WO2014173206A1

WO2014173206A1 - Multi-power source coordinated control method in gear shifting process of hybrid automobile

Info

Publication number: WO2014173206A1
Application number: PCT/CN2014/072703
Authority: WO
Inventors: 周宇星; 朱军; 赵沂; 顾铮珉; 张鹏君; 马成杰
Original assignee: 上海汽车集团股份有限公司
Priority date: 2013-04-25
Filing date: 2014-02-28
Publication date: 2014-10-30
Also published as: CN104118421A

Abstract

A multi-power source coordinated control method in the gear shifting process of a hybrid automobile; the power of each power source is respectively coupled to a gearbox input shaft (7) via respective clutches (51, 52) of a first power source end (1) and a second power source end (2), and is transferred to a constant meshing gear (6) of a corresponding gear via a synchronizer (4), and then transferred to the vehicle wheels through a gearbox output shaft (8) and then through the gear. The method comprises the steps of: a TCU receives a signal instruction of a gear required by the automobile; transmitting a torque reduction instruction to each power source and determining whether the torque is reduced to be within a target torque range; transmitting instructions for clutch release and synchronizer moving, and for each power source end to adjust speed; when determining that the synchronizer is in place and each power source end has completed speed adjustment, transmitting instructions for clutch engagement, and for each power source end to increase torque, and determining whether the torque is increased to be within a target torque range, thus completing gear shifting. The present invention subdivides torque control at each control stage in a gear shifting process, optimizes torque increase and reduction by each power source, and avoids jerking and bumping caused by inconsistency or rapid change of torque.

Description

Coordinated control method for multiple power sources in shifting process of hybrid vehicle

The invention relates to a shifting control method for an automobile gearbox, in particular to a coordinated control method for multiple power sources in a shifting process of a hybrid vehicle. Background technique

In the prior art, the traditional shifting process mostly adopts a single power source control method, and the process of reducing the twisting and speed regulation is relatively simple, and the requirements for the control precision are not high; or, the dual power source control is adopted, but the power is used. The sources are placed on the same side of the gearbox for closed-loop control of torque or speed. However, for multi-power source systems, it is necessary to consider the situation that they are arranged on both sides of the gearbox, so as to coordinate the torque and speed of these power source systems, so as to ensure the smoothness of the power lifting and twisting, and to ensure Accurate speed control, but also ensure that the shift time can not be too long. In particular, during the shifting process of the hybrid vehicle, the coordinated control process of the plurality of power sources will involve the down-down phase of each power source directly coupled with the transmission mechanism at the start of the shift, and after the torque reduction completion clutch is opened The speed control phase of each power source and the torsion and twisting phase of each power source after the speed regulation is completed, the whole control process is quite complicated. If the control is improper, the torque will not be smooth or the rate of change will be too fast, which will cause the setback and impact, and the speed adjustment time will pass. Long, inaccurate speed regulation, damage to the clutch, affecting driving safety and many other issues. Summary of the invention

In view of the above, the main object of the present invention is to provide a coordinated control method for a multi-power source in a shifting process of a hybrid vehicle, in order to solve the above problems and other problems in the prior art.

In order to achieve the above object of the invention, the present invention adopts the following technical solutions:

A coordinated control method for multiple power sources in a shifting process of a hybrid vehicle, wherein power of each power source is coupled to a gearbox input shaft through respective clutches of the first power source end and the second power source end, and transmitted via a synchronizer The constant meshing gear to the corresponding gear is then transmitted to the wheel through the transmission output shaft, and the coordinated control method of the multi-power source in the shifting process of the hybrid vehicle includes the following steps:

A. Receive the vehicle demand gear signal command from the gearbox control unit TCU and determine if it is needed To perform a shift: If yes, proceed to step B;

B. The first power source end and the second power source end torque reduction command are sent by the transmission control unit TCU;

C. determining whether the torques of the first power source end and the second power source end have both decreased to respective target torque ranges and thereafter continue for at least a predetermined first time threshold: if yes, perform step D; otherwise, Return to step B;

D. The transmission control unit TCU issues an instruction to open each clutch and move the synchronizer, and simultaneously issue a first power source end and a second power source end speed control command;

E. judging whether the synchronizer is moved in position, and determining whether the respective rotational speeds of the first power source end and the second power source end have reached the respective speed target speed ranges and thereafter last at least a predetermined second time threshold: If yes, go to step F; otherwise, return to step D;

F. issued by the transmission control unit TCU to close the clutches and the first power source end and the second power source end torque command;

G. determining whether the respective torques of the first power source end and the second power source end have risen to the target torque range and thereafter continuing for at least a predetermined third time threshold: if yes, completing the entire shifting process; , Back to the steps? .

In the coordinated control method of the multi-power source in the above-described hybrid vehicle shifting process, optionally, the first power source end and the second power source end torque reduction command are such that the torque is smoothly decreased according to a preset target slope.

In the coordinated control method of the multi-power source in the above-described hybrid vehicle shifting process, optionally, when the first power source end is provided with at least two power sources, the target descent torque achieved according to the target slope is The power source with a slow torque response is preferentially detonated between the at least two power sources, and then distributed by the principle that the power source with fast torque response complements.

In the coordinated control method of the multi-power source in the above-described hybrid vehicle shifting process, optionally, when the second power source end is provided with at least two power sources, the target descent torque achieved according to the target slope is The power source with a slow torque response is preferentially detonated between the at least two power sources, and then distributed by the principle that the power source with fast torque response complements.

In the coordinated control method of the multi-power source in the shifting process of the hybrid vehicle, optionally, the first power source end and the second power source end speed control command are torque-controlled according to the speed closed loop, and the target speed is Both are obtained based on the actual rotational speed of the output shaft of the transmission.

In the above coordinated control method of the multi-power source in the shifting process of the hybrid vehicle, optionally, When the first power source end is provided with at least two power sources, only one of the power sources is allowed to adopt PID adjustment for speed control, and the torque requests of the remaining power sources are all 0Nm.

In the coordinated control method of the multi-power source in the above-described hybrid vehicle shifting process, optionally, when the second power source end is provided with at least two power sources, wherein only one of the power sources is allowed to adopt PID adjustment For speed control, the torque request of the remaining power sources is 0Nm.

In the coordinated control method of the multi-power source in the above-described hybrid vehicle shifting process, optionally, the first power source end and the second power source end raising torque command are such that the torque is smoothly increased according to a preset target slope.

In the coordinated control method of the multi-power source in the above-described hybrid vehicle shifting process, optionally, when the first power source end is provided with at least two power sources, the target rising torque achieved according to the target slope is The at least two power sources are preferentially increased in torque according to a power source with a slow torque response, and then distributed by a principle that the power source with a fast torque response complements.

In the coordinated control method of the multi-power source in the above-described hybrid vehicle shifting process, optionally, when the second power source end is provided with at least two power sources, the target descent torque achieved according to the target slope is The at least two power sources are preferentially increased in torque according to a power source with a slow torque response, and then distributed by a principle that the power source with a fast torque response complements.

The beneficial effects of the present invention are as follows: The coordinated control method of the multi-power source in the shifting process of the hybrid vehicle of the present invention can subdivide the torque control of each control stage in the shifting process, and effectively optimizes under the premise of meeting the shifting demand. During the shifting process, the power source raises and lowers the torque, avoids the setback and impact caused by the torque irregularity or the rate of change too fast, and can optimize the power source speed regulation during the shifting process, avoiding the regulation time being too long or the speed regulation is not allowed to cause the clutch to combine the jitter. This helps to extend the life of components such as clutches and improve driving safety. DRAWINGS

The technical solutions of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a block diagram showing an exemplary structure of a multi-power source coordinated control using a coordinated control method of a multi-power source in a shifting process of a hybrid vehicle of the present invention.

2 is a schematic flow chart of an embodiment of a coordinated control method for multiple power sources in a shifting process of a hybrid vehicle according to the present invention. detailed description It should be noted that the principles, features and advantages of the coordinated control method of the multi-power source in the shifting process of the hybrid vehicle of the present invention will be exemplified below, but all the descriptions are only for explanation, and They should be understood as forming any limitation on the invention. In addition, any single technical feature described or implied in the various embodiments referred to herein, or any single technical feature shown or implied in the various figures, may still be in the technical features (or equivalent thereof) Any combination or singulation continues between the items to obtain further embodiments of the invention that may not be directly mentioned herein.

The coordinated control method of the multi-power source in the shifting process of the hybrid vehicle of the present invention will be specifically described below with reference to Figs. 1 and 2. In Fig. 1, it schematically shows, by way of example, a component structure of an object to which the method of the present invention is applied. As shown in FIG. 1, the powers of the first power source end 1 and the second power source end 2 are respectively coupled to the transmission input shaft 7 through the respective clutches 51, 52, and are transmitted to the corresponding gears through the synchronizer 4 The gear 6 is meshed and then transmitted to the wheel 3 through the gearbox output shaft 8.

Referring to FIG. 2, in this embodiment, the method of the present invention comprises the following steps:

First, it is judged in step S10 whether or not the condition 1 is satisfied: that is, the transmission control unit TCU receives the vehicle demand range signal command, and then determines whether or not shifting is required.

If it is determined that shifting is required, then in step S11, the gear reduction control command TCU issues a torque reduction command to the first power source end 1 and the second power source end 2; otherwise, no control operation is performed.

Next, it is determined in step S12 whether condition 2 is satisfied: that is, whether the torque of the first power source end 1 has decreased to its target torque range, and whether the torque of the second power source end 2 has decreased to its target torque range, And they have also continued for at least a predetermined first time threshold (t_minl) after being reduced to their respective target torque ranges.

If it is determined that these conditions in Condition 2 have been met, then in step S13, an instruction to open each of the clutches 51, 52 and move the synchronizer 4 is issued by the transmission control unit TCU while simultaneously moving to the first power source terminal 1 and the second power source The source terminal 2 issues a speed control command; otherwise, returns to the above step S11.

Then, it is determined in step S14 whether condition 3 is satisfied: that is, whether the synchronizer 4 is moved in position, and whether the rotational speed of the first power source end 1 has reached the speed target speed range thereof, and whether the rotational speed of the second power source end 2 has After reaching the speed target speed range, and their speed has reached at least the predetermined second time threshold after reaching the respective speed target speed range Value (t_min2).

If it is determined that these conditions in condition 3 have been met, then in step S15, the respective clutches 51, 52 and the first power source end 1 and the second power source end 2 lift torque command are issued by the transmission control unit TCU; otherwise, Returning to the above step S13.

Then, it is determined in step S16 whether condition 4 is satisfied: that is, whether the torque of the first power source end 1 has risen to its target torque range, whether the torque of the second power source end 2 has risen to its target torque range, and The torque also continues for at least a predetermined third time threshold (t_min3) after rising to the respective target torque range.

If it is determined that these conditions in Condition 4 have been met, the entire shifting process is completed; otherwise, the above step S15 is returned.

It should be noted that the coordinated control method of the multi-power source in the shifting process of the hybrid vehicle according to the present invention can further optimize or change some of the above technical features.

For example, in some embodiments, the torque command can be reduced by the first power source end 1 and the second power source end 2 such that the torque of each of the power source ends is smoothly reduced by a predetermined target slope. It can be understood that the target descent torque of each of the above power source ends may be related to the current driver's accelerator pedal opening degree and the torque response characteristics of the respective power sources.

Since more than one power source may be provided at each power source end, it is also preferable to appropriately allocate the target descent torque after the above target slope is determined. For example, for the first power source end 1, the power source with a slow torque response can be preferentially detonated, and then the target down torque can be distributed by the principle that the power source with fast torque response complements. As another example, for the second power source end 2, the above principle can also be used to allocate the target descent torque.

Similar to the above first power source end 1 and second power source end 2 torque reduction control processes, in some embodiments, the torque command can be raised by the first power source end 1 and the second power source end 2, such that The torque of each power source at the power source end rises steadily according to the preset target slope. It will be appreciated that the target ascent torque at these power source ends may be related to the current driver's accelerator pedal opening and the torque response characteristics of each power source. In addition, when the first power source end 1 (or the second power source end 2) is provided with more than two power sources, it may be preferable to preferentially increase the torque according to the power source with a slow torque response, and then perform the power source with a fast torque response. The principle of complementation is to perform a target ascending torque distribution between these power sources in the first power source end 1 (or the second power source end 2).

By way of further example, in some embodiments, the first power source end 1 and the second power source end 2 The speed regulation command is to perform torque regulation of each power source according to the speed closed loop. The target rotation speeds of the first power source end 1 and the second power source end 2 are all obtained based on the actual rotation speed of the transmission output shaft 8. Optionally, when the first power source end 1 is provided with more than two power sources, only one of the power sources is allowed to adopt PID adjustment for speed control, and the rest of the power source torque requests are 0Nm, thereby avoiding The torque fluctuation during the speed regulation process ensures that the speed regulation process is fast and stable. Optionally, when the second power source end 2 is provided with more than two power sources, it may also adopt the above setting manner.

The specific embodiments are exemplified above to clarify the coordinated control method of the multi-power source in the shifting process of the hybrid vehicle of the present invention. These examples are only for explaining the principle of the present invention and its implementation, rather than limiting the present invention. Various modifications and improvements can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, all equivalent technical solutions are intended to be within the scope of the invention and are defined by the claims of the invention.

Claims

Rights request

A coordinated control method for multiple power sources in a shifting process of a hybrid vehicle, wherein power of each power source is coupled to a gearbox input shaft through respective clutches of the first power source end and the second power source end, and is synchronized The gear is transmitted to the gear of the corresponding gear and then transmitted to the wheel through the gearbox output shaft. The coordinated control method of the multi-power source in the shifting process of the hybrid vehicle includes the following steps:

A. The gearbox control unit TCU receives the vehicle demand gear signal command and determines whether a shift is required: If yes, proceed to step B;

F. issuing, by the transmission control unit TCU, closing the clutches and the first power source end and the second power source end torque command;

2 . The coordinated control method for multiple power sources in a shifting process of a hybrid vehicle according to claim 1 , wherein the first power source end and the second power source end reduce torque command are such that the torque is preset. The slope of the target is steadily decreasing.

3 . The coordinated control method for multiple power sources in a shifting process of a hybrid vehicle according to claim 2 , wherein when the first power source end is provided with at least two power sources, according to the target slope The achieved target descent torque preferentially lowers the torque between the at least two power sources according to the power source with a slow torque response, and then the principle of complementing the power source with fast torque response Line assignment.

4. The coordinated control method for multiple power sources in a shifting process of a hybrid vehicle according to claim 2, wherein when the second power source end is provided with at least two power sources, according to the target slope The achieved target descent torque is preferentially decelerated between the at least two power sources according to a power source with a slow torque response, and then distributed by the principle that the power source with fast torque response complements.

5 . The coordinated control method for multiple power sources in a shifting process of a hybrid vehicle according to claim 1 , wherein the first power source end and the second power source end speed control command are torque according to a speed closed loop. For speed regulation, the target speed is obtained based on the actual speed of the output shaft of the transmission.

6 . The coordinated control method for multiple power sources in a shifting process of a hybrid vehicle according to claim 5 , wherein when the first power source end is provided with at least two power sources, only one of them is allowed The power source adopts PID adjustment for speed control, and the torque requests of other power sources are 0Nm.

7. The coordinated control method for multiple power sources in a shifting process of a hybrid vehicle according to claim 5, wherein when the second power source end is provided with at least two power sources, only one of them is allowed The power source adopts PID adjustment for speed control, and the torque requests of other power sources are 0Nm.

8 . The coordinated control method for multiple power sources in a shifting process of a hybrid vehicle according to claim 1 , wherein the first power source end and the second power source end torque command are such that the torque is preset. The slope of the target rises steadily.

9 . The coordinated control method for multiple power sources in a shifting process of a hybrid vehicle according to claim 8 , wherein when the first power source end is provided with at least two power sources, according to the target slope The achieved target ascending torque is preferentially increased between the at least two power sources according to a power source with a slow torque response, and then distributed by a principle that the power source with a fast torque response complements.

10 . The coordinated control method for multiple power sources in a shifting process of a hybrid vehicle according to claim 8 , wherein when the second power source end is provided with at least two power sources, according to the target slope The achieved target descent torque is preferentially increased by the power source with a slow torque response between the at least two power sources, and then distributed by the principle that the power source with fast torque response complements.