CN111237359A

CN111237359A - Intelligent clutch control system and control method

Info

Publication number: CN111237359A
Application number: CN202010074632.8A
Authority: CN
Inventors: 赵琼; 熊春英; 金文辉; 李小军; 丁文敏; 刘淑英; 骆旭薇; 乔虹; 易忠新; 杜天义; 徐梓峰; 夏能银
Original assignee: Jiangling Motors Corp Ltd
Current assignee: Jiangling Motors Corp Ltd
Priority date: 2020-01-22
Filing date: 2020-01-22
Publication date: 2020-06-05

Abstract

The invention relates to an intelligent clutch control system and a control method, wherein the intelligent clutch control system comprises an ICS (integrated control system) electric control unit, a gear selecting and shifting position sensor, a gear shifting intention sensor, a clutch control mechanism, a clutch position sensor and an electronic throttle valve, wherein the clutch position sensor, the gear selecting and shifting position sensor and the gear shifting intention sensor are all connected with the input end of the ICS electric control unit, and the clutch control mechanism is connected with the output end of the ICS electric control unit; the output end of the clutch control mechanism is connected with the clutch, the input ends of the gear shifting position selecting sensor and the gear shifting intention sensor are connected with the output end of the transmission, and the output end of the ICS electronic control unit is connected with the clutch control mechanism; the input end of the electronic throttle valve is connected with an accelerator pedal, and the output end of the electronic throttle valve is connected with the engine. The intelligent clutch control system provided by the invention can enable the vehicle to start more stably and shift more smoothly.

Description

Intelligent clutch control system and control method

Technical Field

The invention relates to the technical field of automobile control, in particular to an intelligent clutch control system and a self-learning method of the intelligent clutch control system.

Background

With the increase of the quantity of automobiles kept in China, the urban vehicle congestion situation is more and more serious. On congested road conditions, especially for light truck vehicles with manual gears, the driver needs to control the clutch pedal in a tedious manner so as to bring about poor operation experience.

For this reason, some customers select the light card with AMT function, however, the cost performance of this kind of motorcycle type is not high, often lets people go with a hurry. Therefore, an intelligent clutch control system is a better approach to solve the above problems. For an Intelligent Clutch System (ICS for short), the Intelligent Clutch System generally includes the following features: (1) partial functions of the AMT can be realized, and convenient operation is brought to customers; namely, a clutch pedal is cancelled on the traditional MT vehicle type, and an electronic intelligent control system and an electromechanical hydraulic actuating mechanism are added; the clutch is disengaged and engaged according to the driver's intention to shift. The left foot is liberated while the driving pleasure is kept under various working conditions of the vehicle. (2) The intelligent clutch system can save fuel oil: the intelligent clutch system achieves the purpose of saving oil by intelligently controlling the clutch, ensures comfortable starting, crawling and gear shifting, and saves oil by at least 5% under urban working conditions; (3) the frequent clonk problem of the back-drive is optimized by reasonably controlling the rotating speed increasing rate and the increasing amount of the downshift engine and intervening the EMS torque increasing rate; (4) the electrification degree of the MT vehicle type is improved, the information network integration of the MT vehicle type is realized, and a foundation is laid for the application of the MT vehicle type hybrid technology.

However, in the prior art, the problems that part of intelligent clutch systems are not stable enough during starting and not smooth enough during gear shifting still exist, and the experience of drivers and passengers is influenced.

Disclosure of Invention

Based on the above, the invention aims to solve the problems that in the prior art, the experience of drivers and passengers is influenced by the problems that part of intelligent clutch systems are still unstable during starting and are not smooth during gear shifting.

The invention provides an intelligent clutch control system, which comprises an ICS (integrated control system) electronic control unit, a gear selecting and shifting position sensor, a gear shifting intention sensor, a clutch control mechanism, a clutch position sensor and an electronic throttle valve, wherein the ICS electronic control unit is connected with the gear selecting and shifting position sensor;

wherein the clutch position sensor, the gear selection and shift position sensor and the gear shift intention sensor are all connected with the input end of the ICS electronic control unit, and the clutch control mechanism is connected with the output end of the ICS electronic control unit;

the output end of the clutch control mechanism is connected with a clutch, the input ends of the gear selecting and shifting position sensor and the gear shifting intention sensor are connected with the output end of a transmission, and the output end of the ICS electronic control unit is connected with the clutch control mechanism;

the input end of the electronic throttle valve is connected with an accelerator pedal, the output end of the electronic throttle valve is connected with an engine, and the electronic throttle valve and the ICS electronic control unit receive and send data through a CAN network;

the ICS electronic control unit is used for calculating a target separation speed and a target combination speed corresponding to the closed-loop control of the starting rotating speed of the automobile according to the acquired current vehicle working condition information, calculating a target speed of the automobile during gear shifting combination, and correspondingly controlling the vehicle to perform clutch switching according to the target separation speed, the target combination speed and the target speed, wherein the current vehicle working condition information at least comprises a reference speed, an engine rotating speed, an engine torque and an accelerator opening degree.

The intelligent clutch control system comprises an ICS (integrated control system) electronic control unit, a gear selecting and shifting position sensor, a gear shifting intention sensor, a clutch operating mechanism, a clutch position sensor and an electronic throttle valve.

The intelligent clutch control system is characterized in that when the current engine speed is judged to be less than the difference value between the target engine speed and the engine speed threshold value, the target separation speed is set to be a calibration separation speed, wherein the calibration separation speed is an artificial preset calibration value.

The intelligent clutch control system is characterized in that when the current engine speed is judged to be greater than the sum of the target engine speed and the engine speed threshold, the target combination speed is calculated according to the current vehicle working condition information;

wherein the formula of the target binding speed is:

the target combination speed is the reference speed, the flywheel end speed difference and the speed difference coefficient, the rotating speed increasing rate and the rotating speed increasing rate coefficient and the speed deviation correction value.

The intelligent clutch control system is characterized in that when the automobile is in an upshift state during gear shifting combination, the target speed is calculated according to the formula:

the target speed is a reference speed-position correction value + flywheel end speed difference + speed difference coefficient + rotation speed rising rate + accelerator pedal position + accelerator pedal correction coefficient + speed offset correction value.

The intelligent clutch control system is characterized in that when the automobile is in a downshift state during gear shifting combination, the calculation formula of the target speed is as follows:

the target speed is the reference speed-position correction + flywheel end speed difference + downshift correction factor + rotation speed rate of rise + accelerator pedal position + accelerator pedal correction factor + speed downshift correction value.

The invention also provides a control method of the intelligent clutch control system, wherein the intelligent clutch control system comprises an ICS (integrated control system) electronic control unit, a gear selecting and shifting position sensor, a gear shifting intention sensor, a clutch operating mechanism, a clutch position sensor and an electronic throttle valve, and the method comprises the following steps:

acquiring current vehicle working condition information of an automobile, wherein the current vehicle working condition information at least comprises a reference speed, an engine rotating speed, an engine torque and an accelerator opening;

calculating to obtain a target separation speed and a target combination speed corresponding to the closed-loop control of the automobile starting rotating speed according to the current vehicle working condition information, and calculating to obtain a target speed of the automobile during gear shifting combination;

and correspondingly controlling the vehicle to perform clutch switching according to the target separation speed, the target combination speed and the target speed.

The control method of the intelligent clutch control system comprises the steps that when the current engine rotating speed is judged to be smaller than the difference value between the target engine rotating speed and the engine rotating speed threshold value, the target separation speed is set to be a calibration separation speed, wherein the calibration separation speed is an artificial preset calibration value;

when the current engine rotating speed is judged to be greater than the sum of the target engine rotating speed and the engine rotating speed threshold value, calculating to obtain the target combination speed according to the current vehicle working condition information;

wherein the formula of the target binding speed is:

The control method of the intelligent clutch control system comprises the following steps that when the automobile is in an upshift state during gear shifting combination, the calculation formula of the target speed is as follows:

the method comprises the steps that a target speed is a reference speed-position correction value + flywheel end speed difference coefficient + rotating speed rising rate coefficient + accelerator pedal position accelerator pedal correction coefficient + speed deviation correction value;

when the automobile is in a downshift state in the gear shifting combination, the calculation formula of the target speed is as follows:

The control method of the intelligent clutch control system comprises the following steps:

when the gear shifting action is detected, judging whether a new gear signal is received or not;

if so, judging whether the current engine rotating speed is greater than the engine rotating speed corresponding to the gear speed;

and if not, controlling the current engine rotating speed to be reduced so as to apply the rotational inertia of the engine to the automobile wheels.

when the automobile is judged to be in a gear state, judging whether the opening degree of a throttle valve of the automobile is zero or not;

if so, judging whether the current speed of the automobile is more than or equal to 5 km/h;

when the current speed of the automobile is judged to be more than or equal to 5km/h, judging whether the position of the clutch is smaller than a target crawling value or not;

if yes, the engine torque is raised to 30 N.m.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is a schematic structural diagram of an intelligent clutch control system according to a first embodiment of the present invention;

fig. 2 is a flowchart of a control method of an intelligent clutch control system according to a second embodiment of the invention;

FIG. 3 is a diagram illustrating a crawling operation when manual control logic is input according to a second embodiment of the present invention;

FIG. 4 is a schematic diagram of data of crawling condition collected by a real vehicle according to a second embodiment of the present invention;

FIG. 5 is a control diagram illustrating gear shifting according to a second embodiment of the present invention;

FIG. 6 is a diagram illustrating operating condition data during gear shifting according to a second embodiment of the present invention;

FIG. 7 is a flowchart of fuel saving control in the second embodiment of the present invention;

FIG. 8 is a schematic view of a fuel saving curve according to a second embodiment of the present invention;

FIG. 9 is a flow chart of the optimized automobile knocking process according to the third embodiment of the present invention.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In the prior art, the problems that part of intelligent clutch systems are not stable enough during starting and not smooth enough during gear shifting still exist, and the experience of drivers and passengers is influenced.

The first embodiment is as follows:

to solve the technical problem, the present invention provides an intelligent clutch control system, please refer to fig. 1, and the intelligent clutch control system according to the first embodiment of the present invention includes an ICS electronic control unit, a gear selecting and shifting position sensor, a gear shifting intention sensor, a clutch operating mechanism, a clutch position sensor, and an electronic throttle.

The clutch position sensor, the gear selecting and shifting position sensor and the gear shifting intention sensor are all connected with the input end of the ICS electronic control unit, and the clutch control mechanism is connected with the output end of the ICS electronic control unit.

It can also be seen from fig. 1 that the output of the clutch operating mechanism described above is connected to the clutch, that the inputs of the gear selection position sensor and of the gear change intention sensor are connected to the output of the transmission, and that the output of the ICS electronic control unit is connected to said clutch operating mechanism.

In fig. 1, the input end of the electronic throttle valve is connected to an accelerator pedal, the output end of the electronic throttle valve is connected to an engine, and the electronic throttle valve and the ICS electronic control unit both receive and transmit data through a CAN network.

The ICS electronic control unit is used for calculating a target separation speed and a target combination speed corresponding to the closed-loop control of the starting rotating speed of the automobile according to the acquired current vehicle working condition information, calculating a target speed when the automobile is subjected to gear shifting combination, and correspondingly controlling the vehicle to perform clutch switching according to the target separation speed, the target combination speed and the target speed, wherein the current vehicle working condition information at least comprises a reference speed, an engine rotating speed, an engine torque and an accelerator opening degree.

It should be noted here that, for the condition of the closed-loop control of the vehicle starting speed, two situations are included:

(1) and when the current engine rotating speed is judged to be less than the difference value between the target engine rotating speed and the engine rotating speed threshold value, setting the target separation speed as a calibration separation speed, wherein the calibration separation speed is an artificial preset calibration value.

(2) And when the current engine rotating speed is judged to be greater than the sum of the target engine rotating speed and the engine rotating speed threshold value, calculating to obtain the target combination speed according to the current vehicle working condition information.

Specifically, the formula of the target binding speed is as follows:

In addition, for the combined shift conditions, two situations are also included:

(1) in the upshift condition of the vehicle during the gear shifting engagement, the target speed is calculated by the formula:

(2) In a downshift condition when the vehicle is engaged in a gear shift, the target speed is calculated by the formula:

In the embodiment, the electronic control unit ICU reads partial CAN signals (engine speed, vehicle speed, accelerator opening, brake signals, water temperature signals and the like) of the vehicle ECU, the running condition of the vehicle is judged in real time, the gear shifting intention of a driver is identified through the gear selecting and shifting sensor, an ICS actuating mechanism (ICS electronic control unit) is driven to separate the clutch, the running speed and the position of the ICS actuating mechanism are subjected to closed-loop control, and the clutch is quickly and stably combined to ensure that the vehicle meets the operation comfort of the driver under various working conditions, the left foot CAN be thoroughly liberated, the driving fatigue strength and the driving skill are greatly reduced, and the driving pleasure is kept.

Example two:

the following describes in more detail a specific embodiment of the present invention by way of a specific example. Referring to fig. 2 to 8, a control method of an intelligent clutch control system according to a second embodiment of the present invention includes the following steps:

s101, obtaining current vehicle working condition information of the automobile, wherein the current vehicle working condition information at least comprises a reference speed, an engine rotating speed, an engine torque and an accelerator opening degree.

And S102, calculating to obtain a target separation speed and a target combination speed corresponding to the closed-loop control of the starting rotating speed of the automobile according to the current vehicle working condition information, and calculating to obtain a target speed of the automobile during gear shifting combination.

For the condition of closed-loop control of the starting speed of the automobile, two conditions are included:

Specifically, the formula of the target binding speed is as follows:

And S103, correspondingly controlling the vehicle to perform clutch switching according to the target separation speed, the target combination speed and the target speed.

By adopting the intelligent clutch control system and the control method thereof, the performances of automatic climbing, gear switching, oil consumption and the like of the automobile can be improved.

Firstly, the vehicle does not flameout when creeping and starting:

in the prior art, the traditional MT vehicle type starting has high requirement on the proficiency of a driver for controlling a clutch, the engine is easy to shut down due to improper matching of the clutch and an accelerator, and frequent starting is needed particularly under congested road conditions. The intelligent clutch vehicle type starting working condition reasonably judges the clutch engaging speed according to the rotating speed difference of the engine and the clutch input shaft, so that the engine rotating speed is stable, and the engine can be started easily without flameout. For the working condition of crawling, the traditional MT vehicle type needs half linkage to realize, and the clutch plate is easy to wear in the early stage for a long time.

Referring to fig. 3 and fig. 4, for the intelligent clutch control system of the present embodiment, after the intelligent clutch system detects a 1-gear or 2-gear signal, the ICS actuator drives the clutch to be quickly coupled to the position 01(160), so that the entire vehicle has a smaller torque transmission capability to ensure a fast response (the current clutch is in a half-linked state). After the brake switch signal is set to 0 (the brake pedal is released), the brake switch signal is quickly and stably combined downwards along a 02 curve, so that the transmission torque of the whole vehicle reaches a target value, stable crawling is ensured, the crawling speed is controllable, and the driving fatigue and the operation difficulty of urban congestion working conditions are greatly reduced (the whole process is operated for 1 s).

(II) the automobile gear shifting is smoother:

referring to fig. 5 and 6, the intelligent clutch control system intelligently determines whether the current engine speed is greater than the engine speed corresponding to the target gear speed under different working conditions of different gears to match different clutch engagement speeds, so as to achieve smooth shifting without impact. Specifically, curve data are combined to the clutch kiss point fast, the deceleration is combined to the crawling point, the reasonable combination speed of the clutch is judged comprehensively according to signals such as the rotating speed, the vehicle speed, the torque and the accelerator opening degree, the clutch is combined fast after synchronization is completed, therefore, the fact that the vehicle keeps small rotating speed difference and the stability of the vehicle speed all the time in the gear shifting process is guaranteed, and the gear shifting smoothness of the whole vehicle is optimized greatly.

(III) the oil-saving performance and the longer clutch service life are achieved:

referring to fig. 7 and 8, in the present embodiment, the method includes the following steps:

s201, a shift operation is started.

And S202, whether a new gear is established or not.

S203, whether the current engine speed is greater than the engine speed corresponding to the gear speed or not is judged.

And S204, reducing the current engine speed to apply the rotational inertia of the engine to the wheels of the automobile.

And S205, exiting.

As shown in fig. 8, the curve data is 1/2 engine speeds corresponding to the same working condition of the trolley, the speed drop of the intelligent clutch system is controlled within 80rpm, and the stepping speed is reduced by more than 200 rpm. The intelligent clutch system can act the rotational inertia of the engine on wheels through the reduced rotating speed at the moment of gear shifting to realize oil saving (the oil consumption can be saved by 1L/100km in a JMC real vehicle VOCF long-mileage working condition test (the oil consumption can be saved by 7% in statistics compared with the conventional foot-treading MT vehicle).

In the embodiment, the rising amount of the rotating speed of the engine is effectively controlled by the intelligent clutch system through a control strategy in the starting working condition and the gear shifting process, the synchronization of the clutch is completed in the shortest time, the oil is saved, and the friction power of the clutch is reduced at the same time, so that the effect of prolonging the service life of the clutch is achieved.

Example three:

due to the clearance of transmission system parts, the problem of clonk (knocking) often occurs in low-gear downshift of the rear-drive vehicle, the cost of transmission system hardware needs to be increased, torque filtering is performed by EMS software, and the dynamic property of the whole vehicle after downshift can be influenced after the torque filtering is performed.

In order to solve the technical problem, a third embodiment of the present invention provides a method for eliminating the knocking problem, including the steps of:

s301, the existence of the knocking problem is detected.

S302, judging whether the automobile is in a gear state.

And S303, judging whether the opening of the throttle valve is zero or not.

S304, judging whether the current vehicle speed is more than 5 km/h.

S305, judging whether the clutch position is smaller than the crawling target value.

S306, requesting a lift of the engine torque to 30 n.m.

And S307, exiting.

The intelligent clutch system can effectively control the reduction rate of the engine torque through the torque request to avoid torque reversing, and meanwhile, the engine output torque is stable when the rotating speed reaches the synchronous rotating speed of the vehicle, so that the clonk problem is optimized.

Those skilled in the art will appreciate that all or part of the steps in the method for implementing the above embodiments may be implemented by a program instructing the relevant hardware. The program may be stored in a computer-readable storage medium. Which when executed comprises the steps of the method described above. The storage medium includes: ROM/RAM, magnetic disk, optical disk, etc.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. An intelligent clutch control system is characterized by comprising an ICS electronic control unit, a gear selecting and shifting position sensor, a gear shifting intention sensor, a clutch operating mechanism, a clutch position sensor and an electronic throttle valve;

2. The intelligent clutch control system of claim 1, wherein when it is determined that the current engine speed is less than the difference between the target engine speed and the engine speed threshold, the target disengagement speed is set to a calibrated disengagement speed, wherein the calibrated disengagement speed is a manually preset calibrated value.

3. The intelligent clutch control system according to claim 1, wherein when it is determined that the current engine speed is greater than the sum of a target engine speed and an engine speed threshold, the target engagement speed is calculated according to the current vehicle operating condition information;

wherein the formula of the target binding speed is:

4. The intelligent clutch control system according to claim 1, wherein the target speed is calculated by the formula:

5. The intelligent clutch control system according to claim 1, wherein the target speed is calculated by the formula:

6. A control method of an intelligent clutch control system, which is characterized by comprising an ICS electronic control unit, a gear selecting and shifting position sensor, a gear shifting intention sensor, a clutch operating mechanism, a clutch position sensor and an electronic throttle valve, and comprises the following steps:

7. The control method of the intelligent clutch control system according to claim 6, wherein when the current engine speed is judged to be less than the difference between the target engine speed and the engine speed threshold, the target separation speed is set as a calibrated separation speed, wherein the calibrated separation speed is a manually preset calibrated value;

wherein the formula of the target binding speed is:

8. The control method of an intelligent clutch control system according to claim 6, wherein the target speed is calculated by the formula:

9. The control method of the intelligent clutch control system according to claim 6, further comprising:

10. The control method of the intelligent clutch control system according to claim 6, further comprising:

if yes, the engine torque is raised to 30 N.m.