CN107985319A - A kind of automobile power assembly rotation speed regulating method and device - Google Patents

Abstract

The invention relates to the field of automobiles, and specifically discloses a method and device for adjusting the rotational speed of an automobile powertrain. Measure the speed to obtain the reference speed of the gearbox and engine in the automobile powertrain; calculate the difference between the reference speed of the gearbox and the engine and its measured speed; compare the absolute value of the difference with the preset value, and according to Compare the result and the measured speed of the gearbox/engine before the next shift to the current gear/clutch next time to determine the actual speed of the gearbox/engine. The present invention also provides an automobile, which adopts the method for adjusting the rotation speed of the automobile power assembly. The invention solves the problems of large gear shifting impact and clutch combination impact caused by large measurement error of the rotational speed sensor, and improves the service life of each component in the automobile power assembly and the comfort performance of the automobile.

Description

Method and device for adjusting speed of automobile powertrain

technical field

The invention relates to the field of automobiles, in particular to a method and device for adjusting the rotational speed of an automobile powertrain.

Background technique

The powertrain of pure electric vehicles and hybrid vehicles in automatic transmission vehicles includes engines, clutches, motors and gearboxes. The engine, gearbox and motor in the powertrain are equipped with speed sensors for measuring the speed. Since each component of the powertrain is provided by different suppliers and there is no uniform standard, each component has Different brands of speed sensors are used.

However, due to differences in the accuracy requirements of different brands of speed sensors, there is a difference between the measured speed of each component and the actual speed when the clutch is fully engaged and in a certain gear. When shifting or clutching, if the absolute value of the difference is large, it will cause a large impact on shifting or clutching, which will affect the normal operation of the system, and even cause shifting failure; reduce the total power of the vehicle. The service life of each component in the process and the comfort performance of the car.

Contents of the invention

The purpose of the present invention is to provide a method and device for adjusting the rotational speed of an automobile powertrain, which can solve the problem that various parts of the automobile powertrain are easily caused by large shifting impact or clutch coupling impact due to large rotational speed measurement errors.

For reaching this purpose, the present invention adopts following technical scheme:

A method for adjusting the rotational speed of an automobile powertrain, comprising the following steps:

After shifting to the current gear, obtain the measured speed of the motor in the powertrain of the car, and obtain the reference speed of the gearbox and engine in the powertrain of the car according to the measured speed of the motor;

Calculate the difference between the reference speed of the gearbox and the engine and its measured speed;

Compare the absolute value of the difference with the preset value, and determine the gearbox/engine according to the comparison result and the measured speed of the gearbox/engine before the next shift to the current gear/clutch next time. actual rotational speed.

Further, according to the measured speed of the motor, the reference speed of the gearbox and the engine in the powertrain of the vehicle is obtained, including

According to the rotational speed ratio relationship between the motor and the engine and gearbox in the automobile powertrain, and the measured rotational speed of the motor, determine the reference speed of the engine and gearbox in the automobile powertrain.

Further, the actual speed of the transmission/engine is determined according to the comparison result and the measured speed of the transmission/engine before the next shift to the current gear/clutch engagement next time, including

If the absolute value of the difference is greater than the preset value, the measured rotational speed of the gearbox/engine is corrected by the difference before the next shift to the current gear/clutch is engaged next time, so as to obtain the gearbox/engine the actual speed of the engine;

If the absolute value of the difference is not greater than the preset value, the measured rotational speed of the gearbox/engine is used as the actual rotational speed before the next shift to the current gear/the next engagement of the clutch.

Further, the measured rotational speed of the gearbox/engine is corrected by the difference before the next shift to the current gear/the clutch is engaged next time, so as to obtain the actual rotational speed of the gearbox/engine, including

Obtain the measured speed of the gearbox/engine before the next shift to the current gear/clutch next time;

The actual speed of the gearbox/engine is equal to the sum of its measured speed and the corresponding difference.

Further, before shifting gears, the current measured rotational speed of the gearbox is corrected to obtain the actual rotational speed of the gearbox.

Further, before the clutch is engaged, the current measured rotational speed of the engine is corrected to obtain the actual rotational speed of the engine.

Further, the measured rotational speed of the engine is the output rotational speed of the engine; the measured rotational speed of the motor is the output rotational speed of the motor; the measured rotational speed of the gearbox is the output rotational speed of the gearbox.

In order to achieve the above object, the present invention also provides an automobile powertrain speed adjustment device, using the above automobile powertrain speed adjustment method, the automobile powertrain speed adjustment device includes a measurement module, a data receiving and processing module, and an automobile powertrain speed adjustment device. Powertrain control module;

The measurement module is used to obtain the measured rotational speeds of the engine, the gearbox and the motor;

The data receiving and processing module can receive the signal that the shifting/clutch is completed sent by the vehicle powertrain control module, and calculate the reference speed of the gearbox and the engine based on the measured rotational speed of the motor when receiving the signal. The difference between the rotating speed and the measured rotating speed, comparing the difference with the preset value, and sending the comparison result to the vehicle powertrain control module;

The vehicle powertrain control module will determine the actual speed of the gearbox/engine according to the comparison result and the measured speed of the gearbox/engine before the next shift to the current gear/clutch engagement next time.

Further, the vehicle powertrain control module communicates with the data receiving and processing module through the CAN bus.

Further, the measurement module includes a Hall-type rotational speed sensor for measuring the output rotational speed of the engine, a Hall-type rotational speed sensor for measuring the output rotational speed of the gearbox, and a transformer-type sensor for measuring the output rotational speed of the motor.

Further, the Hall-type speed sensor for measuring the output speed of the engine, the Hall-type speed sensor for measuring the output speed of the gearbox, and the transformer-type sensor for measuring the output speed of the motor are all connected to the data receiving and processing module.

Further, the Hall-type speed sensor for measuring the output speed of the engine is connected to the controller of the engine, the Hall-type speed sensor for measuring the output speed of the gearbox is connected to the controller of the gearbox, and the transformer-type sensor for measuring the output speed of the motor is connected to the motor. The controller of the engine, the controller of the gearbox and the controller of the motor all communicate with the data receiving and processing module through the CAN bus.

Beneficial effects of the present invention: the present invention selects the motor with the highest speed accuracy requirement in the automobile powertrain as a reference component, takes the measured speed of the motor as its actual speed, and according to the speed ratio relationship between the selected motor, the engine and the gearbox , determine whether the measured speed of the engine and gearbox is within the allowable range of error, if it exceeds the allowable range of error, correct the measured speed of the engine and gearbox to solve the large shifting impact caused by the large measurement error of the speed sensor and the Combined with the big problem of shock, the clutch improves the service life of each component in the vehicle powertrain and the comfort performance of the vehicle.

Description of drawings

Fig. 1 is the flow chart of the method for adjusting the rotational speed of the automobile powertrain according to the present invention;

Fig. 2 is a schematic diagram of the automobile powertrain speed adjusting device according to the present invention.

Detailed ways

The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.

This embodiment provides a method for adjusting the rotational speed of an automobile powertrain. The automobile described in this embodiment may be a pure oil automatic transmission vehicle, an automatic transmission parallel hybrid vehicle or an automatic transmission hybrid hybrid vehicle. Taking a block-parallel hybrid vehicle as an example, the adjustment method is described in detail. Fig. 1 is a flow chart of the adjustment method described in this embodiment, and the method specifically includes the following steps:

Step 1. After shifting to the current gear, obtain the measured rotational speed of the motor in the vehicle powertrain.

The motor, engine and gearbox in the automobile powertrain are equipped with speed sensors, and the corresponding speed is measured by the speed sensor. The measured speed of the engine is the output speed of the engine; the measured speed of the motor is the output speed of the motor; the measured speed of the gearbox is the output speed of the gearbox.

Among them, in the automotive powertrain, compared with the engine and gearbox, the measurement accuracy of the motor speed is higher, and the corresponding speed sensor for measuring the motor speed has higher precision requirements. The output speed of the engine and gearbox is usually measured by a Hall-type speed sensor with a slightly lower precision, and the output speed of the motor is measured by a transformer-type sensor with a higher precision. Therefore, among motors, engines and gearboxes, the accuracy of the measured speed of the motor is relatively high, that is, it is closest to the actual speed. In this embodiment, the motor is selected as a reference component, and the measured rotational speed of the motor is regarded as the actual rotational speed of the motor.

Step 2. Determine the reference speeds of the engine and gearbox in the automobile powertrain according to the ratio relationship between the motor and the engine and gearbox in the automobile powertrain, and the measured speed of the motor.

When the clutch is fully engaged and in a certain gear, the speed ratio relationship among the engine, motor and gearbox in the vehicle powertrain is determined and known.

In this embodiment, when the clutch is fully engaged and the gearbox is in a certain gear, the measured rotational speed of the motor is denoted as n ₀ , the rotational speed ratio between the engine and the motor is denoted as a _i , and the rotational speed between the gearbox and the motor is The ratio is denoted as b. According to the measured rotational speed n ₀ of the motor, the reference rotational speed of the engine can be calculated _nengineref =a _i *n ₀ ; the reference rotational speed of the gearbox in the current gear _{is ngearboxref} =b*n ₀ .

Step 3, calculating the difference between the reference rotational speed of the gearbox and the engine and the measured rotational speed.

In this embodiment, when the clutch is fully engaged and the gearbox is in a certain gear, the measured rotational speed of the gearbox is measured by a Hall-type rotational speed sensor that measures the output rotational speed of the gearbox, and the measured rotational speed of the gearbox is recorded as n _{gearbox measurement} ; Measure the measured rotational speed of the engine by measuring the Hall-type rotational speed sensor of the engine output rotational speed, and record the measured rotational speed of the engine as n _{engine measurement} .

Then the difference between the measured speed of the engine and the reference speed △ _engine = n _{engine reference} - n _{engine measurement} ; the difference between the measured speed of the gearbox and the reference speed △ _gearbox = n _{gearbox reference} - n _{gearbox measurement} .

Step 4, comparing the absolute value of the difference with a preset value.

The preset value refers to the maximum value of the allowable error of the measured speed of the gearbox or the engine, wherein the maximum value of the allowable error of the measured speed of the gearbox is _{recorded as △ Gearbox preset} , the allowable error of the measured speed of the engine The maximum value is recorded as △ _{engine preset} .

Step 5. If the absolute value of the difference is greater than the preset value, then use the difference to correct the measured rotational speed of the gearbox/engine before the next shift to the current gear/clutch engagement next time to obtain The actual speed of the gearbox/engine.

Due to the existence of the measurement error of the rotational speed sensor, if the absolute value of the difference is greater than the preset value, it is very easy to cause a shift shock during the next shift. Taking upshift as an example for illustration, there are mainly the following problems:

1. If the measured speed of the gearbox is too high, when the measured speed of the gearbox reaches the shift speed, the actual speed of the gearbox has not yet reached the shift speed.

2. If the measured speed of the gearbox is too small, when the measured speed of the gearbox reaches the shift speed, the actual speed of the gearbox has already exceeded the shift speed.

The above two situations will cause a large shifting impact, and even cause shifting failure, reducing the service life of the gearbox and the comfort of the car.

If the motor was used as the power alone before, the clutch needs to be combined when the engine is subsequently connected, and the engine is used as the power or the engine and the motor are used together as the power. Due to the existence of the measurement error of the speed sensor, it is easy to cause the following problems:

1. If the speed of the engine is too high, when the measured speed of the engine reaches the required speed when the clutch is engaged, the actual speed of the engine has not yet reached the required speed when the clutch is engaged.

2. If the engine speed is relatively small, when the measured engine speed reaches the required speed when the clutch is engaged, the actual engine speed has exceeded the required speed when the clutch is engaged.

The above two situations will cause a large impact on the clutch combination, reducing the service life of the clutch, engine and motor, and the comfort of the car.

Therefore, this embodiment corrects the measured rotational speed of the gearbox/engine through the difference before the next shift to the current gear/clutch engagement next time, so as to obtain the actual rotational speed of the gearbox/engine; subsequent judgments are made whether gear shifting is required When / whether the clutch can be combined, use the calculated actual speed to judge, which will solve the above-mentioned problems caused by the existence of the measurement error of the speed sensor.

Specifically, the measured rotational speed of the gearbox/engine before the next shift to the current gear/clutch engagement is first obtained; the actual rotational speed of the gearbox/engine is equal to the sum of the measured rotational speed and the corresponding difference.

Specifically, before the next gear shift, if |△ _gearbox |>△ _{gearbox preset} , the current actual speed of the gearbox _{ngearbox actual} =△ _gearbox + _{ngearbox measurement} ; before the clutch is engaged, if | △ _Engine |>△ _{Engine preset} , then the current actual speed of the engine nengine _actual =△ _engine + _{nengine measurement} .

In this embodiment, it is only necessary to correct the current measured rotational speed of the gearbox to obtain the actual rotational speed of the gearbox before shifting gears. Before the clutch is engaged, it is only necessary to correct the current measured rotational speed of the engine to obtain the actual rotational speed of the engine.

Step 6. If the absolute value of the difference is not greater than the preset value, then use the measured rotational speed of the gearbox/engine as its actual rotational speed before shifting to the current gear/engaging the clutch next time.

If the absolute value of the difference is not greater than the preset value, it means that the measurement error of the speed sensor is within the allowable range, and the impact on shifting and clutch engagement is relatively small and can be ignored. The speed is directly used as the actual speed of the component.

Specifically, before the next gear shift, if |△ _gearbox |≤△ _{gearbox preset} , the current actual speed of the gearbox _{ngearbox actual} =ngearbox _measurement ; before the clutch is engaged, if |△ _engine |≤ △ _{Engine preset} , then the current actual speed of the gearbox n _{engine actual} = n _{engine measurement} .

In this embodiment, by selecting a motor with high requirements for speed measurement accuracy as a reference component, the measured speed of the motor is used as the actual speed of the motor, and according to the speed ratio relationship between the motor, the engine and the gearbox, the engine and gearbox are determined. Whether the measured speed is within the allowable range of error, if it exceeds the allowable range of error, correct the measured speed of the engine and gearbox to solve the problem of large shifting impact and clutch coupling impact caused by large measurement error of the speed sensor, and improve The service life of each component in the vehicle powertrain and the comfort performance of the vehicle are guaranteed.

The method for adjusting the rotational speed of the automobile powertrain described in this embodiment needs to calculate the corresponding difference after each gear shift/clutch combination is completed, which will be used for the gearbox/engine when the next shift to the current gear/clutch is combined next time. The measured RPM is corrected to obtain the actual RPM of the gearbox/engine. Taking gear shifting as an example, if the difference is calculated when shifting to fourth gear, then the difference can only be used for the gearbox before shifting from fourth gear or fifth gear to the current gear. The measured speed is corrected to obtain the actual speed of the gearbox, so as to reduce the shifting impact from other gears to the current gear.

As shown in Figure 2, this embodiment also provides an automobile, using the above-mentioned automobile powertrain speed adjustment method, the automobile powertrain speed adjustment device includes a measurement module, a data receiving and processing module, and an automobile powertrain control module; the measurement module is used to obtain the measured rotational speed of the engine, gearbox and motor; the data receiving and processing module can receive the signal that the gear shift/clutch combination is completed sent by the vehicle powertrain control module, and When the signal is received, calculate the difference between the reference speed of the gearbox and the engine and its measured speed based on the measured speed of the motor, compare the difference with the preset value, and send the comparison result to the vehicle power Assembly control module; the vehicle powertrain control module will determine the actual speed of the gearbox/engine according to the comparison result and the measured speed of the gearbox/engine before the next change to the current gear/clutch next time. Rotating speed.

In this embodiment, the vehicle powertrain control module communicates with the data receiving and processing module through the CAN bus. It is convenient to realize the information interaction between the vehicle powertrain control module and the data receiving and processing module.

The measurement module includes a Hall-type speed sensor for measuring the output speed of the engine, a Hall-type speed sensor for measuring the output speed of the gearbox, and a transformer-type sensor for measuring the output speed of the motor. In this embodiment, the Hall-type speed sensor for measuring the output speed of the engine, the Hall-type speed sensor for measuring the output speed of the gearbox, and the transformer-type sensor for measuring the output speed of the motor are all connected to the data receiving and processing module.

The sensors used in this embodiment can also be connected to the data receiving and processing module in other ways, as long as the data receiving and processing module can obtain the measured rotational speeds of the engine, motor and gearbox. For example: connect the Hall-type speed sensor for measuring the output speed of the engine to the controller of the engine, the Hall-type speed sensor for measuring the output speed of the gearbox is connected to the controller of the gearbox, and the transformer-type sensor for measuring the output speed of the motor is connected to the motor The controller of the engine, the controller of the gearbox and the controller of the motor all communicate with the data receiving and processing module through the CAN bus.

This embodiment can solve the problems of large shifting impact and clutch coupling impact caused by large measurement error of the rotational speed sensor, and improves the service life of various components in the automobile powertrain and the comfort performance of the automobile.

Apparently, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the implementation of the present invention. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. All modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the claims of the present invention.

Claims (12)

1. A method for adjusting the rotational speed of an automobile powertrain, characterized in that, comprising the following steps: After shifting to the current gear, obtain the measured speed of the motor in the powertrain of the car, and obtain the reference speed of the gearbox and engine in the powertrain of the car according to the measured speed of the motor; Calculate the difference between the reference speed of the gearbox and the engine and its measured speed; Compare the absolute value of the difference with the preset value, and determine the gearbox/engine according to the comparison result and the measured speed of the gearbox/engine before the next shift to the current gear/clutch next time. actual rotational speed. 2. The automobile powertrain rotational speed adjustment method according to claim 1, characterized in that, obtaining the reference rotational speed of gearbox and engine in the automobile powertrain according to the measured rotational speed of the motor comprises: According to the rotational speed ratio relationship between the motor and the engine and gearbox in the automobile powertrain, and the measured rotational speed of the motor, determine the reference speed of the engine and gearbox in the automobile powertrain. 3. The automobile powertrain rotational speed adjustment method according to claim 1, characterized in that, according to the comparison result and the measured rotational speed of the gearbox/engine before the next shift to the current gear/clutch next time, Determine the actual RPM of the transmission/engine, including: If the absolute value of the difference is greater than the preset value, the measured rotational speed of the gearbox/engine is corrected by the difference before the next shift to the current gear/clutch is engaged next time, so as to obtain the gearbox/engine the actual speed of the engine; If the absolute value of the difference is not greater than the preset value, the measured rotational speed of the gearbox/engine is used as the actual rotational speed before the next shift to the current gear/the next engagement of the clutch. 4. The method for adjusting the rotational speed of the automobile powertrain according to claim 3, characterized in that, the measured rotational speed of the gearbox/engine is measured by the difference before the next change to the current gear/clutch next time. Calibration to get the actual RPM of the gearbox/engine including: Obtain the measured speed of the gearbox/engine before the next shift to the current gear/clutch next time; The actual speed of the gearbox/engine is equal to the sum of its measured speed and the corresponding difference. 5. The method for adjusting the rotational speed of an automobile powertrain according to claim 4, wherein, before shifting gears, the current measured rotational speed of the gearbox is corrected to obtain the actual rotational speed of the gearbox. 6. The method for adjusting the rotational speed of the automobile powertrain according to claim 4, wherein, before the clutch is engaged, the current measured rotational speed of the engine is corrected to obtain the actual rotational speed of the engine. 7. The method for adjusting the rotational speed of the automobile powertrain according to claim 4, wherein the measured rotational speed of the engine is the output rotational speed of the engine; the measured rotational speed of the motor is the output rotational speed of the motor; the measured rotational speed of the gearbox is the output rotational speed of the gearbox output speed. 8. An automobile powertrain speed adjustment device, characterized in that, the automobile powertrain speed adjustment method according to any one of claims 1 to 7 is adopted, and the automobile powertrain speed adjustment device comprises a measurement module, a data receiving and Processing modules and automotive powertrain control modules; The measurement module is used to obtain the measured rotational speeds of the engine, the gearbox and the motor; The data receiving and processing module can receive the signal that the shifting/clutch is completed sent by the vehicle powertrain control module, and calculate the reference speed of the gearbox and the engine based on the measured rotational speed of the motor when receiving the signal. The difference between the rotating speed and the measured rotating speed, comparing the difference with the preset value, and sending the comparison result to the vehicle powertrain control module; The vehicle powertrain control module will determine the actual speed of the gearbox/engine according to the comparison result and the measured speed of the gearbox/engine before the next shift to the current gear/clutch engagement next time. 9 . The vehicle powertrain speed adjusting device according to claim 8 , wherein the vehicle powertrain control module communicates with the data receiving and processing module through the CAN bus. 10. The automobile powertrain speed adjustment device according to claim 8, characterized in that, the measurement module includes a Hall-type speed sensor for measuring the output speed of the engine, and a Hall-type speed sensor for measuring the output speed of the gearbox. a rotational speed sensor, and a transformer sensor for measuring the output rotational speed of the motor. 11. The automobile powertrain rotational speed adjusting device according to claim 10, characterized in that, the Hall-type rotational speed sensor for measuring the output rotational speed of the engine, the Hall-type rotational speed sensor for measuring the output rotational speed of the gearbox, and the measuring motor output rotational speed Transformer sensors are all connected to the data receiving and processing module. 12. The automobile powertrain rotational speed adjustment device according to claim 10, characterized in that, the Hall-type rotational speed sensor for measuring the output rotational speed of the engine is connected to the controller of the engine, and the Hall-type rotational speed sensor for measuring the output rotational speed of the gearbox is connected to In the controller of the gearbox, the transformer sensor for measuring the output speed of the motor is connected to the controller of the motor. The controller of the engine, the controller of the gearbox and the controller of the motor all communicate with the data receiving and processing module through the CAN bus .