JP7090984B2 - Shift support methods and equipment for hybrid vehicles - Google Patents

Description

The present invention relates to a shift support method and a device for a hybrid vehicle.

In recent years, the rise of hybrid vehicles that use both an engine and a motor generator has been remarkable, but this type of hybrid vehicle is called a parallel type that has a clutch that can connect and disconnect power between the engine and the motor generator. The energy generated when the vehicle decelerates is recovered and stored by the charge control of the motor generator, and the engine power is torque-assisted by the discharge control of the motor generator to reduce the load on the engine. There is.

In such a parallel type hybrid vehicle, a mechanical transmission is connected to the rear stage of the motor generator, and the operation of this mechanical transmission is automated together with the clutch operation to automatically shift the speed only by the driver's accelerator operation. However, in such a parallel type hybrid vehicle, when shifting up or down in the mechanical transmission, the output after gear removal in the mechanical transmission is performed. It is proposed that the rotation speed of the shaft is detected, the target rotation speed at which the input shaft can be geared is obtained by the control device based on this, and the motor generator assists the rotation speed of the input shaft to match the target rotation speed. Has been done.

The prior art document information related to the present invention includes, for example, the following Patent Document 1 and Patent Document 2.

Japanese Unexamined Patent Publication No. 6-241300 Japanese Unexamined Patent Publication No. 2007-69787

However, when shifting under driving conditions such as steep climbs and descents, the vehicle speed suddenly decelerates or accelerates due to the gear neutral state and torque transmission disappears, and the rate of change in the number of revolutions on the output shaft increases. Therefore, the rotation speed of the output shaft changes greatly from moment to moment until the rotation control (rotation adjustment) of the input shaft by the motor generator reaches the target rotation speed, and the rotation speed of the motor generator and the target rotation speed are changed. There was a risk that a certain steady deviation would occur between them and mutual convergence would not be possible, making it impossible to complete the shift.

For example, to explain the control of rotation adjustment in shifting on a steep slope by the graph of FIG. 5, the target rotation speed is obtained every moment by the control device based on the rate of change of the rotation speed of the output shaft of the mechanical transmission and decreases. On the other hand, the rotation control of the motor generator is carried out aiming at the target rotation speed at a certain point in time, but the rotation speed of the motor generator having poor response to the target rotation speed that decreases in advance cannot catch up. , The target rotation speed and the rotation speed of the motor generator may decrease with a constant steady deviation, and the shift may not be completed.

For this reason, in the past, the actual situation was to control so that shifting would not be performed under driving conditions such as steep climbs and descents, but such steep climbs and descents. Of course, there is a need for technical measures that can quickly complete shifting even under driving conditions.

The present invention has been made in view of the above circumstances, and the input shaft of the mechanical transmission is used even under traveling conditions such as sudden deceleration or sudden acceleration of the vehicle speed during shifting such as a steep climb or a steep descent. The purpose is to achieve the rotation adjustment between the output shaft and the output shaft in a short time so that the shift can be completed quickly.

In the present invention, the motor generator and the mechanical transmission are sequentially connected to the engine via a clutch, and the motor generator adjusts the rotation of the input shaft and the output shaft of the mechanical transmission when the mechanical transmission is changed. It is a shift support method for a hybrid vehicle that is assisted by the above method, in which a target rotation speed that can be geared is obtained based on the rotation speed of the output shaft, and the target rotation speed is used as an instruction value to the motor generator of the motor generator. In controlling the rotation speed, when the rotation speed of the output shaft after gear removal in the mechanical transmission falls or rises beyond a predetermined rate of change, it is determined that the speed is suddenly decelerated or suddenly accelerated, and the speed is suddenly reduced. When it is determined that the motor generator has a rotation speed higher than the target rotation speed, the indicated value to the motor generator is switched to an offset rotation speed lower than the target rotation speed, and when it is determined that the motor is rapidly accelerated, the motor is determined. Under the condition that the rotation speed of the generator is lower than the target rotation speed, the indicated value to the motor generator is switched to the offset rotation speed higher than the target rotation speed to control the rotation speed of the motor generator, and the rotation speed of the motor generator is the target. It is characterized in that when it approaches within a specified range with respect to the rotation speed, the indicated value is returned from the offset rotation speed to the target rotation speed, and the rotation speed of the motor generator is converged to the target rotation speed.

Therefore, in this way, under driving conditions such as a steep climb or a steep descent where the vehicle speed suddenly decelerates or accelerates suddenly, the sudden deceleration is performed based on the rate of change in the rotation speed of the output shaft. If it is determined that there is, the rotation speed of the motor generator is switched to an offset rotation speed lower than the target rotation speed, and on the contrary, if it is determined that the acceleration is rapid, the rotation speed of the motor generator is determined. Is switched to an offset rotation speed higher than the target rotation speed, so that in either case, the motor generator is instructed to rotate extra in the direction in which the rotation speed of the output shaft changes, and the convergence to the target rotation speed is accelerated.

At this time, when the indicated value is returned from the offset rotation speed to the target rotation speed when the rotation speed of the motor generator approaches the specified range with respect to the target rotation speed, the rotation speed of the motor generator converges to the target rotation speed. The rotation of the input shaft and the output shaft of the mechanical transmission are matched, and the gear shift can be completed by gearing.

It should be noted that switching to the offset rotation speed as described above is performed only under the condition that the rotation speed of the motor generator is higher than the target rotation speed at the time of sudden deceleration, and under the condition that the rotation speed of the motor generator is lower than the target rotation speed at the time of sudden acceleration. The reason why only the rotation is performed is that the rotation speed of the motor generator converges to the offset rotation speed and the rotation adjustment cannot be performed.

Further, as a device for specifically implementing the above-mentioned method of the present invention, the motor generator and the mechanical transmission are sequentially connected to the engine via a clutch, and the mechanical transmission is changed when the mechanical transmission is changed. It is a speed change support device of a hybrid vehicle in which the rotation adjustment of the input shaft and the output shaft of the above is assisted by the motor generator, and is based on a rotation sensor that detects the rotation speed of the output shaft and a detection value of the rotation sensor. A control device for obtaining a target rotation speed of a gear-insertable input shaft and controlling the rotation speed of the motor generator using the target rotation speed as an instruction value to the motor generator is provided, and the control device is a rotation sensor of the rotation sensor. Based on the detected value, when the rotation speed of the output shaft after gear removal in the mechanical transmission falls or rises beyond a predetermined rate of change, it is determined to be sudden deceleration or sudden acceleration, and it is determined to be sudden deceleration. At that time, under the condition that the rotation speed of the motor generator is higher than the target rotation speed, the instruction value to the motor generator is switched to the offset rotation speed lower than the target rotation speed, and when it is determined that the acceleration is rapid, the rotation of the motor generator is performed. Under the condition that the number is lower than the target rotation speed, the indicated value to the motor generator is switched to the offset rotation speed higher than the target rotation speed to control the rotation speed of the motor generator, and the rotation speed of the motor generator becomes the target rotation speed. On the other hand, it is preferable to adopt one that is configured to return the indicated value from the offset rotation speed to the target rotation speed and converge the rotation speed of the motor generator to the target rotation speed when approaching within the specified range.

According to the shift support method and device of the hybrid vehicle of the present invention described above, the rotation of the output shaft is rotated even under driving conditions such as sudden deceleration or sudden acceleration of the vehicle speed during shifting such as a steep uphill or a steep descent. By instructing the motor generator to rotate extra in the direction in which the number changes, it is possible to accelerate the convergence to the target rotation speed, which enables the rotation adjustment of the input shaft and output shaft of the mechanical transmission to be adjusted in a short time. It can have the excellent effect of being able to accomplish and complete the shift quickly.

It is a schematic diagram which shows an example of the embodiment of this invention. It is a flowchart which shows the specific control procedure in the control apparatus of FIG. It is a graph which shows the switching image of the indicated value at the time of sudden deceleration. It is a graph which shows the switching image of the indicated value at the time of sudden acceleration. It is a graph explaining the control of rotation adjustment in the shift change in a steep slope.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an example of an embodiment of the present invention, in which a motor generator 3 and a mechanical transmission 4 are sequentially connected to an engine 1 via a clutch 2, and the machine is connected at the time of shifting the mechanical transmission 4. A hybrid vehicle in which the rotation matching between the input shaft 5 and the output shaft 6 of the type transmission 4 is assisted by the motor generator 3 is schematically shown, and the output of the output shaft 6 is via the differential gear 7. It is transmitted to the drive wheel 8.

Here, in the hybrid vehicle, the rotation speed of the rotation sensor 9 that detects the rotation speed of the output shaft 6 and the target rotation speed of the input shaft 5 that can be geared are obtained based on the detection value of the rotation sensor 9, and the target rotation speed is obtained. A control device 10 for controlling the rotation speed of the motor generator 3 is provided with the number as an instruction value to the motor generator 3.

Then, the control device 10 suddenly decelerates or rises when the rotation speed of the output shaft 6 after gear removal in the mechanical transmission 4 decreases or increases beyond a predetermined rate of change based on the detection value of the rotation sensor 9. When it is determined that the acceleration is sudden and the deceleration is sudden, the indicated value to the motor generator 3 is set to the offset rotation speed lower than the target rotation speed under the condition that the rotation speed of the motor generator 3 is higher than the target rotation speed. I am trying to switch to.

Further, when it is determined that the acceleration is sudden, the instruction value to the motor generator 3 is switched to an offset rotation speed higher than the target rotation speed under the condition that the rotation speed of the motor generator 3 is lower than the target rotation speed, and the motor generator is used. The number of rotations of 3 is controlled.

Moreover, when the rotation speed of the motor generator 3 approaches the specified range with respect to the target rotation speed, the indicated value is returned from the offset rotation speed to the target rotation speed so that the rotation speed of the motor generator 3 is converged to the target rotation speed. It is set to.

FIG. 2 shows a specific control procedure in the control device 10 in a flowchart. First, in step S1, whether or not the sudden deceleration or rapid acceleration exceeds a predetermined rate of change based on the detection value of the rotation sensor 9. When it is determined that the vehicle is suddenly decelerated, the process proceeds to step S2 to start the rotation adjustment at the time of sudden deceleration. If it is neither sudden deceleration nor sudden acceleration, the process proceeds to step S4 and the normal rotation adjustment is started.

Here, an appropriate hysteresis is set for the determination of sudden deceleration or sudden acceleration based on the detection value of the rotation sensor 9 in step S1, and the threshold value of the rate of change used for the determination is set to have a range, and the output shaft 6 is used. It is good to be able to avoid the phenomenon that the judgment is frequently overturned by the change rate of the number of rotations of the above moving around the threshold value.

Then, when the rotation adjustment at the time of sudden deceleration is started in step S2, it is determined in the next step S5 whether or not the rotation speed of the motor generator 3 is higher than the target rotation speed, and only when it is high, the process proceeds to step S6. The value indicated to the motor generator 3 is switched to an offset rotation speed lower than the target rotation speed.

As a result, control is executed with the instructed value to the motor generator 3 as the offset rotation speed, and the rotation speed of the motor generator 3 rapidly decreases to approach the target rotation speed. Therefore, in the next step S7, the motor generator 3 It is determined whether or not the rotation speed has approached the specified range with respect to the target rotation speed, and if it is determined that the rotation speed has approached the specified range, the process proceeds to step S8 and the indicated value is returned from the offset rotation speed to the target rotation speed. In step S9, the rotation speed of the motor generator 3 converges to the target rotation speed, and gearing becomes possible. The determination in step S7 is repeated until the rotation speed of the motor generator 3 approaches the specified range with respect to the target rotation speed in the determination in step S7.

Further, when the rotation adjustment at the time of sudden acceleration is started in step S3, it is determined in the next step S10 whether or not the rotation speed of the motor generator 3 is lower than the target rotation speed, and only when it is low, the process proceeds to step S11. The value indicated to the motor generator 3 is switched to an offset rotation speed higher than the target rotation speed.

As a result, control is executed with the instructed value to the motor generator 3 as the offset rotation speed, and the rotation speed of the motor generator 3 rapidly increases and approaches the target rotation speed. Therefore, in the next step S12, the motor generator 3 It is determined whether or not the rotation speed has approached the specified range with respect to the target rotation speed, and if it is determined that the rotation speed has approached the specified range, the process proceeds to step S13 and the indicated value is returned from the offset rotation speed to the target rotation speed. In step S9, the rotation speed of the motor generator 3 converges to the target rotation speed, and gearing becomes possible. The determination in step S12 is repeated until the rotation speed of the motor generator 3 approaches the specified range with respect to the target rotation speed in the determination in step S12.

On the other hand, when the normal rotation adjustment is started in step S4, the target rotation number of the input shaft 5 that can be geared based on the rotation number of the output shaft 6 detected by the rotation sensor 9 as before in step S14. Is obtained by the control device 10, and control of the rotation speed of the motor generator 3 is executed using the target rotation speed as an instruction value to the motor generator 3, and the rotation speed of the motor generator 3 is the target rotation in step S9. Gearing is possible after converging on the number, but even if a NO determination is made in step S5 during sudden deceleration or step S10 during sudden acceleration, the process proceeds to step S14 and normal control is performed.

In step S5 and step S10 described above, switching to the offset rotation speed is performed only under the condition that the rotation speed of the motor generator 3 is higher than the target rotation speed at the time of sudden deceleration, and the rotation speed of the motor generator 3 is changed at the time of sudden acceleration. The reason why it is performed only under the condition lower than the target rotation speed is that if it is not performed only under such condition, the rotation speed of the motor generator 3 will converge to the offset rotation speed and the rotation can be adjusted. Because it will disappear.

Further, FIG. 3 is a graph showing an image of switching the indicated value at the time of sudden deceleration. For example, when a shift is made during a steep climb, the vehicle speed drops sharply due to the gradient and the rotation speed of the output shaft 6 also increases. Since the rotation speed drops significantly, the target rotation speed that can be geared, which is calculated every moment by the control device 10 based on the rotation speed of the output shaft 6, also drops significantly, but the control device 10 suddenly decelerates. Since the rotation speed of the motor generator 3 is controlled by switching the instruction value to the motor generator 3 to an offset rotation speed lower than the target rotation speed, the rotation speed of the motor generator 3 is the original target. The indicated value is returned from the offset rotation speed to the target rotation speed when the engine speed drops sharply toward an offset rotation speed lower than the rotation speed and approaches the target rotation speed, and when the target rotation speed approaches the specified range. The rotation speed of the generator 3 will converge to the target rotation speed within a short time.

Further, FIG. 4 is a graph showing an image of switching the indicated value at the time of sudden acceleration. For example, when a shift is made during a sudden descent, the vehicle speed suddenly increases due to the gradient and the rotation speed of the output shaft 6 is increased. The target rotation speed that can be geared, which is calculated every moment by the control device 10 based on the rotation speed of the output shaft 6, will also increase significantly, but the control device 10 suddenly increases. Since it is determined that the vehicle is accelerating and the indicated value to the motor generator 3 is switched to an offset rotation speed higher than the target rotation speed to control the rotation speed of the motor generator 3, the rotation speed of the motor generator 3 is the original rotation speed. The indicated value is returned from the offset rotation speed to the target rotation speed when the rotation speed is rapidly increased toward the target rotation speed higher than the target rotation speed and approaches the target rotation speed, and when the target rotation speed is within the specified range. The rotation speed of the motor generator 3 will converge to the target rotation speed within a short time.

As described above, according to the example of the present embodiment, the change in the number of revolutions of the output shaft 6 is changed even under the running conditions such as sudden deceleration or sudden acceleration of the vehicle speed during shifting such as a steep climb or a steep descent. When it is determined that the deceleration is sudden based on the rate, the rotation speed of the motor generator 3 is switched to an offset rotation speed lower than the target rotation speed, and on the contrary, when it is determined that the acceleration is sudden. Can switch the rotation speed of the motor generator 3 to an offset rotation speed higher than the target rotation speed to perform rotation adjustment, and in either case, extra rotation of the motor generator 3 in the direction in which the rotation speed of the output shaft 6 changes. By instructing, the convergence to the target rotation speed can be accelerated, so that the rotation adjustment between the input shaft 5 and the output shaft 6 of the mechanical transmission 4 can be achieved in a short time, and the shift can be completed quickly. be able to.

It should be noted that the shift support method and device for the hybrid vehicle of the present invention are not limited to the above-mentioned embodiment, and of course, various changes can be made without departing from the gist of the present invention.

1 Engine 2 Clutch 3 Motor generator 4 Mechanical transmission 5 Input shaft 6 Output shaft 9 Rotation sensor 10 Control device

Claims (2)

The motor generator and the mechanical transmission are sequentially connected to the engine via a clutch, and the motor generator assists the rotation adjustment between the input shaft and the output shaft of the mechanical transmission when the mechanical transmission is changed. This is a shift support method for hybrid vehicles.
After removing the gear in the mechanical transmission , the target rotation speed that can be geared is obtained based on the rotation speed of the output shaft, and the rotation speed of the motor generator is controlled by using the target rotation speed as an instruction value to the motor generator. When the rotation speed of the output shaft of the When the indicated value to the motor generator is switched to an offset rotation speed lower than the target rotation speed under high conditions and it is determined that the motor is rapidly accelerating, the motor generator rotation speed is lower than the target rotation speed. The indicated value to is switched to an offset rotation speed higher than the target rotation speed to control the rotation speed of the motor generator, and when the rotation speed of the motor generator approaches the specified range with respect to the target rotation speed, the offset rotation speed is changed to the target rotation speed. A shift support method for a hybrid vehicle, characterized in that the indicated value is returned to a number and the rotation speed of the motor generator is converged to the target rotation speed. The motor generator and the mechanical transmission are sequentially connected to the engine via a clutch, and the motor generator assists the rotation adjustment between the input shaft and the output shaft of the mechanical transmission when the mechanical transmission is changed. It is a shift support device for hybrid vehicles.
The rotation sensor that detects the rotation speed of the output shaft and the target rotation speed of the input shaft that can be geared based on the detection value of the rotation sensor are obtained, and the target rotation speed is used as an instruction value to the motor generator of the motor generator. Equipped with a control device to control the number of revolutions
Based on the detection value of the rotation sensor, the control device determines that sudden deceleration or rapid acceleration occurs when the rotation speed of the output shaft after gear removal in the mechanical transmission decreases or increases beyond a predetermined rate of change. Then, when it is determined that the deceleration is sudden, the indicated value to the motor generator is switched to the offset rotation speed lower than the target rotation speed under the condition that the rotation speed of the motor generator is higher than the target rotation speed, and the sudden acceleration is performed. When the determination is made , under the condition that the rotation speed of the motor generator is lower than the target rotation speed, the indicated value to the motor generator is switched to the offset rotation speed higher than the target rotation speed to control the rotation speed of the motor generator, and the motor is controlled. When the rotation speed of the generator approaches the specified range with respect to the target rotation speed, the indicated value is returned from the offset rotation speed to the target rotation speed, and the rotation speed of the motor generator is converged to the target rotation speed. A characteristic hybrid vehicle shift support device.

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