CN112622871B - Gear shifting control method of hybrid power system - Google Patents
Gear shifting control method of hybrid power system Download PDFInfo
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- CN112622871B CN112622871B CN202011582212.7A CN202011582212A CN112622871B CN 112622871 B CN112622871 B CN 112622871B CN 202011582212 A CN202011582212 A CN 202011582212A CN 112622871 B CN112622871 B CN 112622871B
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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
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/10—Conjoint control of vehicle sub-units of different type or different function including control of change-speed gearings
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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
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/02—Conjoint control of vehicle sub-units of different type or different function including control of driveline clutches
-
- 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
-
- 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
- B60W20/40—Controlling the engagement or disengagement of prime movers, e.g. for transition between prime movers
-
- 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
- B60W2710/02—Clutches
- B60W2710/021—Clutch engagement state
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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
- B60W2710/1005—Transmission ratio engaged
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Automation & Control Theory (AREA)
- Hybrid Electric Vehicles (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention relates to a gear shifting control method of a hybrid power system, which is characterized in that according to a gear request and a vehicle running mode request sent by a hybrid power vehicle controller, a transmission controller firstly controls the torque of a crankshaft to be reduced and a clutch to be opened according to a request command sent by the transmission controller, and after the clutch is completely opened, a gear shifting execution mechanism is controlled to perform gear shifting and close the clutch according to the gear request so as to finish gear shifting. The gear shifting control method provided by the invention is suitable for a hybrid power system with multiple gears, and can ensure that the power output range of an engine is wide under the direct drive mode of the engine, the high-efficiency area is fully utilized, and the oil consumption of the whole vehicle is reduced.
Description
Technical Field
The invention relates to the field of hybrid electric vehicle control, in particular to a control method for gear shifting of a hybrid electric system.
Background
The new energy automobile is more and more emphasized by various automobile manufacturers, particularly, a current oil-electricity hybrid system with double motors and a transmission for carrying the whole automobile is more and more adopted by various automobile enterprises, wherein a traditional engine is adopted to drive a generator to generate electricity, the engine also provides power output to a wheel end, in order to enable the engine to work in a high-efficiency region as far as possible, the transmission is required to have a proper gear speed ratio, the currently adopted hybrid transmission with a fixed speed ratio is narrow in power output region range, and when the hybrid transmission is driven in parallel or directly driven by the engine, low speed and medium and high speed cannot be simultaneously considered, so that the reduction of the oil consumption of the whole automobile is not facilitated.
Therefore, how to implement a gear shift control method for a multi-gear hybrid power system is an urgent problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention is directed to a shift control method for a hybrid power system, so as to solve the problem that the conventional hybrid system is not favorable for considering both low speed and medium and high speed and reducing the fuel consumption of the entire vehicle due to a narrow power output range of an engine in an engine direct drive mode.
In order to achieve the purpose, the invention adopts the following technical scheme:
a hybrid powertrain shift control method comprising:
the hybrid vehicle controller sends a gear request and a vehicle running mode request command, the transmission controller receives the gear request and the vehicle running mode request command, controls the current crankshaft torque to decrease, and controls the clutch to open according to the decreased crankshaft torque value;
the gear shifting executing mechanism is switched to a target gear according to a gear request sent by the hybrid vehicle controller under the control of the transmission controller, meanwhile, the transmission controller controls the clutch to perform pre-charging operation, and the speed difference between the input end and the output end of the clutch is adjusted by adjusting the rotating speed of the crankshaft to meet the clutch closing condition;
the transmission controller controls the clutch torque to rise to the sum of the crankshaft target torque and the clutch target torque compensation value according to the crankshaft target torque requested by the hybrid vehicle controller, and controls the current crankshaft torque to rise to the crankshaft target torque;
the clutch torque dynamically follows the current crankshaft torque in real time, and the clutch following torque is the sum of the current crankshaft torque and the clutch target torque compensation value.
Preferably, the gear request and the vehicle running mode request command an operation of performing a gear shift in an engine direct drive mode of the hybrid system.
Preferably, the controlling of the clutch to open according to the magnitude of the current crankshaft torque drop comprises:
the hybrid vehicle controller acquires the current crankshaft torque and sends the current crankshaft torque to the transmission controller, the crankshaft torque falling slope is calculated according to the ratio of the current crankshaft torque to the falling time parameter set according to the crankshaft target torque, and meanwhile the clutch torque is controlled to fall along with the current crankshaft torque in real time according to the crankshaft torque falling slope;
and when the crankshaft torque value is lower than 5Nm after the reduction, the transmission controller controls oil drainage of the oil pump to quickly reduce the pressure of the clutch until the clutch is in an open state.
Preferably, the clutch close condition includes:
after the transmission controller activates the crankshaft speed mode request, the hybrid vehicle controller regulates the crankshaft based on a target rotational speed calculated from the vehicle speed such that the differential speed between the input and output of the clutch can be closed with one of the following conditions:
when the low gear is switched to the high gear, the speed difference between the input end and the output end of the clutch is less than or equal to 300 rpm;
when the high gear is switched to the low gear, the speed difference between the input end and the output end of the clutch is less than or equal to 50 rpm.
Preferably, the clutch torque rises gradually according to a clutch torque rising slope, and the clutch torque rising slope is a ratio of the current clutch torque to a set clutch target torque rising time parameter; the current clutch torque is the sum of the crankshaft target torque and the clutch target torque compensation value.
Preferably, the crankshaft torque is increased in a manner that the transmission controller transmits the current clutch torque to the hybrid vehicle control unit, and the hybrid vehicle control unit controls the current crankshaft torque to be increased to the crankshaft target torque.
Preferably, the crankshaft torque is the sum of the output torque of the engine and the output torque of the generator in the hybrid power system, and the crankshaft is an input shaft shared by the engine and the generator.
The invention provides a gear shifting control method of a hybrid power system, according to a gear request and a vehicle running mode request sent by a hybrid power vehicle controller, a transmission controller firstly controls crankshaft torque to drop and a clutch to open according to a request command sent by the transmission controller, and controls a gear shifting execution mechanism to switch gears and close the clutch according to the gear request after the clutch is completely opened, so as to finish gear shifting. The gear shifting control method provided by the invention is suitable for a hybrid power system with multiple gears, and can ensure that the power output range of an engine is wide under the direct drive mode of the engine, the high-efficiency area is fully utilized, and the oil consumption of the whole vehicle is reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural diagram of a hybrid powertrain system provided by the present invention;
FIG. 2 is a flowchart of a method for controlling a shift of a hybrid powertrain according to the present invention.
Description of reference numerals:
1 engine 2 generator 3 clutch
4 input shaft 5 drive motor 6 first speed change mechanism
7 output end of second speed changing mechanism 8
Detailed Description
In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The embodiment of the invention provides a gear shifting control method of a hybrid power system, wherein in the gear shifting control method of the hybrid power system, a hybrid vehicle controller sends an instruction, a transmission controller receives the instruction to execute corresponding operation, or a signal acquired by the transmission controller is sent to the hybrid vehicle controller, and the hybrid vehicle controller controls the corresponding operation.
According to the structure of the hybrid power system applicable to the invention, as shown in fig. 1, the power output torque of an engine (1) and the power output torque of a generator (2) are coupled on the same input shaft (4), the engine (1) and the generator (2) are in transmission connection with a first speed change mechanism (6) through a clutch (3), a driving motor (5) is in transmission connection with a second speed change mechanism (7), and the first speed change mechanism (6) and the second speed change mechanism (7) are both connected with an output end (8).
According to the gear shifting control method of the hybrid power system, the gear shifting execution mechanism is controlled to switch gears according to a gear request and a vehicle running mode request sent by the hybrid vehicle controller, wherein the vehicle running mode is an engine direct-drive mode, and the gear request is gear switching between a low gear and a high gear.
Referring to fig. 2, a hybrid powertrain shift control method includes:
the hybrid vehicle control unit (HCU) sends a gear request and a vehicle running mode request command, a Transmission Controller (TCU) receives the gear request and the vehicle running mode request command, the Transmission Controller (TCU) controls the current crankshaft torque to gradually decline according to the crankshaft torque decline slope, meanwhile, the clutch torque declines according to the crankshaft torque decline slope in real time along with the current crankshaft torque, and in the process, the crankshaft torque decline slope (Gradient1) is calculated according to the following formula:
Gradient1＝T1/Time1
wherein, T1: a current crankshaft torque value;
time 1: the set crankshaft target torque fall time.
And obtaining a reduced crankshaft torque value through calibration, and when the reduced crankshaft torque value is lower than 5Nm, controlling oil drainage of an oil pump by a Transmission Controller (TCU) to quickly reduce the pressure of the clutch until the clutch is in an open state.
In order to guarantee the power requirement of driving during the process of crankshaft torque reduction, a hybrid vehicle control unit (HCU) controls a driving motor (TM) to drive a second speed change mechanism to enable the vehicle to move forwards.
When the clutch to be switched is in a fully opened state, the gear shifting actuating mechanism is switched to a target gear according to a gear request sent by a hybrid vehicle control unit (HCU) under the control of a Transmission Controller (TCU), and meanwhile, the Transmission Controller (TCU) controls the clutch to perform pre-charging operation and adjusts the speed difference between the input end and the output end of the clutch to meet the clutch closing condition by adjusting the rotating speed of a crankshaft.
Optionally, the clutch close condition comprises:
after the transmission controller activates the crankshaft speed mode request, the hybrid vehicle controller regulates the crankshaft based on a target rotational speed calculated from the vehicle speed such that the differential speed between the input and output of the clutch can be closed with one of the following conditions:
when the low gear is switched to the high gear, the speed difference between the input end and the output end of the clutch is less than or equal to 300 rpm;
when the high gear is switched to the low gear, the speed difference between the input end and the output end of the clutch is less than or equal to 50 rpm.
When the speed difference between the input end and the output end of the clutch meets one of the conditions obtained by monitoring, a Transmission Controller (TCU) controls the clutch to start slipping and increasing the torque of the clutch to 20Nm, the clutch is judged to be closed, the Transmission Controller (TCU) closes the crankshaft speed mode request, and the crankshaft is not regulated any more.
After the clutch is completely closed, in order to guarantee the requirements of the current gear on the clutch torque and the crankshaft torque, a Transmission Controller (TCU) controls the clutch torque to rise to the sum of the crankshaft target torque and the clutch target torque compensation value according to the crankshaft target torque requested by a hybrid vehicle control unit (HCU), and controls the current crankshaft torque to rise to the crankshaft target torque.
Optionally, the clutch torque rise is gradually increased according to a clutch torque rise slope (Gradient2), wherein the clutch torque rise slope is the ratio of the current clutch torque to the set clutch target torque rise time parameter; the current clutch torque is the sum of the crankshaft target torque and the clutch target torque compensation value, and the specific calculation formula is as follows:
Gradient2＝(T2+offset1)/Time2
wherein, T2: a crankshaft target torque;
offset 1: the clutch target torque compensation value set at the stage;
time 2: the set clutch target torque rise time.
Optionally, the crankshaft torque is increased, the transmission controller sends the current clutch torque to the hybrid vehicle controller, and the hybrid vehicle controller controls the current crankshaft torque to be increased to the crankshaft target torque.
Meanwhile, in the process of crankshaft torque rise, in order to guarantee the power requirement of driving, a hybrid vehicle control unit (HCU) controls a driving motor (TM) to drive a second speed change mechanism to enable the vehicle to move forwards.
After the gear shifting execution mechanism finishes switching a target gear, in order to ensure that a clutch is always in a closed state in the process of driving the vehicle at the gear to be switched and ensure that the torque of a crankshaft is output to a wheel end, a Transmission Controller (TCU) controls the torque of the clutch to dynamically follow the current torque of the crankshaft, and the sum of the current torque of the crankshaft of the clutch and the compensation value of the target torque of the clutch follows the torque, the specific calculation formula is as follows:
clutch following torque T3+ offset 2;
wherein, T3: the current crankshaft torque at this stage;
offset 2: and the clutch target torque compensation value is set at the stage.
In the embodiment of the invention, the crankshaft torque is the sum of the output torque of the engine and the output torque of the generator in the hybrid power system, and the crankshaft is an input shaft shared by the engine and the generator.
The invention provides a gear shifting control method of a hybrid power system, according to a gear request and a vehicle running mode request sent by a hybrid power vehicle controller, a transmission controller firstly controls crankshaft torque to drop and a clutch to open according to a request command sent by the transmission controller, and controls a gear shifting execution mechanism to switch gears and close the clutch according to the gear request after the clutch is completely opened, so as to finish gear shifting. The gear shifting control method provided by the invention is suitable for a hybrid power system with multiple gears, and can ensure that the power output range of an engine is wide under the direct drive mode of the engine, the high-efficiency area is fully utilized, and the oil consumption of the whole vehicle is reduced.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A hybrid system gear-shifting control method is applied to a hybrid vehicle, and is characterized by comprising the following steps:
the hybrid vehicle controller sends a gear request and a vehicle running mode request command, the transmission controller receives the gear request and the vehicle running mode request command, controls the current crankshaft torque to decrease, and controls the clutch to open according to the decreased crankshaft torque value;
the gear shifting executing mechanism is switched to a target gear according to a gear request sent by the hybrid vehicle controller under the control of the transmission controller, meanwhile, the transmission controller controls the clutch to perform pre-charging operation, and the speed difference between the input end and the output end of the clutch is adjusted to meet the clutch closing condition by adjusting the rotating speed of a crankshaft;
the transmission controller controls the clutch torque to rise to the sum of the crankshaft target torque and a clutch target torque compensation value according to the crankshaft target torque requested by the hybrid vehicle controller, and controls the current crankshaft torque to rise to the crankshaft target torque;
the clutch torque rises gradually according to a clutch torque rising slope, the clutch torque rising slope is a ratio of the current clutch torque to a set clutch target torque rising time parameter, and the current clutch torque is the sum of the crankshaft target torque and a clutch target torque compensation value;
the clutch torque dynamically follows the current crankshaft torque in real time, and the clutch following torque is the sum of the current crankshaft torque and the clutch target torque compensation value.
2. The hybrid system shift control method according to claim 1, wherein the gear request and vehicle operating mode request commands an operation to perform a gear shift in an engine direct drive mode of the hybrid system.
3. The hybrid powertrain shift control method of claim 2, wherein the derated crankshaft torque value controls clutch opening, comprising:
the hybrid vehicle controller acquires the current crankshaft torque and sends the current crankshaft torque to the transmission controller, the crankshaft torque descending slope is calculated according to the ratio of the current crankshaft torque to a descending time parameter set according to the crankshaft target torque, and meanwhile, the clutch torque is controlled to descend along with the current crankshaft torque in real time according to the crankshaft torque descending slope;
and when the crankshaft torque value is lower than 5Nm after the reduction, the transmission controller controls oil drainage of the oil pump to quickly reduce the pressure of the clutch until the clutch is in an open state.
4. The hybrid powertrain shift control method of claim 1, wherein the clutch close condition includes:
after the transmission controller activates the crankshaft speed mode request, the hybrid vehicle controller regulates the speed of the crankshaft based on a target rotating speed calculated by the vehicle speed, so that the speed difference between the input end and the output end of the clutch can be closed under one of the following conditions:
when the low gear is switched to the high gear, the speed difference between the input end and the output end of the clutch is less than or equal to 300 rpm;
and when the high gear is switched to the low gear, the speed difference between the input end and the output end of the clutch is less than or equal to 50 rpm.
5. The hybrid powertrain system shift control method of claim 1, wherein the crankshaft torque ramp-up is a transmission controller sending the current clutch torque to the hybrid vehicle control unit, the hybrid vehicle control unit controlling the current crankshaft torque ramp-up to the crankshaft target torque.
6. The hybrid system shift control method according to any one of claims 1 to 5, wherein the crankshaft torque is a sum of an engine output torque and a generator output torque in the hybrid system, and the crankshaft is an input shaft common to the engine and the generator.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011582212.7A CN112622871B (en) | 2020-12-28 | 2020-12-28 | Gear shifting control method of hybrid power system |
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| CN202011582212.7A CN112622871B (en) | 2020-12-28 | 2020-12-28 | Gear shifting control method of hybrid power system |
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| CN112622871B true CN112622871B (en) | 2022-03-08 |
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| CN113954817B (en) * | 2021-03-02 | 2023-12-01 | 长城汽车股份有限公司 | Gear shifting method of hybrid electric vehicle, controller and vehicle |
| CN116238474A (en) * | 2023-03-28 | 2023-06-09 | 蜂巢传动系统(江苏)有限公司 | Start control method, device and system for hybrid vehicle, vehicle and storage medium |
| CN116620258B (en) * | 2023-07-24 | 2023-09-22 | 成都赛力斯科技有限公司 | Torque switching control method and device applied to emergency braking |
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| US7577507B2 (en) * | 2006-03-22 | 2009-08-18 | Gm Global Technology Operations, Inc. | Driveline lash estimation and clunk management using multivariable active driveline damping |
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| CN104608760A (en) * | 2014-10-20 | 2015-05-13 | 比亚迪股份有限公司 | Hybrid electric vehicle, gear-shifting control method thereof and power transmission system thereof |
| CN104590244A (en) * | 2014-12-22 | 2015-05-06 | 天津市松正电动汽车技术股份有限公司 | Gear shifting control method for hybrid power vehicle |
| CN105438170A (en) * | 2015-12-25 | 2016-03-30 | 北京新能源汽车股份有限公司 | Coordinated control method and system for gear switching and working mode switching and vehicle |
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