CN112344012B - 48V system dual-clutch automatic transmission sliding start-stop gear selection and shift control method - Google Patents

48V system dual-clutch automatic transmission sliding start-stop gear selection and shift control method Download PDF

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CN112344012B
CN112344012B CN201910720505.8A CN201910720505A CN112344012B CN 112344012 B CN112344012 B CN 112344012B CN 201910720505 A CN201910720505 A CN 201910720505A CN 112344012 B CN112344012 B CN 112344012B
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engine
gear
condition
stop
vehicle
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CN112344012A (en
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李长洲
张荣辉
宁甲奎
朱桂庆
王明玉
马岩
王歆誉
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FAW Group Corp
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FAW Group Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/02—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used
    • F16H61/0202—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric
    • F16H61/0204—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
    • F16H59/02—Selector apparatus
    • F16H59/04—Ratio selector apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
    • F16H59/74—Inputs being a function of engine parameters
    • F16H2059/746—Engine running state, e.g. on-off of ignition switch

Abstract

The invention belongs to the technical field of automobile electronic control, and particularly relates to a sliding start-stop gear selecting and shifting control method for a 48V system double-clutch automatic transmission. According to the invention, by setting the speed of the transmission at the specific downshift point under the engine stop working condition and the gear selecting and shifting method under the engine start transition working condition, the reasonable engine driving running rotating speed is obtained when the engine is started again, so that the excellent driving property and acceleration property of the whole vehicle are ensured. Meanwhile, the energy recovery efficiency of the braking energy recovery working condition can be improved.

Description

48V system dual-clutch automatic transmission sliding start-stop gear selection and shift control method
Technical Field
The invention belongs to the technical field of automobile electronic control, and particularly relates to a sliding start-stop gear selecting and shifting control method for a 48V system double-clutch automatic transmission.
Background
With the development of automobile technology and the stricter emission regulations, a 48V mild hybrid system which is a high-cost-performance hybrid scheme becomes a hot technology for controversial research of various automobile manufacturers at present. The hybrid system utilizes a BSG (Belt-drive Starter Generator) motor to realize smooth starting and stopping of the engine, is matched with a double-clutch automatic transmission, can realize multiple working conditions such as high-grade automatic starting and stopping, sliding starting and stopping, braking energy recovery and the like which cannot be realized by a traditional power assembly, effectively improves the smoothness of starting and stopping the engine on the premise of improving the dynamic property and the economical property of the whole vehicle, and can effectively improve the noise level of the whole vehicle.
The method adopts a reasonable control method under the sliding working condition that the engine of the hybrid power system is stopped and the short-time transition working condition that the engine is started, so as to ensure the excellent driving performance of the whole vehicle after the engine is started and improve the conversion efficiency of the braking energy recovery working condition.
Disclosure of Invention
The invention provides a 48V system double-clutch automatic transmission sliding start-stop gear selection and shift control method which can ensure high-level drivability and acceleration of a whole vehicle after an engine is started by selecting a reasonable current operating gear and an expected operating gear, and fills the blank in the field of control of automatic transmissions of hybrid power systems.
The technical scheme of the invention is explained by combining the drawings as follows:
A48V system dual-clutch automatic transmission sliding start-stop working condition gear selecting and shifting control method comprises the following steps:
step S100, starting the dual-clutch automatic transmission to work;
step S110, monitoring the whole vehicle power related signal group 1 in real time, checking the engine sliding stop condition in real time, and judging whether the engine sliding stop condition 1 is met; executing step two when the condition 1 of engine stop is met, and executing step 240 when the condition 1 of engine stop is not met;
step S120, after the engine is stopped, the vehicle runs under the condition that the engine is stopped, and the double-clutch transmission performs transmission gear disengaging control under the condition that the engine is stopped through pressure provided by the electric oil pump;
step S130, when the system judges that the specific transmission condition 2 is met, a speed compensation gear shifting mode is triggered; when the system determines that the specific transmission condition 2 is not satisfied, step S240 is executed;
step S140, calculating a gear shifting point of a speed compensation gear shifting mode, and adding speed compensation 1 when calculating an expected gear based on the current vehicle speed to realize early downshift in a sliding state, so that the dynamic property of the vehicle when starting the engine and driving again is ensured;
s150, a gear disengagement executing module executes gear disengagement control to realize early downshift in a sliding state, so that the dynamic property of the vehicle when the engine is started and driven again is ensured; meanwhile, the conversion efficiency of the braking energy recovery working condition can be effectively improved due to the high rotating speed of the clutch;
step S200, when the system meets the vehicle start-up condition, the vehicle enters start-up control; the vehicle start condition is that a driver accelerator pedal acceleration request, a driver braking request or the current vehicle speed is less than a minimum limited vehicle speed Vmin of sliding start-stop;
step S210: for a short-time transition working condition that the vehicle is driven from a stop sliding working condition to an engine start, if an expected operation gear fault occurs or an expected operation gear is not engaged under the starting working condition, taking the current on-shaft operation gear as the expected operation gear, and then performing subsequent control of the engine start;
step S220: after the engine is started, the engine speed and the clutch speed are synchronously finished, and a desired operation gear signal is locked within a short time t of clutch combination, namely a clutch torque exchange stage, so as to prevent the change of a current control gear in the time window;
step S2300: starting the engine, sending a rotating speed synchronization request to the engine by the transmission, and realizing the combination of the clutch after the synchronization is finished;
step S240: and in the current start-stop period, the double-clutch automatic transmission is subjected to sliding start-stop working condition gear selection and shift control.
Step S110, the power related signal group 1 of the whole vehicle specifically refers to an engine running state, a micro-hybrid system power assembly mode state, an accelerator pedal, a vehicle speed, a current running gear, an expected running gear, an on-shaft gear fault state and a transmission gear selection and shift control mode.
Step S110, the condition 1 of stopping the engine specifically means whether the states of the engine and a BSG motor of a 48V system meet start-stop conditions or not; whether the states of the double-clutch automatic transmission and the electric oil pump support starting and stopping of the engine or not; under the condition that the conditions are met, the system detects whether the current vehicle state meets the triggering condition of the coast stop or not and determines whether the engine stop is executed or not.
Step S130, the specific transmission condition 2 specifically means that the current engine operating state signal is in a stop state; the current micro-hybrid system power assembly mode state signal is in a shutdown sliding state; the current accelerator pedal signal is less than 2%; the on-shaft gear fault state signal is fault-free; the current transmission gear selection control mode is a normal mode.
In step S140, the speed compensation 1 specifically includes: and the speed compensation V is a x T, wherein a is obtained by differentiating the rotating speed of the output shaft, T is the starting time of the engine under the working condition, and the time is obtained by looking up a table through a calibration table.
The invention has the beneficial effects that:
according to the invention, by setting the speed of the transmission at the specific downshift point under the engine stop working condition and the gear selecting and shifting method under the engine start transition working condition, the reasonable engine driving running rotating speed is obtained when the engine is started again, so that the excellent driving property and acceleration property of the whole vehicle are ensured. Meanwhile, the energy recovery efficiency of the braking energy recovery working condition can be improved.
Drawings
FIG. 1 is a schematic diagram of a 48V micro-mixing system according to an embodiment of the present invention;
FIG. 2 is a shift point speed compensation schematic of the present invention.
FIG. 3 is a flow chart of a control strategy of the present invention;
in the figure: 1. an engine; 2. a transmission; 3. a BSG motor; 4. an electric oil pump; 5. a 48V battery; 6. DC/DC7, 12V battery.
Detailed Description
Referring to fig. 1, a 48V micro-hybrid system includes an engine 1, a transmission 2, a BSG motor 3, an electric oil pump 4, a 48V battery 5, a DC/DC6, and a 12V battery 7;
the BSG motor 3 is installed at the front end of the engine 1 and is connected with the engine 1 through a belt, wherein the BSG motor 3 is powered by a 48V battery 5, and the engine 1 can be directly started through the BSG motor 3. The engine 1 and the transmission 2 are connected, and after two clutches of the transmission are completely separated, power transmission between the engine 1 and the transmission 2 can be cut off. The electric oil pump 4 is powered by a 12V battery 7, and the DC/DC6 is connected with a 48V battery 5 and the 12V battery 7; the pressure required for gear shifting of the transmission can be provided by rotating the electric pump 4 under the stop working condition of the engine 1 by the transmission 2.
Referring to fig. 3, a sliding start-stop gear selection and shift control method of a 48V system dual-clutch automatic transmission comprises the following steps:
step S100, starting the dual-clutch automatic transmission to work;
step S110, monitoring the whole vehicle power related signal group 1 in real time, checking the engine sliding stop condition in real time, and judging whether the engine sliding stop condition 1 is met; executing step two when the condition 1 of engine stop is met, and executing step 240 when the condition 1 of engine stop is not met;
step S110, the power related signal group 1 of the whole vehicle specifically refers to an engine running state, a micro-hybrid system power assembly mode state, an accelerator pedal, a vehicle speed, a current running gear, an expected running gear, an on-shaft gear fault state and a transmission gear selection and shift control mode.
The condition 1 for stopping the engine specifically refers to whether the states of the engine and a BSG motor of a 48V system meet start-stop conditions or not; whether the states of the double-clutch automatic transmission and the electric oil pump support starting and stopping of the engine or not; under the condition that the conditions are met, the system detects whether the current vehicle state meets the triggering condition of the coast stop or not and determines whether the engine stop is executed or not.
Step S120, after the engine is stopped, the vehicle runs under the condition that the engine is stopped, and the double-clutch transmission performs transmission gear disengaging control under the condition that the engine is stopped through pressure provided by the electric oil pump;
step S130, when the system judges that the specific transmission condition 2 is met, a speed compensation gear shifting mode is triggered; when the system determines that the specific transmission condition 2 is not satisfied, step S240 is executed;
the specific transmission condition 2 specifically means that the current engine operating state signal is in a stop state; the current micro-hybrid system power assembly mode state signal is in a shutdown sliding state; the current accelerator pedal signal is less than 2%; the on-shaft gear fault state signal is fault-free; the current transmission gear selection control mode is a normal mode.
Step S140, calculating a gear shifting point of a speed compensation gear shifting mode, and adding speed compensation 1 when calculating an expected gear based on the current vehicle speed to realize early downshift in a sliding state, so that the dynamic property of the vehicle when starting the engine and driving again is ensured;
in step S140, the speed compensation 1 specifically includes: and the speed compensation V is a x T, wherein a is obtained by differentiating the rotating speed of the output shaft, T is the starting time of the engine under the working condition, and the time is obtained by looking up a table through a calibration table. For the example of 5-gear down 4-gear, the schematic before and after introducing speed compensation is shown in fig. 2.
S150, a gear disengaging and engaging execution module executes gear disengaging and engaging control to realize early downshift in a sliding state, so that the dynamic property of a vehicle engine when the engine is started and is driven again is ensured; meanwhile, the conversion efficiency of the braking energy recovery working condition can be effectively improved due to the high rotating speed of the clutch;
step S200, when the system meets the vehicle start-up condition, the vehicle enters start-up control; the vehicle start condition is that a driver accelerator pedal acceleration request, a driver braking request or the current vehicle speed is less than a minimum limited vehicle speed Vmin of sliding start-stop;
step S210: for a short-time transition working condition that the vehicle is driven from a stop sliding working condition to an engine start, if an expected operation gear fault occurs or an expected operation gear is not engaged under the starting working condition, taking the current on-shaft operation gear as the expected operation gear, and then performing subsequent control of the engine start;
step S220: after the engine is started, the engine speed and the clutch speed are synchronously finished, and a desired operation gear signal is locked within a short time t of clutch combination, namely a clutch torque exchange stage, so as to prevent the change of a current control gear in the time window;
step S2300: starting the engine, sending a rotating speed synchronization request to the engine by the transmission, and realizing the combination of the clutch after the synchronization is finished;
step S240: and in the current start-stop period, the double-clutch automatic transmission is subjected to sliding start-stop working condition gear selection and shift control.
There is a difference between the downshift point in the stop coasting state and the downshift point in the normal coasting state in each gear. The corresponding clutch rotating speed is required to be greater than or equal to 1300 rpm before the shutdown, the sliding and the downshift.

Claims (1)

1. A sliding start-stop gear selection and shift control method of a 48V system dual-clutch automatic transmission is characterized by comprising the following steps of:
step S100, starting the dual-clutch automatic transmission to work;
step S110, monitoring the power related signal set 1 of the whole vehicle in real time, checking the sliding stop condition of the engine in real time, and judging whether the condition 1 of the engine stop is met; step S120 is executed when condition 1 for engine stop is met, and step S240 is executed when condition 1 for engine stop is not met;
step S120, after the engine is stopped, the vehicle runs under the condition that the engine is stopped, and the double-clutch transmission performs transmission gear disengaging control under the condition that the engine is stopped through pressure provided by the electric oil pump;
step S130, when the system judges that the specific transmission condition 2 is met, a speed compensation gear shifting mode is triggered; when the system determines that the specific transmission condition 2 is not satisfied, step S240 is executed;
step S140, calculating a gear shifting point of a speed compensation gear shifting mode, and adding speed compensation 1 when calculating an expected gear based on the current vehicle speed to realize early downshift in a sliding state, so that the dynamic property of the vehicle when starting the engine and driving again is ensured;
s150, a gear disengagement executing module executes gear disengagement control to realize early downshift in a sliding state, so that the dynamic property of the vehicle when the engine is started and driven again is ensured; meanwhile, the conversion efficiency of the braking energy recovery working condition can be effectively improved due to the high rotating speed of the clutch;
step S200, when the system meets the vehicle start-up condition, the vehicle enters start-up control; the starting condition of the vehicle is that the accelerator pedal of a driver accelerates, the brake of the driver requests or the current vehicle speed is less than the minimum limited vehicle speed V of the sliding start-stopmin；
Step S210: for a short-time transition working condition that the vehicle is driven from a stop sliding working condition to an engine start, if an expected operation gear fault occurs or an expected operation gear is not engaged under the starting working condition, taking the current on-shaft operation gear as the expected operation gear, and then performing subsequent control of the engine start;
step S220: after the engine is started, the engine speed and the clutch speed are synchronously finished, and a desired operation gear signal is locked within a short time t of clutch combination, namely a clutch torque exchange stage, so as to prevent the change of a current control gear in the time window;
step S2300: starting the engine, sending a rotating speed synchronization request to the engine by the transmission, and realizing the combination of the clutch after the synchronization is finished;
step S240: in the current start-stop period, the dual-clutch automatic transmission finishes the control of gear selection and shifting under the sliding start-stop working condition;
step S110, the complete vehicle power related signal group 1 specifically refers to an engine running state, a micro-hybrid system power assembly mode state, an accelerator pedal, a vehicle speed, a current running gear, an expected running gear, an on-shaft gear fault state and a transmission gear selecting and shifting control mode;
step S110, the condition 1 of stopping the engine specifically means whether the states of the engine and a BSG motor of a 48V system meet start-stop conditions or not; whether the states of the double-clutch automatic transmission and the electric oil pump support starting and stopping of the engine or not; under the condition that the conditions are met, the system detects whether the current vehicle state meets the triggering condition of the sliding stop or not and determines whether the engine stop is executed or not;
step S130, the specific transmission condition 2 specifically means that the current engine operating state signal is in a stop state; the current micro-hybrid system power assembly mode state signal is in a shutdown sliding state; the current accelerator pedal signal is less than 2%; the on-shaft gear fault state signal is fault-free; the current gear selecting and shifting control mode of the transmission is a normal mode;
in step S140, the speed compensation 1 specifically includes: and the speed compensation V is a x T, wherein a is obtained by differentiating the rotating speed of the output shaft, T is the starting time of the engine under the working condition, and the time is obtained by looking up a calibration table.
CN201910720505.8A 2019-08-06 2019-08-06 48V system dual-clutch automatic transmission sliding start-stop gear selection and shift control method Active CN112344012B (en)

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CN113446390B (en) * 2021-07-22 2023-02-21 中国第一汽车股份有限公司 Transmission oil coolant circulation system, control method, vehicle, and storage medium

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US9182036B2 (en) * 2013-12-24 2015-11-10 GM Global Technology Operations LLC Binary clutch disengagement control in a neutral shift
US10525970B2 (en) * 2017-02-24 2020-01-07 Ford Global Technologies, Llc Systems and methods for controlling an engine start in a hybrid vehicle
CN110077390A (en) * 2019-03-22 2019-08-02 中国第一汽车股份有限公司 A kind of DCT transmission control method and system for supporting 48V energy regenerating

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