CN101451612B - Gear engaging method without clutch and gear engaging control system at vehicle starting - Google Patents

Abstract

A method for clutchless gear engagement when a vehicle starts, comprising: (a) detecting the current gear of a transmission; (b) judging whether the current gear of the transmission is in a target gear, and if it is in the target gear, then controlling a motor to drive The vehicle starts, if it is not in the target gear, then perform the following steps; (c) control the gear-in-gear actuator to perform the gear-in operation with a constant gear-in force; (d) detect whether the gear-in operation in step (c) is successful , if the gearing is successful, then control the motor to drive the vehicle to start, if the gearing fails, then control the motor to drive the first shaft of the transmission to rotate an angle; (e) Repeat the above steps (c)-(d) until the transmission The gear is successfully engaged and the motor drives the vehicle to start. The gear-engaging actuator does not need to forcibly engage gears with gradually increasing gear-engaging force, so noise and vibration will not be generated and the service life of the transmission will not be affected. Also provided is a clutchless gear engagement control system when the vehicle starts.

Description

Clutch-free gear-engaging method and gear-engaging control system when vehicle starts

technical field

The invention relates to a clutchless gear-in-gear method and a gear-in-gear control system when a vehicle starts.

Background technique

In conventional internal combustion engine vehicles it is common to have a clutch that is disengaged prior to a gear change and re-engaged after the gear change. Driving power will be interrupted during the clutch disengagement process, and vehicle impact will also occur when the clutch is re-engaged, which will affect the comfort of the vehicle.

In a vehicle that can be driven by a motor, such as an electric vehicle or a hybrid vehicle, since the speed of the motor can be adjusted conveniently, a clutchless gear shifting method can be adopted.

For example, CN1974262A discloses a clutchless transmission system for a motor-driven automobile, which includes a drive motor, a mechanical multi-gear transmission, a drive motor controller and a transmission controller. When shifting is required, the transmission controller sends the shift signal to the drive motor controller, and the drive motor controller controls the torque and speed of the drive motor to match the speed of the first shaft and the second shaft of the transmission, thereby achieving smooth shift gears.

During the driving process, since the rotational speed of the motor can be precisely adjusted, the above method can usually achieve better gear shifting effect. However, when the vehicle starts to move from a standstill, the transmission may not be in a defined gear. For example, during the running of the vehicle, braking the vehicle while shifting gears (such as in an emergency) may cause the transmission not to be in any determined gear position after the vehicle stops. Therefore, when the vehicle starts, it is first necessary to put the transmission into a certain target gear. During this gear engagement, there is a fixed phase difference between the gears on the first shaft and the gears on the second shaft of the transmission due to the motor being at rest. If the phase difference just meets the phase requirement when the gear is engaged, the transmission can be smoothly engaged to the target gear, and then the motor is started to drive the vehicle to start. However, the phase difference cannot meet the above requirements in most cases, so that gear engagement cannot be successfully completed.

In the case that the above-mentioned phase difference cannot meet the requirements of gear engagement, in order to achieve gear engagement, the shifting or gearing actuator (such as a gear shifting motor) needs to continuously increase the shifting force to produce continuous impact on the first shaft of the transmission , so that the first shaft is gradually rotated through a certain angle due to continuous impact, and finally the above-mentioned phase difference meets the requirements of the gear to complete the gear. However, since the rotor of the motor is connected to the first shaft of the transmission, the rotor has a large moment of inertia when it is at rest, and the starting torque required to rotate the rotor is also relatively large, so the shift actuator needs to exert a large force on the first shaft of the transmission. The shaft undergoes constant impact. Therefore, a lot of noise and vibration will be generated in the process, and the service life of the transmission, especially the synchronizer for shifting gears in the transmission, will be greatly shortened.

Contents of the invention

Therefore, an object of the present invention is to provide a method of clutchless gear engagement when the vehicle is started, which can easily make the phase difference between the gear on the first shaft and the gear on the second shaft of the transmission meet the requirements of gear engagement. Requirements, so that the gear can be smoothly realized, and basically no noise and vibration will be generated, and the service life of the synchronizer will not be affected.

In order to achieve the above object, the present invention provides a method for clutchless gear engagement when the vehicle starts, the method includes the following steps:

(a) detecting the current gear of the transmission;

(b) judge whether the current gear of the transmission is in the target gear, if it is in the target gear, then control the motor to drive the vehicle to start, if not in the target gear, then perform the following steps;

(c) Control the gear closing actuator to perform the gear closing operation with a constant gear closing force;

(d) Check whether the gear-engaging operation in the step (c) is successful, if the gear-engaging is successful, then control the motor to drive the vehicle to start, if the gear-engaging fails, then control the motor to drive the first shaft of the transmission to rotate an angle;

(e) Repeat steps (c)-(d) above until the transmission is successfully engaged and the motor drives the vehicle to start.

When the vehicle starts to start, it is first judged whether the transmission is in the target gear. In some cases, the transmission may not be in a certain target gear when the vehicle starts to move from a standstill. At this time, the gear-in operation is performed with a constant gear-in force by controlling the gear-in actuator. If the gear engagement is unsuccessful, it indicates that there is a phase difference between the gear on the first shaft of the transmission and the gear on the second shaft, and the phase difference does not meet the gear engagement requirements. At this time, the motor controller controls the motor to drive the first shaft of the transmission to rotate through a predetermined angle, so as to eliminate the above-mentioned phase difference or make the phase difference meet the gear-engagement requirement. Then repeat the above-mentioned gear-engaging operation, and then start the motor again until the gear-engaging is successful, so that the speed changer is on the predetermined target gear.

In this method, when the gearing fails, the gearing actuator does not need to use the gradually increasing gearing force to forcibly engage the gears, so there will be no impact on the transmission, thus no noise and vibration will be generated, and it will not affect the transmission. Normal service life of the transmission.

Another object of the present invention is to provide a clutchless gear engagement control system when the vehicle starts, the system comprising:

a transmission controller configured to send a current gear signal of the transmission to the motor controller; and a motor controller configured to receive the current gear signal and determine whether the current gear is in a target gear according to the current gear signal, and if in The target gear controls the motor to drive the vehicle to start, and if it is not in the target gear, it sends a gear-in signal to the transmission controller; wherein,

The transmission controller is further configured to: when receiving a gear-in signal from the motor controller, control the gear-in actuator to perform a gear-in operation with a constant gear-in force, detect whether the gear-in operation is successful, and send a gear-in The success signal or the gear failure signal is sent to the motor controller;

The motor controller is further configured to: when receiving the gear-engagement success signal from the transmission controller, control the motor to drive the vehicle to start, and when receiving the gear-engagement failure signal from the transmission controller, control the motor to drive The first shaft of the transmission turns an angle, and then sends the signal to engage the transmission again to the transmission controller.

When the gear is engaged through the system, there will be no impact on the transmission, so that no noise and vibration will be generated, and the normal service life of the transmission will not be affected.

Description of drawings

FIG. 1 is a flow chart of a method for engaging gear without a clutch when the vehicle starts according to an embodiment of the present invention.

FIG. 2 is a block diagram of a clutchless gear engagement control system when the vehicle starts according to an embodiment of the present invention.

Detailed ways

FIG. 1 is a flow chart of a method for engaging gear without a clutch when the vehicle starts according to an embodiment of the present invention. As shown in Figure 1, the clutch-free gear-engaging method when the vehicle of the present invention starts comprises the following steps:

(a) detecting the current gear of the transmission;

(b) judge whether the current gear of the transmission is in the target gear, if it is in the target gear, then control the motor to drive the vehicle to start, if not in the target gear, then perform the following steps;

(c) Control the gear closing actuator to perform the gear closing operation with a constant gear closing force;

(d) Check whether the gear-engaging operation in the step (c) is successful, if the gear-engaging is successful, then control the motor to drive the vehicle to start, if the gear-engaging fails, then control the motor to drive the first shaft of the transmission to rotate an angle;

(e) Repeat steps (c)-(d) above until the transmission is successfully engaged and the motor drives the vehicle to start.

In the present invention, the vehicle is preferably an electric vehicle or a hybrid vehicle that can be driven or started by a motor.

In the present invention, the motor is directly mechanically connected with the first shaft (input shaft) of the transmission to input power into the transmission. The second shaft (output shaft) of the transmission is used to output the power from the motor to drive the vehicle to start or drive. The transmission is preferably a mechanical automatic transmission. The in-gear actuator is preferably driven by an in-gear motor. The shifting actuator can adopt an existing structure, which generally includes a shifting fork, a shift block, a shifting shaft and the like.

The method for engaging gears when the vehicle is started will be described in detail below through specific embodiments.

First judge whether the vehicle speed is zero. If the vehicle speed is not zero, it indicates that the vehicle does not satisfy the condition of starting from a stationary state, so the method of the present invention is not executed.

If the vehicle speed is zero, the gearbox controller judges whether the gearbox is in the determined target gear. If the gearbox is in the determined target gear, the motor will directly drive the vehicle to start, and the gear-engagement program ends. If the gearbox is not in the defined target gear, the accelerator pedal signal is checked. If the accelerator pedal is stepped on, it indicates that the vehicle starts to start, and then enters the gear state.

First, the transmission controller controls the gear-in actuator to perform the gear-in operation with a constant gear force so that the transmission is in a determined target gear. If the gearing is successful, the transmission is in the target gear, the motor drives the vehicle to start, and the gearing procedure ends. If the gearing fails, it indicates that there is a phase difference between the gear on the first shaft of the transmission and the gear on the second shaft and the phase difference does not meet the gearing requirements. At this time, the gearing operation is stopped, the gearing actuator stops, and Instead of trying to continue the engagement operation with greater engagement force. The transmission controller sends a signal of failure to engage the gear to the motor controller.

After the motor controller receives the above-mentioned signal of gear failure, the motor controller controls the motor to start to drive the first shaft of the transmission to rotate through a predetermined angle, so as to eliminate the above-mentioned phase difference or make the phase difference meet the gear-engagement requirements, and then Stop the motor.

The predetermined angle is preferably determined by a pulse width modulation control signal output by the motor controller. The duty ratio of the pulse width modulation control signal is preferably 5%-10%. The loading time of the pulse width modulation control signal is preferably 10 milliseconds to 100 milliseconds.

After the motor stops, perform the above-mentioned gear-engaging operation again. At this time, if the above-mentioned phase difference has been eliminated or the phase difference meets the gear-engagement requirement, the transmission can be gear-engaged smoothly. If the phase difference still does not meet the gear-engagement requirement, then the gear-engagement fails, and then repeat the step of making the first shaft of the transmission rotate through a certain angle by the motor, and then execute the gear-engagement operation again until the gear-engagement is successful.

As mentioned above, in the gear-in operation of the gear-in actuator, the gear-in actuator always executes the gear-in operation with a constant magnitude of gear-in force (the gear-in force during normal gear-in), thereby avoiding the failure of the gear-in-gear. Some of the problems caused by constantly increasing the gearing force to try to engage the gear, such as noise and vibration, and damage to the transmission.

Therefore, through the method of the present invention, after the gearing actuator fails to be geared, the motor controller outputs a pulse width modulation control signal to the motor, and selects an appropriate duty cycle and loading time, so that reverse compounding can be performed in a short time. gear until the gear is successfully engaged, so there will be no vibration and noise, and no damage to the transmission.

FIG. 2 is a block diagram of a clutchless gear engagement control system when the vehicle starts according to an embodiment of the present invention.

As shown in FIG. 2 , a clutchless gear-engagement control system when a vehicle starts in the present invention includes: a transmission controller configured to send a current gear signal of the transmission to a motor controller; and a motor controller configured to Receive the current gear signal and judge whether the current gear is in the target gear according to the current gear signal. If it is in the target gear, control the motor to drive the vehicle to start. If it is not in the target gear, send a signal to the transmission controller; in,

The transmission controller is further configured to: when receiving a gear-in signal from the motor controller, control the gear-in actuator to perform a gear-in operation with a constant gear-in force, detect whether the gear-in operation is successful, and send a gear-in The success signal or the gear failure signal is sent to the motor controller;

The motor controller is further configured to: when receiving the gear-engagement success signal from the transmission controller, control the motor to drive the vehicle to start, and when receiving the gear-engagement failure signal from the transmission controller, control the motor to drive The first shaft of the transmission turns an angle, and then sends the signal to engage the transmission again to the transmission controller.

The transmission controller may include a gear sensor for detecting the current gear of the transmission and sending the current gear signal to the motor controller. The angle by which the first shaft of the transmission is rotated is preferably determined by a pulse width modulated control signal output by a motor controller. The duty ratio of the pulse width modulation control signal is preferably 5%-10%; the loading time of the pulse width modulation control signal is preferably 10 milliseconds-100 milliseconds.

Therefore, using the gearing system of the present invention, after the gearing actuator fails to be geared, the motor controller outputs a pulse width modulation control signal to the motor, and selects an appropriate duty cycle and loading time, so that the gearing can be performed in a short time. Combining gears repeatedly until the gearing is successful, so there will be no vibration and noise, and no damage to the transmission.

Other additional technical features of the gear-in-gear control system of the present invention are the same as the above-mentioned additional technical features for the gear-in-gear method, so no repeated description is given.

Claims (10)

1. A clutchless method for engaging gears when a vehicle starts, the method comprising the steps of: (a) detect the current gear of the transmission; (b) Determine whether the current gear of the transmission is in the target gear, if it is in the target gear, control the motor to drive the vehicle to start, if not in the target gear, perform the following steps; (c) Control the gear closing actuator to perform the gear closing operation with a constant gear closing force; (d) Detect whether the gearing operation in step (c) is successful, if the gearing is successful, control the motor to drive the vehicle to start, if the gearing fails, control the motor to drive the first shaft of the transmission to rotate an angle, and then stop motor; (e) Repeat steps (c)-(d) above until the transmission is successfully engaged and the motor drives the vehicle to start. 2. The clutchless gear engaging method according to claim 1, wherein the angle at which the first shaft of the transmission rotates is determined by a pulse width modulated control signal output from a motor controller. 3. The clutchless gear-engaging method according to claim 2, wherein the duty cycle of the pulse width modulation control signal is 5% to 10%; the loading time of the pulse width modulation control signal is 10 milliseconds to 100 milliseconds . 4. The method of clutchless gear engagement according to claim 1, wherein the transmission is a mechanical automatic transmission. 5. The clutchless gear engaging method according to claim 4, wherein the gear engaging actuator is driven by a gear engaging motor. 6. A clutchless gear-engagement control system when the vehicle starts, the system comprising: a transmission controller configured to signal the current gear position of the transmission to the motor controller; and The motor controller is configured to receive the current gear signal and determine whether the current gear is in the target gear according to the current gear signal. If it is in the target gear, control the motor to drive the vehicle to start. If it is not in the target gear, send gear signal to the transmission controller; Wherein, the transmission controller is further configured to: when receiving the gear-in-gear signal from the motor controller, control the gear-in-gear actuator to perform the gear-in operation with a constant gear-in force, detect whether the gear-in operation is successful, and send Gear-up success signal or gear-up failure signal to motor controller; The motor controller is further configured to: when receiving the gear-engagement success signal from the transmission controller, control the motor to drive the vehicle to start, and when receiving the gear-engagement failure signal from the transmission controller, control the motor to drive The first shaft of the transmission turns an angle, then stops the motor, and again sends the gear-in signal to the transmission controller. 7. The clutchless gear engagement control system according to claim 6, wherein the transmission controller includes a gear position sensor for detecting the current gear position of the transmission, and sending the current gear position signal to the motor controller. 8. The clutchless engagement control system of claim 6, wherein the angle by which the first shaft of the transmission rotates is determined by a pulse width modulated control signal output from a motor controller. 9. The clutchless gear engagement control system according to claim 8, wherein the duty ratio of the pulse width modulation control signal is 5% to 10%; the loading time of the pulse width modulation control signal is 10 milliseconds to 100 milliseconds millisecond. 10. The clutchless engagement control system of claim 6, wherein the transmission is a mechanical automatic transmission.

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