance with the present application.
20 Figure 10 illustrates the open loop magnetic circuit of prior art.
Figure 11 illustrates the graph plotted in between magnetic flux density and throttle
travelling angle of prior art.
25 Figure 12 illustrates the graph plotted in between atan function and throttle
travelling angle of prior art.
The figures depict embodiments of the disclosure for purposes of illustration only.
One skilled in the art will readily recognize from the following description that
30 alternative embodiments of the assemblies and methods illustrated herein may be
employed without departing from the principles of the disclosure described herein.
7
DETAILED DESCRIPTION OF THE PRESENT INVENTION
While the invention is subject to various modifications and alternative forms,
specific embodiment thereof has been shown by way of example in the figures and
5 will be described below. It is to be noted that a person skilled in the art can be
motivated from the present disclosure and can perform various modifications.
However, such modifications should be construed within the scope of the invention.
The terms “comprises”, “comprising”, or any other variations thereof, are intended
10 to cover a non-exclusive inclusion, such that an assembly, setup, system, device
that comprises a list of components does not include only those components but
may include other components not expressly listed or inherent to such system or
device or setup. In other words, one or more elements in the system or apparatus or
device proceeded by “comprises a” does not, without more constraints, preclude the
15 existence of other elements or additional elements in the assembly or system or
apparatus.
Accordingly, it is an aim of the present disclosure to provide an electric throttle grip
for controlling vehicle speed.
20
Another aim of the present disclosure is to develop an angle detection device that
provides linear output.
Another aim of the present disclosure is to develop an angle detection device that
25 has simple manufacturing and easy calibration.
Another aim of the present disclosure is to develop an angle detection device that
has less wear and tear in compression with the conventional systems.
30 Yet another objective of the present disclosure is to provide an electric throttle grip
that has design flexibility.
8
Accordingly, the present disclosure relates to the construction and mechanism of an
electric throttle grip for vehicles. such as two-wheelers, three wheelers and the like.
Such vehicles have a handlebar to steer the vehicle. The electric throttle grip may
5 be installed on a handlebar of the vehicle. The handlebar along with other related
parts of the vehicle may have different configuration to adapt the electric throttle
grip. Accordingly, the components of the electric throttle grip may have different
dimensions and different outlook that is independent to the outlook of the vehicle.
Specifically, the present disclosure relates to develop an electric throttle device for
10 two-wheelers.
The electric throttle grip comprises an angle detection device for through shaft
mounting. The angle detection device has a magnetic circuit and a sensing unit. The
magnetic circuit and the sensing unit are installed at the through shaft. Here, the
15 through shaft may be defined as a hollow shaft having one or more components
accommodated therein and rotatably attached to mounting means of the vehicle.
It should be understood that above configuration is for the sake of describing the
invention properly. There may be other configurations which will be obvious to
20 person skilled in the art in view of the present patent application.
Further, embodiments of the present disclosure disclose an angle detection device
configured to detect the angle of through shaft for controlling the speed of the
vehicle, accordingly.
25
Reference will now be made to the angle detection device which is explained with
the help of figures. The figures are for the purpose of illustration only and should
not be construed as limitations on the assembly of the present disclosure. Wherever
possible, referral numerals will be used to refer to the same or like parts.
30
9
Figures 4 and 5 illustrate an angle detection device (100) for vehicle. The angle
detection device (100) comprises a magnetic circuit (2) and a sensing unit (6). The
handlebar has a throttle pipe (3) on which the magnetic circuit (2) is mounted. The
sensing unit (6) is mounted on a handlebar of the vehicle. The magnetic circuit (2)
5 may have a shape corresponds to the shape of throttle pipe (3) for mounting thereon.
Figure 4 illustrates mounting of the magnetic circuit (2) on the throttle pipe (3). The
magnetic circuit (2) may be placed at end portion of the throttle pipe (3) whereas
remaining portion of the throttle pipe (3) is configured to actuate the throttle pipe
10 (3). The throttle pipe (3) may have a shape of hollow cylinder. The throttle pipe (3)
is rotatably mounted on the handlebar of the vehicle. The throttle pipe (3) may be
located at end portion of the handlebar of the vehicle. The throttle pipe (3)
encapsulates the end portion of the handlebar such that the central axis of the throttle
pipe (3) intersects the longitudinal axis of the vehicle. The throttle pipe (3) is
15 configured to rotate against the handlebar of the vehicle upon receiving actuation
by a user. The magnetic circuit (2) is positioned on the throttle pipe (3) so that the
magnetic circuit (2) can rotate with the rotation of the throttle pipe (3). The
magnetic circuit (2) comprises a magnet holder (5) and a plurality of magnets (1a,
1b, 1c) with different magnetization powers. The magnet holder (5) is positioned at
20 the end portion of the throttle pipe (3). The magnet holder (5) may have a cylindrical
shape. The magnet holder (5) has a hole at center thereof. The hole may be
configured to clamp the magnet holder (5) on the throttle pipe (3) so as to clamp
the magnet holder (5) on the throttle pipe (3). The magnet holder (5) is made of
plastic material. The magnet holder (5) has at least one receptacle. The receptacle
25 may have different irregular shapes. Preferably, the receptacle has circular shape.
The receptacle is configured to secure the plurality of magnets inside the magnet
holder (5). The plurality of magnets (1a, 1b, 1c) may have a shape of arc. The
plurality of magnets (1a, 1b, 1c) are positioned at periphery of the throttle pipe (3).
The plurality of magnets (1a, 1b, 1c) are fixedly secured inside the magnet holder
30 (5) so that the plurality of magnets (1a, 1b, 1c) can rotate with the rotation of the
magnet holder (5). The plurality of magnets (1a, 1b, 1c) are positioned such that a
10
gap (4) is formed in between each consecutive two magnets of the plurality of
magnets (1a, 1b, 1c). This gap (4) is configured to magnetize the plurality of
magnets (1a, 1b, 1c) with different magnetization powers in different directions for
achieving linear output. Particularly, the plurality of magnets (1a, 1b, 1c) are
5 magnetized in the thickness directions thereof that help in achieving the linear
output. The gap (4) in between each consecutive two magnets of the plurality of
magnets (1a, 1b, 1c) may non-uniform.
Figure 5 illustrates mounting of sensing unit (6) on the handlebar of the vehicle and
10 positional relationship of the sensing unit (6) with the plurality of magnets (1a, 1b,
1c). The sensing unit (6) has a hall IC sensor. The hall IC sensor (6) is positioned
adjacent to at least one magnet of the plurality of magnets (1a, 1b, 1c) to keep the
hall IC sensor (6) in the range of magnetic flux generated by the plurality of magnets
(1a, 1b, 1c). The magnetic flux varies with the movement of the plurality of magnets
15 (1a, 1b, 1c) and the hall IC sensor (6). The sensing unit (6) is disposed at outside of
the magnetic circuit (2). The hall IC sensor (6) is electronically coupled with a
Printed Circuit Board (PCB) (not shown). The PCB is configured to generate
voltage based on the variation in magnetic flux sensed by the hall IC sensor (6).
There are other related components/devices that are attached with the PCB so that
20 the speed of the vehicle can control in respect of the amount of voltage generated
by the PCB. Preferably, a programmable magnetic flux measurement device (not
shown) is configured to generate electrical signals based on the voltage received
from the PCB in order to control speed of the vehicle. Such construction may be
used for through shaft sensor. As the throttle pipe (3) rotates, the hall IC (6) senses
25 magnetic flux generated from the plurality of magnets (1a, 1b, 1c) with different
magnetization powers and produce sine and cosine waveforms (7, 8). The
programmable magnetic flux measurement device receives the sine and cosine
waveforms produced by the hall IC sensor (6) to calculate angular position of the
throttle pipe (3) and accordingly, generates electronic signals, in order to control
30 speed of the vehicle.
11
In operation, when a user rotates the throttle pipe (3), the magnet holder (5) with
the plurality of magnets (1a, 1b, 1c) with different magnetization powers rotates
with the rotation of the throttle pipe (3) and the hall IC sensor (6) sense variation in
magnetic flux generated through the rotation of the plurality of magnets (1a, 1b, 1c)
5 with different magnetization powers. Based on the amount of sensed variation in
magnetic flux, the sine and cosine waveforms (7, 8) generate. The voltage generated
by the sine and cosine waveforms, transfers to the programmable magnetic flux
measurement device to control the speed of the vehicle.
10 Figure 6 illustrates graph of sine and cosine waveforms (7, 8) generated by the hall
IC sensor (6). The sine and cosine waveforms (7, 8) are generated based on the
variation of magnetic flux sensed by the hall IC sensor (6). The PCB is configured
to generate voltage based on the sine and cosine waveforms (7, 8). Further, the
programmable magnetic flux measurement device generates electrical signals based
15 on the amount of voltage received from the PCB. The amount of variation in
magnetic flux sensed by the hall IC sensor (6) depends on the rotational movement
of the plurality of magnets (1a, 1b, 1c) with different magnetization powers. The
plurality of magnets (1a, 1b, 1c) with different magnetization powers and the hall
IC sensor (6) are provided to convert mechanical rotation of the throttle pipe (3)
20 into analog voltage output by mapping By and Bz vectors of the plurality of magnets
(1a, 1b, 1c). This arrangement helps in detecting the throttle pipe (3) position and
in adjusting vehicle speed based on the rotation of the throttle pipe (3).
In an exemplary embodiment, three arc magnets (1a, 1b, 1c) are press fitted in the
25 magnet holder (5) to form a closed loop magnetic circuit. The magnets (1a, 1b, 1c)
are made of materials selected from the group of materials comprising ferrite,
NdFeb, SmCo and any combination thereof. The plurality of magnets (1a, 1b, 1c)
are magnetized. The hall IC sensor (6) generates sine and cosine waveforms (7, 8).
When the throttle pipe (3) rotates about central axis thereof, the plurality of magnets
30 (1a, 1b, 1c) rotates with the rotation of the throttle pipe (3). Thus, the hall IC sensor
(6) detects magnetic flux vectors By and Bz, as shown in figure 6.
12
Figure 7 illustrates a graph plotted in between atan (Bz,By)(9) and the throttle pipe
angle generated through rotational movement thereof. The phase shifts between
sine and cosine waveforms (7, 8), by angle 90°, upon sensing the variation in
5 magnetic flux. The sine and cosine magnetic flux vectors expresses as atan (Bz/By)
(9) to calculate the rotational angle of throttle pipe (3). The sine and cosine magnetic
flux vectors may be converted into electrical signals by the hall IC sensor (6). For
linear output, the Hall IC sensor (6) may be calibrated by numbers of points in range
of 2 to 32 points. The programmable magnetic flux measurement device may be
10 configured to measure an angle generated upon rotation of throttle pipe (3).
Figures 8 and 9 illustrate a single slope (10) and a dual slope (11). The single and
dual slope (10, 11) are created based on the electrical signals generated based on
the angle generated by the throttle pipe. There may be a multiple slope. The dual
15 slope signals may be created for cruise cancelation and regeneration system in an
electrical vehicle so as to charge battery.
Figures 10, 11 and 12 illustrate a conventional system of providing magnetic circuit.
In this mechanism, the magnetic circuit has single magnet. Therefore, the magnet
20 magnetizes diametrically. The conventional system comprises an open magnetic
circuit. Therefore, the losses of magnetic flux are more. This magnetic circuit
produces only Bz magnetic flux vector. Thus, the graphs recited in figures 11 and
12 is different from the graphs as recited in figures 6 and 7 of the angle detection
device. Hence, the conventional system is required to use tri-axis hall IC sensor for
25 through shaft angle sensing application. Therefore, an angle detection device (100)
with a unique magnetic circuit (2) and single hall IC sensor (6) is designed to
achieve linear output, as recited in figures 4 to 9.
The angle detection device (100) has several advantages over the prior art such as:
30 Single hall IC senor (6) is provided to achieve linear output. The calibration and
manufacturing of the hall IC sensor (6) are easy and independent from the shape of
13
the handlebar of the vehicle. Furthermore, the angle detection device (100) has less
wear and tear as there is no physical interaction between the plurality of magnets
(1a. 1b, 1c) and the hall IC sensor (6). Thus, the angle detection device (100) has a
long life. This angle detection device (100) is suitable for single slope, dual or
5 multiple slopes of the electrical signals. The size of hall IC sensor (6) is compact
and easy to mount on the handlebar of the vehicle.
A list of reference numerals corresponding to the components of the angle detection
device of the present disclosure is following:
10
Description Reference signs
Angle detection device 100
Plurality of magnets 1a, 1b, 1c
Magnetic circuit 2
Throttle pipe 3
Gap 4
Magnet holder 5
Sensing unit 6
Sine waveforms 7
Cosine waveforms 8
Atan function 9
Single slope 10
Dual slope 11
14
Equivalents:
With respect to the use of substantially any plural and/or singular terms herein,
those having skill in the art can translate from the plural to the singular and/or from
the singular to the plural as is appropriate to the context and/or application. The
5 various singular/plural permutations may be expressly set forth herein for sake of
clarity.
It will be understood by those within the art that, in general, terms used herein, and
especially in the appended claims (e.g., bodies of the appended claims) are
10 generally intended as “open” terms (e.g., the term “having” should be interpreted
as “having at least,” etc.). It will be further understood by those within the art that
if a specific number of an introduced claim recitation is intended, such an intent
will be explicitly recited in the claim, and in the absence of such recitation no such
intent is present. For example, as an aid to understanding, the following appended
15 claims may contain usage of the introductory phrases “at least one” and “one or
more” to introduce claim recitations. However, the use of such phrases should not
be construed to imply that the introduction of a claim recitation by the indefinite
articles “a” or “an” limits any particular claim containing such introduced claim
recitation to inventions containing only one such recitation, even when the same
20 claim includes the introductory phrases “one or more” or “at least one” and
indefinite articles such as “a” or “an” (e.g., “a” and/or “an” should typically be
interpreted to mean “at least one” or “one or more”); the same holds true for the use
of definite articles used to introduce claim recitations. In addition, even if a specific
number of an introduced claim recitation is explicitly recited, those skilled in the
25 art will recognize that such recitation should typically be interpreted to mean at least
the recited number (e.g., the bare recitation of “two recitations,” without other
modifiers, typically means at least two recitations, or two or more recitations). It
will be further understood by those within the art that virtually any disjunctive word
and/or phrase presenting two or more alternative terms, whether in the description,
30 claims, or drawings, should be understood to contemplate the possibilities of
including one of the terms, either of the terms, or both terms. For example, the
15
phrase “A or B” will be understood to include the possibilities of “A” or “B” or “A
and B.”
While various aspects and embodiments have been disclosed herein, other aspects
5 and embodiments will be apparent to those skilled in the art. The various aspects
and embodiments disclosed herein are for purposes of illustration and are not
intended to be limiting, with the true scope and spirit being indicated by the
following claims.

WE CLAIM:

1. An angle detection device (100) for vehicles, the device comprising:
a throttle pipe (3) rotatably mounted at a handlebar of the vehicle;
5 a magnetic circuit (2) configured with the throttle pipe (3); the magnetic circuit (2)
comprises:
- a magnet holder (5) positioned at end portion of the throttle pipe (3);
- a plurality of magnets (1a, 1b, 1c) secured inside the magnet holder (5),
wherein each magnet of the plurality of magnets (1a, 1b, 1c) is placed at periphery
10 of the throttle pipe (3), wherein a gap (4) formed in between each two consecutive
magnets of the plurality of magnets (1a, 1b, 1c) to achieve linear output;
a sensing unit (6) disposed at the handlebar of the vehicle, wherein the sensing unit
(6) is positioned adjacent to at least one magnet of the plurality of magnets (1a, 1b,
1c) to sense the variation in magnetic flux generated through rotation of the throttle
15 pipe (3).
2. The device (100) as claimed in claim 1, wherein each magnet of the plurality of
magnets (1a, 1b, 1c) has an arc shape.
20 3. The device (100) as claimed in claim 1, wherein each magnet of the plurality of
magnets (1a, 1b, 1c) has a unique different magnetization power from the other
magnets.
4. The device (100) as claimed in claim 1, wherein the magnet holder (5) is made
25 of plastic material and has a receptacle to secure the plurality of magnets (1a, 1b,
1c).
5. The device (100) as claimed in claim 1, wherein the gap (4) formed in between
two consecutive magnets (1a, 1b, 1c) is non-uniform.
30
17
6. The device (100) as claimed in claim 1, wherein the plurality of magnets (1a, 1b,
1c) is rotatable with the rotation of the throttle pipe (3).
7. The device (100) as claimed in claim 1, wherein the sensing unit (6) is a hall IC
5 sensor.
8. The device (100) as claimed in claim 1, wherein the sensing unit (6) is disposed
at outside of the magnetic circuit (2).
10 9. The device (100) as claimed in claim 1, wherein the sensing unit (6) is coupled
with a Printed Circuit Board (PCB) to generate voltage based on the sensed
variation in magnetic flux.
10. The device (100) as claimed in claim 1, wherein a programmable magnetic flux
15 measurement device is configured to generate electrical signals based on the voltage
received from the PCB in order to control speed of the vehicle.
11. The device (100) as claimed in claim 1, wherein the magnets (1a, 1b, 1c) are
made of materials selected from the group of materials comprising: ferrite, NdFeb,
20 SmCo and any combination thereof.