阅读说明：本技术 车辆起步阶段的离合器控制系统及方法 (Clutch control system and method for vehicle starting stage ) 是由 吴颂 翟克宁 韦树成 何超 李雄强 兰江 潘文军 秦志强 马洁高 周辉 龙祖荣 于 2020-06-23 设计创作，主要内容包括：本发明属于车辆离合器技术领域,公开了一种车辆起步阶段的离合器控制系统及方法,该系统包括电子控制单元以及PWM离合器单元；在车辆起步时,PWM离合器单元发送离合信号至电子控制单元；电子控制单元根据离合信号生成补偿扭矩；电子控制单元根据补偿扭矩和发动机储备扭矩生成目标扭矩,并通过目标扭矩调节发动机转速。本发明中,用PWM离合器单元替代离合开关,PWM离合器单元不仅能实现离合开关功能,还能在车辆起步过程中根据离合信号生成补偿扭矩,提前对发动机扭矩进行补偿,提升发动机转速,明显提升车辆起步性能,从而解决了现有离合开关在车辆起步时无法满足发动机扭矩,造成起步过程动力偏弱车辆容易熄火的技术问题。(The invention belongs to the technical field of vehicle clutches, and discloses a clutch control system and a method for a vehicle starting stage, wherein the system comprises an electronic control unit and a PWM clutch unit; when the vehicle starts, the PWM clutch unit sends a clutch signal to the electronic control unit; the electronic control unit generates compensation torque according to the clutch signal; the electronic control unit generates a target torque according to the compensation torque and the engine reserve torque, and adjusts the engine speed according to the target torque. According to the invention, the PWM clutch unit is used for replacing the clutch switch, the PWM clutch unit not only can realize the function of the clutch switch, but also can generate compensation torque according to a clutch signal in the starting process of the vehicle, so that the torque of an engine is compensated in advance, the rotating speed of the engine is increased, and the starting performance of the vehicle is obviously improved, thereby solving the technical problem that the existing clutch switch cannot meet the torque of the engine when the vehicle is started, and the vehicle with weak power is easy to stall in the starting process.)

1. The clutch control system at the vehicle starting stage is characterized by comprising an electronic control unit and a PWM clutch unit; wherein the content of the first and second substances,

the PWM clutch unit is used for sending a clutch signal to the electronic control unit when the vehicle starts;

the electronic control unit is used for generating compensation torque according to the clutch signal;

and the electronic control unit is also used for generating a target torque according to the compensation torque and the engine reserve torque and adjusting the engine speed according to the target torque.

2. The vehicle launch phase clutch control system of claim 1, wherein said PWM clutch unit includes a PWM clutch sensor; wherein the content of the first and second substances,

the PWM clutch sensor is characterized in that a PWM signal end of the PWM clutch sensor is connected with the electronic control unit, a clutch cylinder bottom signal end of the PWM clutch sensor is connected with the electronic control unit, a driving relay end of the PWM clutch sensor is connected with the electronic control unit, a power supply end of the PWM clutch sensor is connected with the electronic control unit, and a grounding end of the PWM clutch sensor is grounded.

3. The vehicle launch phase clutch control system of claim 2, wherein said PWM clutch unit further includes a PWM clutch signal circuit; wherein the content of the first and second substances,

the input end of the PWM clutch signal circuit is connected with the PWM clutch sensor, and the output end of the PWM clutch signal circuit is connected with the electronic control unit.

4. The clutch control system for a vehicle launch phase of claim 3 wherein the PWM clutch signal circuit includes a first resistor, a second resistor, and a third resistor; wherein the content of the first and second substances,

the power supply end of the PWM clutch sensor is connected with the electronic control unit, the PWM signal end of the PWM clutch sensor is connected with the first end of the first resistor, the first end of the first resistor is connected with the electronic control unit, and the second end of the first resistor is connected with the reference voltage end; the electronic control unit is characterized in that a clutch cylinder bottom signal end of the PWM clutch sensor is connected with a first end of a second resistor, the first end of the second resistor is connected with the electronic control unit, a second end of the second resistor is connected with a power supply end of the PWM clutch sensor, a driving relay end of the PWM clutch sensor is connected with a first end of a third resistor, the first end of the third resistor is connected with the electronic control unit, and the second end of the third resistor is connected with the power supply end of the PWM clutch sensor.

5. A clutch control system for a vehicle launch phase according to claim 1 wherein the electronic control unit includes a torque calculation module; wherein the content of the first and second substances,

the torque calculation module is used for acquiring engine combustion torque, engine internal friction torque and load torque when the vehicle is in an idle working condition;

the torque calculation module is further used for determining clutch output torque according to the engine combustion torque, the engine internal friction torque and the load torque;

the torque calculation module is further used for generating an engine reserve torque according to the clutch output torque and storing the engine reserve torque.

6. The vehicle launch stage clutch control system of claim 5, wherein said torque calculation module is further configured to calculate a clutch output torque based on said engine combustion torque, said engine internal friction torque, said load torque, and a clutch torque calculation formula;

the clutch torque calculation formula is as follows:

M_clutch＝M_cylinder-M_{friction-losses}-M_{external-loads}

wherein M is_clutchFor clutch output torque, M_cylinderFor engine combustion torque, M_{friction-losses}For internal friction of enginesTorque, M_{external-loads}Is the load torque.

7. The vehicle launch stage clutch control system of claim 6, wherein said electronic control unit further includes a signal determination module; wherein the content of the first and second substances,

the signal judgment module is used for determining expected torque according to the clutch signal and judging whether the reserved torque of the engine meets the expected torque;

the signal judgment module is further used for generating compensation torque according to the clutch signal when the reserved torque of the engine does not meet the expected torque.

8. A clutch control method for a vehicle starting stage is characterized by comprising the following steps:

when the vehicle starts, the PWM clutch unit sends a clutch signal to the electronic control unit;

the electronic control unit generates compensation torque according to the clutch signal;

and the electronic control unit generates a target torque according to the compensation torque and the engine reserve torque, and raises the rotating speed of the engine through the target torque to realize vehicle starting.

9. The clutch control method at a startup phase of a vehicle according to claim 8, wherein the electronic control unit includes a torque calculation module;

before the step that the PWM clutch unit sends the clutch signal to the electronic control unit when the vehicle starts, the method further comprises the following steps:

when the vehicle is in an idling working condition, the torque calculation module acquires engine combustion torque, engine internal friction torque and load torque;

the torque calculation module determines a clutch output torque based on the engine combustion torque, the engine internal friction torque, and the load torque;

the torque calculation module generates an engine reserve torque based on the clutch output torque and stores the engine reserve torque.

10. The method for controlling a clutch during a launch phase of a vehicle as claimed in claim 9, wherein said torque calculation module determines a clutch output torque based on said engine combustion torque, said engine internal friction torque and said load torque, and further comprising:

the torque calculation module is further used for calculating clutch output torque according to the engine combustion torque, the engine internal friction torque, the load torque and a clutch torque calculation formula;

the clutch torque calculation formula is as follows:

M_clutch＝M_cylinder-M_{friction-losses}-M_{external-loads}

wherein M is_clutchFor clutch output torque, M_cylinderFor engine combustion torque, M_{friction-losses}For internal friction torque of the engine, M_{external-loads}Is the load torque.

Technical Field

The invention relates to the technical field of vehicle clutches, in particular to a clutch control system and method for a vehicle starting stage.

Background

The manual transmission type under the current technical state is generally provided with a clutch switch, when a driver steps on a clutch pedal, a clutch signal is set, an engine management system receives the set clutch signal, and the vehicle is controlled to be in engine fuel cut-off, cruise quit and the like. By adopting a traditional common clutch switch, the load of an engine is gradually increased in the process of releasing the clutch of a vehicle starting driver, the torque of the engine at the moment is passively responded under the condition of not giving an accelerator, and the increased torque of the engine is provided by the reserved idle torque. The magnitude of the idle reserved torque and the response speed of the reserved torque influence the starting performance of the vehicle, and have important influence on the starting driving feeling of the vehicle.

In the process of starting by loosening the clutch, the engine management system cannot recognize the starting intention of a driver in advance and cannot actively supply engine torque, so that the power is weak in the starting process, the vehicle is easy to flameout, and the driving and riding feeling is influenced.

The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.

Disclosure of Invention

The invention mainly aims to provide a clutch control system and method for a vehicle in a starting stage, and aims to solve the technical problem that the existing clutch switch cannot meet the torque of an engine when the vehicle is started, so that the vehicle with weak power is easy to stall in the starting process.

In order to achieve the above object, the present invention provides a clutch control system for a vehicle start stage, which includes an electronic control unit and a PWM clutch unit; wherein the content of the first and second substances,

the PWM clutch unit is used for sending a clutch signal to the electronic control unit when the vehicle starts;

the electronic control unit is used for generating compensation torque according to the clutch signal;

and the electronic control unit is also used for generating a target torque according to the compensation torque and the engine reserve torque and adjusting the engine speed according to the target torque.

Optionally, the PWM clutch unit comprises a PWM clutch sensor; wherein the content of the first and second substances,

the PWM clutch sensor is characterized in that a PWM signal end of the PWM clutch sensor is connected with the electronic control unit, a clutch cylinder bottom signal end of the PWM clutch sensor is connected with the electronic control unit, a driving relay end of the PWM clutch sensor is connected with the electronic control unit, a power supply end of the PWM clutch sensor is connected with the electronic control unit, and a grounding end of the PWM clutch sensor is grounded.

Optionally, the PWM clutch unit further includes a PWM clutch signal circuit; wherein the content of the first and second substances,

the input end of the PWM clutch signal circuit is connected with the PWM clutch sensor, and the output end of the PWM clutch signal circuit is connected with the electronic control unit.

Optionally, the PWM clutch signal circuit includes a first resistor, a second resistor, and a third resistor; wherein the content of the first and second substances,

the power supply end of the PWM clutch sensor is connected with the electronic control unit, the PWM signal end of the PWM clutch sensor is connected with the first end of the first resistor, the first end of the first resistor is connected with the electronic control unit, and the second end of the first resistor is connected with the reference voltage end; the electronic control unit is characterized in that a clutch cylinder bottom signal end of the PWM clutch sensor is connected with a first end of a second resistor, the first end of the second resistor is connected with the electronic control unit, a second end of the second resistor is connected with a power supply end of the PWM clutch sensor, a driving relay end of the PWM clutch sensor is connected with a first end of a third resistor, the first end of the third resistor is connected with the electronic control unit, and the second end of the third resistor is connected with the power supply end of the PWM clutch sensor.

Optionally, the electronic control unit comprises a torque calculation module; wherein the content of the first and second substances,

the torque calculation module is used for acquiring engine combustion torque, engine internal friction torque and load torque when the vehicle is in an idle working condition;

the torque calculation module is further used for determining clutch output torque according to the engine combustion torque, the engine internal friction torque and the load torque;

the torque calculation module is further used for generating an engine reserve torque according to the clutch output torque and storing the engine reserve torque.

Optionally, the torque calculation module is further configured to calculate a clutch output torque according to the engine combustion torque, the engine internal friction torque, the load torque, and a clutch torque calculation formula;

the clutch torque calculation formula is as follows:

M_clutch＝M_cylinder-M_{friction-losses}-M_{external-loads}

wherein M is_clutchFor clutch output torque, M_cylinderFor engine combustion torque, M_{friction-losses}To startInternal friction torque of the machine, M_{external-loads}Is the load torque.

Optionally, the electronic control unit further includes a signal judgment module; wherein the content of the first and second substances,

the signal judgment module is used for determining expected torque according to the clutch signal and judging whether the reserved torque of the engine meets the expected torque;

the signal judgment module is further used for generating compensation torque according to the clutch signal when the reserved torque of the engine does not meet the expected torque.

In order to achieve the above object, the present invention further provides a clutch control method for a vehicle start stage, including:

when the vehicle starts, the PWM clutch unit sends a clutch signal to the electronic control unit;

the electronic control unit generates compensation torque according to the clutch signal;

and the electronic control unit generates a target torque according to the compensation torque and the engine reserve torque, and raises the rotating speed of the engine through the target torque to realize vehicle starting.

Optionally, the electronic control unit comprises a torque calculation module;

before the step that the PWM clutch unit sends the clutch signal to the electronic control unit when the vehicle starts, the method further comprises the following steps:

when the vehicle is in an idling working condition, the torque calculation module acquires engine combustion torque, engine internal friction torque and load torque;

the torque calculation module determines a clutch output torque based on the engine combustion torque, the engine internal friction torque, and the load torque;

the torque calculation module generates an engine reserve torque based on the clutch output torque and stores the engine reserve torque.

Optionally, the step of determining the clutch output torque by the torque calculation module according to the engine combustion torque, the engine internal friction torque and the load torque specifically includes:

the torque calculation module is further used for calculating clutch output torque according to the engine combustion torque, the engine internal friction torque, the load torque and a clutch torque calculation formula;

the clutch torque calculation formula is as follows:

M_clutch＝M_cylinder-M_{friction-losses}-M_{external-loads}

wherein M is_clutchFor clutch output torque, M_cylinderFor engine combustion torque, M_{friction-losses}For internal friction torque of the engine, M_{external-loads}Is the load torque.

The invention provides a clutch control system at a vehicle starting stage, which comprises an electronic control unit and a PWM clutch unit, wherein the electronic control unit is connected with the PWM clutch unit; the PWM clutch unit is used for sending a clutch signal to the electronic control unit when the vehicle starts; the electronic control unit is used for generating compensation torque according to the clutch signal; and the electronic control unit is also used for generating a target torque according to the compensation torque and the engine reserve torque and adjusting the engine speed according to the target torque. Through the mode, the PWM clutch unit is used for replacing the clutch switch, the PWM clutch unit not only can realize the function of the clutch switch, but also can generate compensation torque according to clutch signals in the vehicle starting process, compensate the engine torque in advance, improve the engine rotating speed and obviously improve the vehicle starting performance, so that the technical problem that the existing clutch switch cannot meet the engine torque when the vehicle is started, and the vehicle is easy to flameout due to weak power in the starting process is solved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.

It is to be understood that the drawings in the following description are merely exemplary of the invention and that other drawings may be derived from the structure shown in the drawings by those skilled in the art without the exercise of inventive faculty.

FIG. 1 is a functional block schematic diagram of an embodiment of a clutch control system for a vehicle launch phase of the present invention;

FIG. 2 is a schematic diagram of a PWM clutch sensor of an embodiment of the clutch control system of the present invention during a launch phase of a vehicle;

FIG. 3 is a schematic diagram of a PWM clutch signal circuit of an embodiment of the clutch control system in the vehicle starting stage;

FIG. 4 is a schematic flow chart diagram illustrating a first embodiment of a method for controlling a clutch during a launch phase of a vehicle according to the present invention;

fig. 5 is a flowchart illustrating a clutch control method for a vehicle at a start stage according to a second embodiment of the present invention.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				100	Electronic control unit	CBS2	Drive relay terminal
200	PWM clutch unit	Vsup	Power supply terminal
				201	PWM clutch sensor	GND	Grounding terminal
CTS	PWM signal terminal	202	PWM clutch signal circuit
				CBS1	Clutch cylinder bottom signal end	R1～R3	First to third resistors

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The invention provides a clutch control system for a vehicle in a starting stage.

Referring to fig. 1, in the embodiment of the present invention, the clutch control system in the vehicle starting stage includes an electronic control unit 100 and a PWM clutch unit 200; wherein the content of the first and second substances,

the PWM clutch unit 200 is configured to send a clutch signal to the electronic control unit 100 when the vehicle starts. In this embodiment, the PWM clutch unit 200 may include a PWM clutch sensor, wherein the PWM clutch sensor may include five pins, which are a PWM signal terminal, a clutch cylinder bottom signal terminal, a driving relay terminal, a power supply terminal, and a ground terminal, respectively, the PWM signal terminal of the PWM clutch sensor is connected to the electronic control unit 100, the clutch cylinder bottom signal terminal of the PWM clutch sensor is connected to the electronic control unit 100, the driving relay terminal of the PWM clutch sensor is connected to the electronic control unit 100, the power supply terminal of the PWM clutch sensor is connected to the electronic control unit 100, and the ground terminal of the PWM clutch sensor is grounded. Specifically, the PWM clutch sensor can reflect the clutch signal of the whole process of the clutch stepping and releasing of the driver when the vehicle starts.

The electronic control unit 100 is configured to generate a compensation torque according to the clutch signal. In this embodiment, the Electronic Control Unit 100 may be an engine management Unit (ECU); the clutch switch is replaced by the PWM clutch sensor, the external shape structure of the PWM clutch sensor is the same as that of the clutch switch, and the electronic control unit 100 generates the compensation torque according to the clutch signal when the vehicle starts.

The electronic control unit 100 is further configured to generate a target torque according to the compensation torque and the engine reserve torque, and adjust the engine speed according to the target torque.

In this embodiment, the electronic control unit 100 generates a compensation torque according to the clutch signal, generates a target torque according to the compensation torque and the engine reserve torque, adjusts the engine speed according to the target torque, and increases the engine torque to increase the engine speed according to the target torque before the clutch is coupled to the engine flywheel, thereby improving the vehicle starting performance.

Specifically, the electronic control unit 100 may include a torque calculation module; the torque calculation module is used for acquiring engine combustion torque, engine internal friction torque and load torque when a vehicle is in an idle working condition; the torque calculation module is further used for determining clutch output torque according to the engine combustion torque, the engine internal friction torque and the load torque; the torque calculation module is further used for generating an engine reserve torque according to the clutch output torque and storing the engine reserve torque.

The embodiment provides a clutch control system for a vehicle starting stage, which comprises an electronic control unit 100 and a PWM clutch unit 200; the PWM clutch unit 200 is configured to send a clutch signal to the electronic control unit 100 when the vehicle starts; the electronic control unit 100 is used for generating compensation torque according to the clutch signal; the electronic control unit 100 is further configured to generate a target torque according to the compensation torque and the engine reserve torque, and adjust the engine speed according to the target torque. Through the mode, the PWM clutch unit is used for replacing the clutch switch, the PWM clutch unit not only can realize the function of the clutch switch, but also can generate compensation torque according to clutch signals in the vehicle starting process, compensate the engine torque in advance, improve the engine rotating speed and obviously improve the vehicle starting performance, so that the technical problem that the existing clutch switch cannot meet the engine torque when the vehicle is started, and the vehicle is easy to flameout due to weak power in the starting process is solved.

Further, referring to fig. 2, the PWM clutch unit 200 includes a PWM clutch sensor 201; wherein the content of the first and second substances,

a PWM signal terminal CTS of the PWM clutch sensor 201 is connected to the electronic control unit 100, a clutch cylinder bottom signal terminal CBS1 of the PWM clutch sensor 201 is connected to the electronic control unit 100, a driving relay terminal CBS2 of the PWM clutch sensor 201 is connected to the electronic control unit 100, and a power supply terminal V of the PWM clutch sensor 201_supThe ground terminal GND of the PWM clutch sensor 201 is grounded, and is connected to the electronic control unit 100.

It should be noted that the PWM clutch unit 200 may include a PWM clutch sensor 201, wherein the PWM clutch sensor 201 may include five pins, which are a PWM signal terminal CTS, a clutch cylinder bottom signal terminal CBS1, a driving relay terminal CBS2, and a power supply terminal V, respectively_supAnd a ground terminal GND.

Further, referring to fig. 3, the PWM clutch unit 200 further includes a PWM clutch signal circuit 202; wherein the content of the first and second substances,

the input end of the PWM clutch signal circuit 202 is connected to the PWM clutch sensor 201, and the output end of the PWM clutch signal circuit 202 is connected to the electronic control unit 100.

It should be noted that the sensor circuit of the PWM clutch sensor 201 may include a resistor capacitor, a diode, a zener diode, a MOS transistor, etc., in this embodiment, the PWM clutch sensor 201 is connected to the electronic control unit 100, and the interface circuit between the PWM clutch sensor 201 and the electronic control unit 100 is the PWM clutch signal circuit 202. The PWM clutch signal circuit 202 may include a first resistor R1, a second resistor R2, a third resistor R3, and the like.

Further, referring to fig. 3, the PWM clutch signal circuit 202 includes a first resistor R1, a second resistor R2, and a third resistor R3; wherein the content of the first and second substances,

power supply end V of PWM clutch sensor 201_supThe PWM signal terminal CTS of the PWM clutch sensor 201 is connected to the first terminal of the first resistor R1, the first terminal of the first resistor R1 is connected to the electronic control unit 100, and the second terminal of the first resistor R1 is connected to the reference voltage terminal Vref; a clutch bottom signal end CBS1 of the PWM clutch sensor 201 is connected to a first end of the second resistor R2, a first end of the second resistor R2 is connected to the electronic control unit 100, and a second end of the second resistor R2 is connected to a power supply terminal V of the PWM clutch sensor 201_supThe drive relay terminal CBS2 of the PWM clutch sensor 201 is connected to the first terminal of the third resistor R3, the first terminal of the third resistor R3 is connected to the ecu 100, and the second terminal of the third resistor R3 is connected to the power supply terminal V of the PWM clutch sensor 201_supAnd (4) connecting.

It should be noted that the interface circuit between the PWM clutch sensor 201 and the electronic control unit 100 is a PWM clutch signal circuit 202, the PWM clutch signal circuit 202 may include a first resistor R1, a second resistor R2, and a third resistor R3, and the PWM clutch signal circuit 202 may further include other components according to actual situations, which is not limited in this embodiment.

Further, the electronic control unit 100 includes a torque calculation module; wherein the content of the first and second substances,

the torque calculation module is used for acquiring engine combustion torque, engine internal friction torque and load torque when the vehicle is in an idle working condition;

the torque calculation module is further used for determining clutch output torque according to the engine combustion torque, the engine internal friction torque and the load torque;

the torque calculation module is further used for generating an engine reserve torque according to the clutch output torque and storing the engine reserve torque.

It should be noted that the electronic control unit 100 may include a torque calculation module (not shown), before the engine is started, the vehicle is in an idle condition, and the output torque of the engine during the idle operation is only used for overcoming the internal friction resistance of the engine and the external load torque, where the engine combustion torque is a result of the mutual influence of the intake air amount of the engine, the air-fuel mixture in the cylinder, and the actual ignition angle.

Further, the torque calculation module is further used for calculating clutch output torque according to the engine combustion torque, the engine internal friction torque, the load torque and a clutch torque calculation formula;

the clutch torque calculation formula is as follows:

M_clutch＝M_cylinder-M_{friction-losses}-M_{external-loads}

wherein M is_clutchFor clutch output torque, M_cylinderFor engine combustion torque, M_{friction-losses}For internal friction torque of the engine, M_{external-loads}Is the load torque.

Note that, when the engine is in an idle condition and the vehicle is not required to be driven, the torque on the clutch side should be 0. The torque produced by the engine is all used to overcome the internal friction resistance of the engine and the external load torque. When the torque on the engine clutch side is not 0, the engine speed fluctuates. The aim of idle speed control is to keep the combustion torque and the consumption torque of the engine balanced and maintain the stable operation of the engine by continuously adjusting the opening of a throttle body, the fuel injection quantity and the ignition angle.

Further, the electronic control unit 100 further includes a signal judgment module; wherein the content of the first and second substances,

the signal judgment module is used for determining expected torque according to the clutch signal and judging whether the reserved torque of the engine meets the expected torque;

the signal judgment module is further used for generating compensation torque according to the clutch signal when the reserved torque of the engine does not meet the expected torque.

It should be noted that, the electronic control unit 100 may further include a signal determining module (not shown), and for a vehicle not matched with the PWM clutch unit 200, during a process of releasing the clutch pedal when the vehicle starts, the vehicle load is gradually increased, and at this time, the compensation torque source is mainly the engine reserve torque in the idle condition. When starting, the engine reserve torque is consumed quickly, and when the actual torque is equal to the engine reserve torque, the torque can not be provided quickly through the ignition angle. At take-off, the driver request torque is typically higher than the base torque, and the output firing angle is the same as the base firing angle. A larger engine reserve torque will result in a larger spark angle retard, which will result in a significantly higher exhaust temperature and fuel consumption than normal idle, so the engine reserve torque should not be too large. If the vehicle is on a slope when starting, or the starting resistance is larger due to the dispersion of the vehicle, when the torque is not supplied timely or the reserved torque of the engine is insufficient, the vehicle is easy to flameout, shake and the like, the driving feeling is influenced, and the potential safety hazard is also caused.

It is easy to understand that the signal judgment module is used for determining the expected torque according to the clutch signal and judging whether the reserved torque of the engine meets the expected torque; the signal judgment module is further used for generating compensation torque according to the clutch signal when the reserved torque of the engine does not meet the expected torque. Specifically, when the vehicle is matched with the PWM-type clutch sensor, the electronic control unit 100 additionally increases the compensation torque in addition to the engine reserve torque according to the clutch signal, and simultaneously increases the engine speed, when the clutch signal of the PWM clutch unit 200 starts to increase from 0, the engine intake air amount starts to increase, as the clutch signal increases gradually, the ignition angle also increases, the engine speed and the torque increase, the vehicle speed starts to increase from 0, the vehicle start is completed, and when the clutch is completely released, the engine intake air amount and the ignition angle are nearly restored to the pre-start state.

In addition, an embodiment of the present invention further provides a clutch control method in a vehicle starting stage, referring to fig. 4, and fig. 4 is a flowchart illustrating a first embodiment of the clutch control method in the vehicle starting stage according to the present invention.

In this embodiment, the clutch control method in the vehicle starting stage includes the following steps:

step S10: when the vehicle starts, the PWM clutch unit sends a clutch signal to the electronic control unit.

It should be noted that, the PWM clutch unit may include a PWM clutch sensor, where the PWM clutch sensor may include five pins, which are a PWM signal end, a clutch cylinder bottom signal end, a driving relay end, a power supply end, and a ground end, respectively, the PWM signal end of the PWM clutch sensor is connected to the electronic control unit, the clutch cylinder bottom signal end of the PWM clutch sensor is connected to the electronic control unit, the driving relay end of the PWM clutch sensor is connected to the electronic control unit, the power supply end of the PWM clutch sensor is connected to the electronic control unit, and the ground end of the PWM clutch sensor is grounded. Specifically, the PWM clutch sensor can reflect the clutch signal of the whole process of the clutch stepping and releasing of the driver when the vehicle starts.

Step S20: the electronic control unit generates compensation torque according to the clutch signal.

It is easily understood that the Electronic control unit may be an engine management unit (ECU); and replacing the clutch switch with the PWM clutch sensor, wherein the appearance structure of the PWM clutch sensor is the same as that of the clutch switch, and the electronic control unit generates compensation torque according to the clutch signal when the vehicle starts.

Step S30: and the electronic control unit generates a target torque according to the compensation torque and the engine reserve torque, and raises the rotating speed of the engine through the target torque to realize vehicle starting.

The electronic control unit generates a compensation torque according to the clutch signal, generates a target torque according to the compensation torque and the engine reserve torque, adjusts the engine speed according to the target torque, and increases the engine torque to increase the engine speed according to the target torque before the clutch is combined with the engine flywheel, so that the vehicle starting performance is improved.

In particular, the electronic control unit may comprise a torque calculation module; the torque calculation module is used for acquiring engine combustion torque, engine internal friction torque and load torque when a vehicle is in an idle working condition; the torque calculation module is further used for determining clutch output torque according to the engine combustion torque, the engine internal friction torque and the load torque; the torque calculation module is further used for generating an engine reserve torque according to the clutch output torque and storing the engine reserve torque.

In the embodiment, when the vehicle starts, the PWM clutch unit sends a clutch signal to the electronic control unit; the electronic control unit generates compensation torque according to the clutch signal; and the electronic control unit generates a target torque according to the compensation torque and the engine reserve torque, and raises the rotating speed of the engine through the target torque to realize vehicle starting. Through the mode, the PWM clutch unit is used for replacing the clutch switch, the PWM clutch unit not only can realize the function of the clutch switch, but also can generate compensation torque according to clutch signals in the vehicle starting process, compensate the engine torque in advance, improve the engine rotating speed and obviously improve the vehicle starting performance, so that the technical problem that the existing clutch switch cannot meet the engine torque when the vehicle is started, and the vehicle is easy to flameout due to weak power in the starting process is solved.

Referring to fig. 5, fig. 5 is a flowchart illustrating a clutch control method for a vehicle at a vehicle launch stage according to a second embodiment of the present invention. Based on the first embodiment described above, the electronic control unit includes a torque calculation module; the clutch control method in the vehicle starting stage according to the embodiment further includes, before the step S10:

step S101: the torque calculation module obtains an engine combustion torque, an engine internal friction torque, and a load torque when the vehicle is in an idle condition.

It should be noted that the electronic control unit may include a torque calculation module; the torque calculation module obtains an engine combustion torque, an engine internal friction torque, and a load torque when the vehicle is in an idle condition. The torque calculation module determines a clutch output torque based on the engine combustion torque, the engine internal friction torque, and the load torque.

It is easy to understand that before starting, the vehicle is in an idle working condition, the output torque of the engine during the idle working is only used for overcoming the internal friction resistance of the engine and the external load torque, and the combustion torque of the engine at the moment is the result of the mutual influence of the air intake quantity of the engine, the air-fuel mixture in the cylinder and the actual ignition angle. When the engine is in idle and not required to drive the vehicle, the clutch-side torque should be 0. The torque produced by the engine is all used to overcome the internal friction resistance of the engine and the external load torque. When the torque on the engine clutch side is not 0, the engine speed fluctuates. The aim of idle speed control is to keep the combustion torque and the consumption torque of the engine balanced and maintain the stable operation of the engine by continuously adjusting the opening of a throttle body, the fuel injection quantity and the ignition angle.

Step S102: the torque calculation module determines a clutch output torque based on the engine combustion torque, the engine internal friction torque, and the load torque.

It is easy to understand that the step of determining the clutch output torque according to the engine combustion torque, the engine internal friction torque and the load torque by the torque calculation module specifically comprises the following steps: the torque calculation module is further used for calculating clutch output torque according to the engine combustion torque, the engine internal friction torque, the load torque and a clutch torque calculation formula;

the clutch torque calculation formula is as follows:

M_clutch＝M_cylinder-M_{friction-losses}-M_{external-loads}

wherein M is_clutchFor clutch output torque, M_cylinderFor engine combustion torque, M_{friction-losses}For internal friction torque of the engine, M_{external-loads}Is the load torque.

Step S103: the torque calculation module generates an engine reserve torque based on the clutch output torque and stores the engine reserve torque.

The torque calculation module generates an engine reserve torque based on the clutch output torque and stores the engine reserve torque. The electronic control unit can further comprise a signal judgment module, wherein the signal judgment module is used for determining expected torque according to the clutch signal and judging whether the reserved torque of the engine meets the expected torque; the signal judgment module is further used for generating compensation torque according to the clutch signal when the reserved torque of the engine does not meet the expected torque.

It will be readily appreciated that for vehicles not fitted with a PWM clutch unit, the vehicle load increases progressively during the vehicle launch to release the clutch pedal, where the source of the compensating torque is primarily engine reserve torque at idle. When starting, the engine reserve torque is consumed quickly, and when the actual torque is equal to the engine reserve torque, the torque can not be provided quickly through the ignition angle. At take-off, the driver request torque is typically higher than the base torque, and the output firing angle is the same as the base firing angle. A larger engine reserve torque will result in a larger spark angle retard, which will result in a significantly higher exhaust temperature and fuel consumption than normal idle, so the engine reserve torque should not be too large. If the vehicle is on a slope when starting, or the starting resistance is larger due to the dispersion of the vehicle, when the torque is not supplied timely or the reserved torque of the engine is insufficient, the vehicle is easy to flameout, shake and the like, the driving feeling is influenced, and the potential safety hazard is also caused.

Specifically, when the vehicle is matched with the PWM clutch sensor, the electronic control unit additionally increases compensation torque besides the reserved torque of the engine according to the clutch signal and simultaneously increases the rotating speed of the engine, when the clutch signal of the PWM clutch unit starts to increase from 0, the air inflow of the engine starts to increase, as the clutch signal gradually increases, the ignition angle also increases, the rotating speed and the torque of the engine rise, the vehicle speed starts to increase from 0, the vehicle starting is completed, and when the clutch is completely released, the air inflow and the ignition angle of the engine are approximately recovered to the state before the vehicle starting.

In the embodiment, when the vehicle is in an idle working condition, the torque calculation module acquires engine combustion torque, engine internal friction torque and load torque; the torque calculation module determines a clutch output torque based on the engine combustion torque, the engine internal friction torque, and the load torque; the torque calculation module generates an engine reserve torque based on the clutch output torque and stores the engine reserve torque. Through the mode, when the vehicle is in an idling working condition, the reserved torque of the engine is stored, the PWM clutch unit is used for replacing the clutch switch, the PWM clutch unit not only can realize the function of the clutch switch, but also can generate compensation torque according to a clutch signal in the starting process of the vehicle, the torque of the engine is compensated in advance according to the reserved torque of the engine and the compensation torque, the rotating speed of the engine is improved, and the starting performance of the vehicle is obviously improved, so that the technical problem that the existing clutch switch cannot meet the torque of the engine when the vehicle is started, and the vehicle with weak power is easy to stall in the starting process is solved.

It should be understood that the above is only an example, and the technical solution of the present invention is not limited in any way, and in a specific application, a person skilled in the art may set the technical solution as needed, and the present invention is not limited thereto.

It should be noted that the above-described work flows are only exemplary, and do not limit the scope of the present invention, and in practical applications, a person skilled in the art may select some or all of them to achieve the purpose of the solution of the embodiment according to actual needs, and the present invention is not limited herein.

In addition, the technical details that are not described in detail in this embodiment may be referred to a clutch control method for a vehicle start stage provided in any embodiment of the present invention, and are not described herein again.

Further, it is to be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.

The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention or portions thereof that contribute to the prior art may be embodied in the form of a software product, where the computer software product is stored in a storage medium (e.g. Read Only Memory (ROM)/RAM, magnetic disk, optical disk), and includes several instructions for enabling a terminal device (e.g. a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.