CN109552311B - Gear shifting control method of hybrid electric vehicle based on multi-mode brake - Google Patents
Gear shifting control method of hybrid electric vehicle based on multi-mode brake Download PDFInfo
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- CN109552311B CN109552311B CN201811431711.9A CN201811431711A CN109552311B CN 109552311 B CN109552311 B CN 109552311B CN 201811431711 A CN201811431711 A CN 201811431711A CN 109552311 B CN109552311 B CN 109552311B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W20/00—Control systems specially adapted for hybrid vehicles
- B60W20/30—Control strategies involving selection of transmission gear ratio
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2710/00—Output or target parameters relating to a particular sub-units
- B60W2710/10—Change speed gearings
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- Automation & Control Theory (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Hybrid Electric Vehicles (AREA)
Abstract
The invention provides a gear shifting control method of a hybrid electric vehicle based on a multi-mode brake, which comprises the steps that an oil pump motor raises the rotating speed to A, the current of a negative locking valve of the multi-mode brake is cancelled, the multi-mode brake is controlled to be in a bidirectional free state, then the torques of a small motor and a large motor are increased, the rotating speed of a first planet carrier is rapidly raised to be larger than B, then the current of a positive locking valve of the multi-mode brake is increased, the multi-mode brake is controlled to be in a reverse locking state, the torques of the small motor and the large motor are controlled simultaneously, the rotating speed of the first planet carrier is lowered to be lower than D according to a preset rate C, then the rotating speed of the first planet carrier is lowered to be lower than F according to a preset rate E, finally the torques of an engine and the large. The method can effectively solve the problem of gear shifting impact in the advancing process, plays the role of a multi-mode brake, shortens the response time of the torque of the whole vehicle and greatly improves the smoothness of the whole vehicle.
Description
Technical Field
The invention relates to the field of control of hybrid electric vehicles, in particular to a gear shifting control method of a hybrid electric vehicle based on a multi-mode brake.
Background
In the prior art, a multi-mode brake has a large influence on the gear shifting smoothness, in order to not influence the smoothness, the multi-mode brake is only used in a forward gear, a 1-gear starting gear and a reverse gear in an automatic gearbox, and the mode switching of the multi-mode brake is completed under the condition that the whole vehicle is static. In the process of moving the whole vehicle, a multi-mode brake is not used, and gear shifting is realized through other clutches and brakes, so that the brake is additionally added, the complexity of a hydraulic system is increased, the function that the multi-mode brake can bear larger torque is not exerted to the greatest extent, and the dynamic property and the economical efficiency of the vehicle are influenced.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a gear shifting control method of a hybrid electric vehicle based on a multi-mode brake, which can effectively solve the problem of gear shifting impact in the advancing process, play the role of the multi-mode brake, shorten the response time of the torque of the whole vehicle and greatly improve the smoothness of the whole vehicle.
The invention is realized by the following scheme:
a gear shifting control method of a hybrid electric vehicle based on a multi-mode brake is characterized in that: when the vehicle is in a hybrid low-speed running state and the second clutch C1 is in a locking state, whether a user needs to perform a rapid acceleration operation is judged, and if yes, the method comprises the following steps:
s1: the vehicle controller sends a preset oil pump motor rotating speed request threshold A to the oil pump motor controller through the CAN bus, the oil pump motor controller controls the oil pump motor to rapidly increase the rotating speed to the preset oil pump motor rotating speed request threshold A, and then step S2 is executed; the preset oil pump motor rotating speed request threshold value A is 1200-1500 rpm;
s2: the vehicle controller cancels the current of the negative direction locking valve of the multi-mode brake B1, controls the multi-mode brake B1 to be in a bidirectional free state, and then executes the step S3;
s3: the finished vehicle controller increases the torques of the large motor E1 and the small motor E2, rapidly increases the rotating speed of the first planet carrier PC1, and executes the step S4 when the finished vehicle controller detects that the rotating speed of the first planet carrier PC1 is greater than a preset first planet carrier rotating speed threshold B; wherein the preset first planet carrier rotating speed threshold B is 150-200 rpm;
s4: the vehicle controller increases the current of a forward locking valve of a multi-mode brake B1, controls a multi-mode brake B1 to be in a reverse locking state, controls the torques of a small motor E1 and a large motor E2, reduces the rotating speed of a first planet carrier PC1 according to a preset speed rate C, and executes a step S5 when the vehicle controller detects that the rotating speed of a first planet carrier PC1 is lower than a preset first planet carrier rotating speed threshold value D; wherein the predetermined rate C is 350 to 400rad/s2The preset first planet carrier rotating speed threshold value D is 40-50 rpm;
s5: the finished vehicle controller reduces the rotating speed of the first planet carrier PC1 according to a preset speed E, wherein the preset speed E is smaller than a preset speed C, and when the finished vehicle controller detects that the rotating speed of the first planet carrier PC1 is lower than a preset first planet carrier rotating speed threshold value F, the step S6 is executed; wherein the predetermined rate E is 150 to 200rad/s2The preset first planet carrier rotating speed threshold value F is 10-20 rpm;
s6: the vehicle controller increases the torque of an engine and a large motor E2 until a multi-mode brake B1 locked in the reverse direction locks a first planet carrier PC1 to realize gear shifting, and then the vehicle is in a hybrid large-torque driving running state.
And the basis for judging whether the user needs to perform the emergency acceleration operation is the current accelerator pedal and speed signal of the vehicle received by the vehicle control unit.
Compared with the prior art, the gear shifting control method of the hybrid electric vehicle based on the multi-mode brake has the following advantages:
1. the method is simple and feasible, the control of the state of the multi-mode brake B1 and the rotation speed of the first planet carrier PC1 are carried out simultaneously and do not affect each other, the problem of conflict between brake state control and rotation speed control is solved fundamentally, the gear shifting time of the hybrid electric vehicle is shortened to a greater extent, the whole vehicle controller can quickly respond to the torque request of the whole vehicle and calculate and distribute corresponding torque to the engine controller and the motor controller, the performance and the structural advantages of a hybrid electric system are fully exerted, meanwhile, in the whole process, no power interruption occurs, good smoothness of the gear shifting process of the vehicle is guaranteed, and the driving and riding comfort of the whole vehicle are improved;
2. the speed of the first planet carrier PC1 is controlled to be close to 0 firstly, fast and then slow by controlling the torques of the small motor E1 and the large motor E2, so that the shaking caused by the overlarge acceleration of the first planet carrier PC1 when the multi-mode brake B1 is locked is restrained, and meanwhile, the effect of protecting the multi-mode brake B1 is achieved;
3. the multi-mode brake B1 is used for realizing gear shifting in the driving process, the state of the multi-mode brake is controlled only by the gear shifting valve, and the advantages of short control time, quick response and simple control of the multi-mode brake are exerted;
4. the method has no special requirements on the clutch, the brake and the hydraulic system, only one hydraulic element of the multi-mode brake B1 is controlled to realize gear shifting, the difficulty is reduced, and the practicability is high;
5. the hybrid power system has the advantages of no need of additional hardware, less software adjustment, cost saving, lower requirement on the response time of the motor torque, no special requirement on an engine and a hydraulic system, direct application to the project of the hybrid system of the traditional engine, suitability for various hybrid power vehicles and wide application range.
Drawings
FIG. 1 is a schematic structural view of a hybrid transmission used in the present invention;
fig. 2 is a control flow chart of a shift control method of a hybrid electric vehicle based on a multi-mode brake.
Detailed Description
The present invention will be further described with reference to the following examples, but the present invention is not limited to the description of the examples.
The schematic structural diagram of the hybrid power transmission device used in the present invention is shown in fig. 1, and its main components include: the engine ICE is connected with the input shaft 1 and then respectively connected with a first planet carrier PC of the first single planet row PG through the first clutch C and connected with a second sun gear S of the second single planet row PG through the second clutch C, the large motor E is connected with the second sun gear S of the second single planet row PG, the small motor E is connected with the first sun gear S of the first single planet row PG, the multimode brake B locks the first planet carrier PC of the first single planet row PG, the brake B locks the first sun gear S of the first single planet row PG, the second gear ring R of the second single planet row PG is connected with the first planet carrier PC of the first single planet row PG, and the first gear ring R of the first single planet row PG is connected with the second planet carrier PC of the second single planet row PG And a main speed reducer 3 and a gearbox main speed reducer 3 are connected with a differential 2.
Example 1
A gear shifting control method of a hybrid electric vehicle based on a multi-mode brake is characterized in that a control flow chart is shown in fig. 2, when the vehicle is in a hybrid low-speed driving state and a second clutch C1 is in a locked state, whether a user needs to perform a rapid acceleration operation or not is judged according to a current accelerator pedal and vehicle speed signal of the vehicle received by a vehicle controller, and if yes, the steps are performed as follows:
s1: the vehicle controller sends a preset oil pump motor rotating speed request threshold A to the oil pump motor controller through the CAN bus, the oil pump motor controller controls the oil pump motor to rapidly increase the rotating speed to the preset oil pump motor rotating speed request threshold A, and then step S2 is executed; wherein the preset oil pump motor rotating speed request threshold A is 1500 rpm;
s2: the vehicle controller cancels the current of the negative direction locking valve of the multi-mode brake B1, controls the multi-mode brake B1 to be in a bidirectional free state, and then executes the step S3;
s3: the finished vehicle controller increases the torques of the large motor E1 and the small motor E2, rapidly increases the rotating speed of the first planet carrier PC1, and executes the step S4 when the finished vehicle controller detects that the rotating speed of the first planet carrier PC1 is greater than a preset first planet carrier rotating speed threshold B; wherein the preset first planet carrier rotating speed threshold B is 200 rpm;
s4: the vehicle controller increases the current of a forward locking valve of a multi-mode brake B1, controls a multi-mode brake B1 to be in a reverse locking state, controls the torques of a small motor E1 and a large motor E2, reduces the rotating speed of a first planet carrier PC1 according to a preset speed rate C, and executes a step S5 when the vehicle controller detects that the rotating speed of a first planet carrier PC1 is lower than a preset first planet carrier rotating speed threshold value D; wherein the predetermined rate C is 400rad/s2The preset first planet carrier rotating speed threshold D is 50 rpm;
s5: the finished vehicle controller reduces the rotating speed of the first planet carrier PC1 according to a preset speed E, wherein the preset speed E is smaller than a preset speed C, and when the finished vehicle controller detects that the rotating speed of the first planet carrier PC1 is lower than a preset first planet carrier rotating speed threshold value F, the step S6 is executed; wherein the preset speed E is 200rad/s2The preset first planet carrier rotating speed threshold value F is 10 rpm;
s6: the vehicle controller increases the torque of an engine and a large motor E2 until a multi-mode brake B1 locked in the reverse direction locks a first planet carrier PC1 to realize gear shifting, and then the vehicle is in a hybrid large-torque driving running state.
Example 2
A shift control method for a hybrid vehicle based on a multi-mode brake, which has substantially the same steps as those of the shift control method for a hybrid vehicle based on a multi-mode brake in embodiment 1, except that: in step S1, the preset oil pump motor speed request threshold a is 1200 rpm; in step S3, the preset first carrier rotation speed threshold B is 150 rpm; in step S4, the predetermined rate C is 350rad/S2The preset first planet carrier rotating speed threshold value D is 40 rpm; in step S5, the predetermined rate E is 150rad/S2The preset first planet carrier rotation speed threshold F is 20 rpm.
Claims (5)
1. A gear shifting control method of a hybrid electric vehicle based on a multi-mode brake is characterized in that: the hybrid power transmission device comprises an engine, a small motor (E1), a large motor (E2), a first single planet row, a second single planet row, a first clutch (C0), a second clutch (C1), a multi-mode brake (B1), a brake (B2), a gearbox main reducer and a differential, wherein the engine is connected with an input shaft and then is respectively connected with a first planet carrier (PC1) of the first single planet row through a first clutch (C0) and a second sun gear of the second single planet row through a second clutch (C1), the large motor (E2) is connected with the second sun gear of the second single planet row, the small motor (E1) is connected with the first sun gear of the first single planet row, the multi-mode brake (B1) locks the first planet carrier (1) of the first single planet row, the brake (B2) locks the first sun gear of the first single planet row, the first planet carrier (PC1) of the second single planet row is connected with a first ring gear, the first gear ring of the first single planet row is connected with the second planet carrier of the second single planet row and then is connected with a main speed reducer of the speed changing box, and the main speed reducer of the speed changing box is connected with a differential mechanism; when the vehicle is in a hybrid low-speed running state and the second clutch (C1) is in a locking state, whether a user needs to perform a rapid acceleration operation is judged, and if yes, the method comprises the following steps:
s1: the vehicle controller sends a preset oil pump motor rotating speed request threshold A to the oil pump motor controller through the CAN bus, the oil pump motor controller controls the oil pump motor to rapidly increase the rotating speed to the preset oil pump motor rotating speed request threshold A, and then step S2 is executed;
s2: the vehicle control unit cancels the current of the negative locking valve of the multi-mode brake (B1), controls the multi-mode brake (B1) to be in a bidirectional free state, and then executes the step S3;
s3: the vehicle control unit increases the torques of a large motor (E1) and a small motor (E2), rapidly increases the rotating speed of a first planet carrier (PC1), and executes the step S4 when the vehicle control unit detects that the rotating speed of the first planet carrier (PC1) is greater than a preset first planet carrier rotating speed threshold B;
s4: the vehicle control unit increases the current of a forward locking valve of a multi-mode brake (B1), controls the multi-mode brake (B1) to be in a reverse locking state, simultaneously reduces the rotating speed of a first planet carrier (PC1) according to a preset speed rate C by controlling the torques of a small motor (E1) and a large motor (E2), and executes a step S5 when the vehicle control unit detects that the rotating speed of the first planet carrier (PC1) is lower than a preset first planet carrier rotating speed threshold value D;
s5: the finished vehicle controller reduces the rotating speed of the first planet carrier (PC1) according to a preset speed E, wherein the preset speed E is smaller than a preset speed C, and when the finished vehicle controller detects that the rotating speed of the first planet carrier (PC1) is lower than a preset first planet carrier rotating speed threshold value F, the step S6 is executed;
s6: the vehicle controller increases the torque of an engine and a large motor (E2) until a multi-mode brake (B1) locked in the reverse direction locks a first planet carrier (PC1), gear shifting is achieved, and then the vehicle is in a hybrid large-torque driving running state.
2. The shift control method of a multi-mode brake-based hybrid vehicle according to claim 1, characterized in that: in the step S1, the preset oil pump motor rotation speed request threshold a is 1200 to 1500 rpm.
3. The shift control method of a multi-mode brake-based hybrid vehicle according to claim 1, characterized in that: in the step S3, the preset first planet carrier rotating speed threshold B is 150-200 rpm.
4. The shift control method of a multi-mode brake-based hybrid vehicle according to claim 1, characterized in that: in the step S4, the preset speed C is 350 to 400rad/S2The preset first planet carrier rotating speed threshold value D is 40-50 rpm; in the step S5, the preset speed E is 150 to 200rad/S2And the preset first planet carrier rotating speed threshold value F is 10-20 rpm.
5. The multi-mode brake-based shift control method for a hybrid vehicle according to any one of claims 1 to 4, characterized in that: and the basis for judging whether the user needs to perform the emergency acceleration operation is the current accelerator pedal and speed signal of the vehicle received by the vehicle control unit.
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| CN201811431711.9A CN109552311B (en) | 2018-11-28 | 2018-11-28 | Gear shifting control method of hybrid electric vehicle based on multi-mode brake |
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| CN201811431711.9A CN109552311B (en) | 2018-11-28 | 2018-11-28 | Gear shifting control method of hybrid electric vehicle based on multi-mode brake |
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| CN110091857B (en) * | 2019-04-25 | 2020-08-04 | 科力远混合动力技术有限公司 | Auxiliary gear shifting control method for double-planet-row deep hybrid power automobile brake |
| CN110091856B (en) * | 2019-04-26 | 2020-11-27 | 科力远混合动力技术有限公司 | Method for coordinately controlling sliding friction starting engine and accelerating gear-up of hybrid electric vehicle |
| CN113085528A (en) * | 2021-04-27 | 2021-07-09 | 浙江吉利控股集团有限公司 | Hybrid power system, hybrid transmission and automobile |
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| JP3641243B2 (en) * | 2002-02-26 | 2005-04-20 | 日産自動車株式会社 | Hybrid transmission |
| JP6627788B2 (en) * | 2017-01-23 | 2020-01-08 | トヨタ自動車株式会社 | Hybrid vehicle |
| CN107878447B (en) * | 2017-11-06 | 2019-07-19 | 科力远混合动力技术有限公司 | Sliding rub of hybrid vehicle starts the control method of engine and shift coordination |
| CN108105358B (en) * | 2018-01-19 | 2021-05-25 | 科力远混合动力技术有限公司 | Transmission for front-drive hybrid vehicle |
| CN108454613B (en) * | 2018-03-28 | 2020-12-04 | 重庆长安汽车股份有限公司 | Hybrid electric vehicle and gear shifting control method for hybrid electric vehicle |
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Effective date of registration: 20220829 Address after: No.16 Gongxin Avenue, industrial park, Yifeng County, Yichun City, Jiangxi Province Patentee after: Jiangxi Dingsheng New Material Technology Co.,Ltd. Address before: 528000 601-604 room, block A, 1 floor, 131 Ji Hua Xi Road, Chancheng District, Foshan, Guangdong. Patentee before: CORUN HYBRID POWER TECHNOLOGY Co.,Ltd. |