CN111762159B - Start-stop coordination control method for 48V micro-mixing system double-clutch transmission - Google Patents
Start-stop coordination control method for 48V micro-mixing system double-clutch transmission Download PDFInfo
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- CN111762159B CN111762159B CN201910193624.2A CN201910193624A CN111762159B CN 111762159 B CN111762159 B CN 111762159B CN 201910193624 A CN201910193624 A CN 201910193624A CN 111762159 B CN111762159 B CN 111762159B
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- 102220014598 rs397517195 Human genes 0.000 claims description 2
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- 238000002360 preparation method Methods 0.000 abstract description 5
- 239000000446 fuel Substances 0.000 description 5
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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
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
- B60W30/18—Propelling the vehicle
- B60W30/18009—Propelling the vehicle related to particular drive situations
- B60W30/18018—Start-stop drive, e.g. in a traffic jam
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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
- B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
- B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
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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
- B60W20/00—Control systems specially adapted for hybrid vehicles
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- Chemical & Material Sciences (AREA)
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- Automation & Control Theory (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
- Hybrid Electric Vehicles (AREA)
Abstract
The invention belongs to the technical field of automobile electronic control, and particularly relates to a method for coordinately controlling starting and stopping of a 48V micro-hybrid system double-clutch transmission. The engine of the control method can receive the stop state instruction from the transmission in real time and monitor whether the transmission supports the stop function; after the vehicle triggers the engine stop function, the engine requests the transmission to execute stop preparation, so that the coordinated control consistency of the engine and the transmission in the whole stop process is realized, and the influence of sudden stop of the engine on the control process of the double-clutch transmission is avoided, and the whole vehicle is towered; the engine and the transmission are stopped and coordinated under the working condition that the vehicle has a certain vehicle speed, the pressure required by the gear picking and engaging of the wet double clutch is provided by the electric oil pump, the gear picking and engaging control process of the transmission under the working condition that the engine is stopped can be realized, the oil saving potential of a 48V micro-mixing system is further fully exerted, and the oil consumption and the emission of the whole vehicle are reduced.
Description
Technical Field
The invention belongs to the technical field of automobile electronic control, and particularly relates to a method for coordinately controlling starting and stopping of a 48V micro-hybrid system double-clutch transmission.
Background
In order to further reduce the fuel consumption of automobiles and meet the requirements of fuel consumption regulations, a low-cost fuel-saving technical scheme is provided at present, and a 48V micro-mixing system becomes a technical hotspot researched by various automobile manufacturers. A BSG (Belt-drive Starter Generator) motor is used for replacing a traditional starting motor and a traditional Generator, the DC/DC converter is matched with a 12V electrical system of a traditional vehicle, and a DCT wet type double-clutch transmission is matched on the basis of further using the existing 12V electrical system, so that the multi-working-condition coordination control of a 48V system of the vehicle is realized. The 48V micro-mixing system matched with the DCT double-clutch transmission can realize the functions of idling start-stop, expansion start-stop, sliding start-stop, acceleration assistance, energy recovery and the like of the vehicle, reduces the fuel consumption of the whole vehicle by 10-15%, further optimizes the engine start smoothness and improves the NVH of the whole vehicle.
The starting and stopping coordination of the engine and the transmission under the 48V system is the key of the 48V micro-mixing system in exerting the potential of the whole vehicle, reducing the fuel consumption of the whole vehicle and improving the smoothness and reliability of the whole vehicle, so that a high-reliability 48V system engine and double-clutch transmission starting and stopping coordination control method is needed to be developed, the reliability of the coordination control of the engine and the transmission is guaranteed, the oil saving contribution of the 48V micro-mixing system in the whole vehicle is exerted, and the fuel consumption of the whole vehicle is reduced.
Disclosure of Invention
The invention provides a simple method for controlling the coordination of starting and stopping of a 48V micro-mixing system engine and a double-clutch transmission, and solves the existing problems.
The technical scheme of the invention is described as follows by combining the attached drawings:
A48V micro-mixing system double-clutch transmission start-stop coordination control method comprises the following steps:
s100: the engine is subjected to shutdown state inspection, the state of a BSG motor of a 48V system is inspected, and whether the basic condition 1 of engine shutdown is met is judged;
s200: the double-clutch transmission is subjected to shutdown state detection, the states of a transmission sensor and the fault state of a hydraulic execution solenoid valve are detected, and whether the transmission supports the start-stop state of the engine is sent to the engine;
s300: the engine judges whether the engine meets the basic stop condition 2 or not according to the basic stop condition 1 and the starting and stopping state fed back by the transmission;
s400: when meeting the basic condition 2 of engine stop, the engine sends a stop request instruction to the transmission after detecting that the current working condition of the vehicle meets the stop trigger condition;
s500: after the transmission receives a stop request command of an engine, clutch separation control is executed, an electric oil pump is started, and pressure required by gear shifting of the dual-clutch transmission is kept;
s600: after the transmission detects that the rotating speed of the electric oil pump is normal, a state that the transmission is allowed to stop is fed back to the engine; after the engine receives the stop state fed back by the transmission, the engine is stopped;
s700: after the engine is stopped, the vehicle runs under the condition of stopping the engine, and the double-clutch transmission can perform transmission gear disengaging and engaging control under the condition of stopping the engine through the pressure provided by the electric oil pump;
s800: in the stopping process of the engine, the transmission checks the state of the electric oil pump in real time, when the electric oil pump is detected to have a fault, the transmission immediately requests the engine to start, the engine drives the mechanical oil pump to provide pressure required by control for the double-clutch transmission, and the normal operation of the whole 48V power system is guaranteed.
The engine stop basic condition 1 in the step S100 refers to checking the engine to check the current electrical system fault state, the engine water temperature, the 48V battery temperature, the battery electric quantity SOC, and the BSG motor state; if the electric system of the engine has no fault, the water temperature of the engine is in a set threshold interval, the battery temperature of 48V is greater than a set minimum temperature threshold, the battery electric quantity SCO is greater than a set minimum threshold, and the BSG motor has no fault, the engine judges that the engine meets the basic condition 1 of shutdown.
The step S200 of checking the shutdown state of the double-clutch transmission refers to checking that a sensor of the transmission is fault-free, a hydraulic execution solenoid valve of the transmission is normal, a gear engagement state of the transmission is normal, a clutch system is fault-free, an electric oil pump is normal, and the temperature of the transmission is within a set temperature threshold range; if the engine is not in the stop condition, the transmission judges that the engine is not in the stop condition, and feeds back the state to the engine through the CAN bus to inform the engine that the transmission does not have the stop condition.
The engine stop basic condition 2 in step S300 is a state in which the engine receives a feedback from the transmission to support the engine stop on the premise that the engine stop basic condition 1 is satisfied; in the condition that the engine base condition 2 is met, it indicates that both the engine system and the transmission system support the engine stop condition.
The condition that the current working condition of the vehicle meets the engine stop triggering condition in the step S400 means that a driver steps on a brake, the vehicle speed is lower than a set threshold value, the vehicle deceleration is within a set threshold value range, and the ESP function of the vehicle is not activated.
The electric oil pump in step S500 is an electric pump that continues to rotate through the 12V power supply system in the engine stop state, and provides the pressure required for the wet dual clutch transmission to engage or disengage the transmission gear in the stop condition.
The normal rotation speed of the electric oil pump in the step S600 refers to the preset rotation speed of the electric oil pump, and the transmission determines that the rotation speed of the electric oil pump is normal and can provide the required pressure for the transmission to shift gears by checking that the actual rotation speed of the electric oil pump reaches the set rotation speed threshold range.
The step S800 of checking the state of the electric oil pump in real time by the transmission means checking whether the electric oil pump has an overvoltage, an undervoltage, an overcurrent fault, or a fault state of a sensor.
The invention has the beneficial effects that:
1. according to the method for coordinately controlling the starting and the stopping of the 48V micro-hybrid system dual-clutch transmission, an engine can receive a stop state instruction from the transmission in real time and monitor whether the transmission supports a stop function or not; after the vehicle triggers the engine stop function, the engine requests the transmission to execute stop preparation, so that the coordinated control consistency of the engine and the transmission in the whole stop process is realized, and the influence of sudden stop of the engine on the control process of the double-clutch transmission is avoided, so that the whole vehicle is towered;
2. the invention realizes the stop coordination of the engine and the transmission under the working condition that the vehicle has a certain vehicle speed, fully utilizes the pressure provided by the electric oil pump for the gear shifting of the wet double clutch, can realize the gear shifting control process of the transmission under the working condition that the engine is stopped, further fully exerts the oil saving potential of a 48V micro-mixing system, and reduces the oil consumption and the emission of the whole vehicle;
3. the invention realizes the stop coordination of the engine and the transmission under the working condition that the vehicle has a certain vehicle speed, fully utilizes the pressure provided by the electric oil pump for the gear shifting of the wet double clutch, can realize the gear shifting control process of the transmission under the working condition that the engine is stopped, further fully exerts the oil saving potential of a 48V micro-mixing system, and reduces the oil consumption and the emission of the whole vehicle.
Drawings
FIG. 1 is a schematic structural diagram of a 48V micro-mixing system according to an embodiment of the present invention;
FIG. 2 is a flow chart of the shutdown coordination control of the 48V micro-hybrid system in the invention;
FIG. 3 is a diagram illustrating the process of checking the rotational speed of the electric oil pump in the 48V micro-hybrid transmission of the present invention;
fig. 4 is a detailed flow chart of the start-stop coordination of the 48V micro-mixing system in the invention.
Detailed Description
Examples
Referring to fig. 1, which is an embodiment of the application of the present invention, a 48V micro-hybrid dual clutch transmission powertrain system configuration is disclosed, a BSG motor 3 is installed at the front end of an engine 1 and is connected with the engine 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 can also be started by means of the starter 8 in the event of a key-on start of the vehicle, in keeping with conventional vehicle construction. 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 pressure required by gear shifting of the transmission can be provided by rotating the electric oil pump 4 under the stop working condition of the engine 1 of the transmission 2. The 48V battery 5 and the 12V battery 7 are connected through the DCDC converter 6, and energy conversion from a 48V system to a 12V system can be realized.
As shown in fig. 2, an embodiment of the present invention provides a 48V micro-mixing system start-stop coordination control process, including:
step S100: and (4) executing the checking of the basic condition 1 of the engine stop, and checking the state of an electric system of the engine, wherein the conditions of the water temperature of the engine, the battery temperature of 48V, the electric quantity SOC of the battery, the state of a BSG motor and the like meet the basic condition 1 of the engine stop.
Step S200: and executing the transmission stop condition check, checking the conditions of a sensor of the transmission, a solenoid valve of a hydraulic actuator of the transmission, the gear engagement state of the transmission, the fault state of a clutch system, the state of an electric oil pump, whether the temperature of the transmission is within a set temperature threshold range and the like, and judging whether the transmission meets the stop condition.
Step S300: and (4) executing the checking of the basic condition 2 of the engine stop, and judging whether the basic condition 2 of the engine stop is met or not when the engine receives that the transmission meets the stop condition on the premise that the basic condition 1 of the engine stop is met.
Step S400: and executing the checking of the engine stop triggering condition, judging that the vehicle speed is lower than a set threshold value according to the brake stepping state of a driver, judging that the vehicle deceleration is within the set threshold value range, and judging the influence of the emergency braking working condition of the vehicle on the whole braking distance. And the ESP function of the vehicle is not activated, so that the vehicle is ensured to be in a low-speed deceleration braking working condition, not in a rapid deceleration working condition, and the vehicle does not have a lateral sliding tendency, and the safety of the vehicle is ensured.
Step S500: and after the transmission receives the engine stop command, executing transmission stop preparation. The transmission starts the electric oil pump, sets the rotation speed of the electric oil pump to be a fixed threshold rotation speed value, determines the threshold rotation speed of the electric oil pump by calibration, such as 3000RPM, and checks the actual rotation speed of the electric oil pump.
Step S600: as shown in fig. 3, the transmission checks that the rotational speed of the electric oil pump is within the set range, that is, in accordance with the following formula (1), indicating that the transmission stop preparation is completed.
|PumpSetspeed-PumpActualSpeed|≤ΔRPM (1)
Wherein: pumpSetSpeed represents a transmission set desired speed of the electric oil pump, pumpActualSpeed represents a transmission electric oil pump actual speed, and Δ RPM represents a steady state deviation of the transmission set speed from the electric pump actual speed, which is determined by calibration, such as: 50RPM is set.
Step S700: and after the engine receives the completion of the preparation for stopping the transmission, stopping the engine.
As shown in fig. 4, the system works normally at 48V, i.e.: the temperature of the 48V battery is in a set threshold interval, the SOC of the 48V battery is in a set threshold interval range, the engine is in a shutdown state, and an engine startup request is detected in real time.
As shown in fig. 4, when the engine detects a driver's accelerator depression request for acceleration, the engine is started.
As shown in fig. 4, the transmission detects an electric oil pump failure state in the engine off state when the engine does not detect a start request. If the transmission finds a failure in the electric oil pump and fails to provide the shift pressure required by the dual clutch transmission during engine off conditions, the transmission will immediately request an engine start.
As shown in FIG. 4, when the engine is in a stop state and receives a transmission start request, the engine is started immediately through the BSG motor of 48V, and the mechanical oil pump is driven by the engine to provide pressure required by gear shifting of the dual-clutch transmission.
As shown in FIG. 4, the transmission detects that the engine is successfully started, and the electric oil pump is turned off, so that the energy consumption of the whole vehicle is reduced.
As shown in fig. 4, in the engine off state, the engine detects no start request, the transmission checks that the electric oil pump is not faulty, and the engine off state is maintained until an engine start condition occurs, and the BSG motor of 48V starts the engine.
The invention provides a method for coordinately controlling starting and stopping of a 48V micro-hybrid system double-clutch transmission, which is characterized in that an engine checks system electrical faults, 48V battery electric quantity and 48V battery temperature, determines whether the engine supports a stopping condition or not, and judges whether a 48V micro-hybrid system meets the stopping condition or not by combining a starting and stopping state fed back by the transmission. After the stopping working condition occurs, the engine sends a stopping instruction to the transmission, and the transmission starts the electric oil pump and feeds back the stopping instruction of the engine, so that the coordinated control of the stopping process of the engine and the transmission under the 48V micro-hybrid system is realized.
Claims (1)
1. A48V micro-mixing system double-clutch transmission start-stop coordination control method is characterized by comprising the following steps:
s100: the engine is subjected to shutdown state inspection, the state of a BSG motor of a 48V system is inspected, and whether the basic condition 1 of engine shutdown is met is judged;
s200: the double-clutch transmission is subjected to shutdown state detection, the states of a transmission sensor and the fault state of a hydraulic execution solenoid valve are detected, and whether the transmission supports the start-stop state of the engine is sent to the engine;
s300: the engine judges whether the engine meets the basic stopping condition 2 or not according to the basic stopping condition 1 and the starting and stopping state fed back by the transmission;
s400: when meeting the basic condition 2 of engine stop, the engine sends a stop request instruction to the transmission after detecting that the current working condition of the vehicle meets the stop trigger condition;
s500: after the transmission receives a stop request command of an engine, clutch separation control is executed, an electric oil pump is started, and pressure required by gear shifting of the dual-clutch transmission is kept;
s600: after the transmission detects that the rotating speed of the electric oil pump is normal, the state of allowing the transmission to stop is fed back to the engine; after the engine receives the stop state fed back by the transmission, executing the stop of the engine;
s700: after the engine is stopped, the vehicle runs under the condition of stopping the engine, and the double-clutch transmission can perform transmission gear disengaging and engaging control under the condition of stopping the engine through the pressure provided by the electric oil pump;
s800: in the stopping process of the engine, the transmission checks the state of the electric oil pump in real time, when the electric oil pump is detected to have a fault, the transmission immediately requests the engine to start, and the engine drives the mechanical oil pump to provide pressure required by control for the double-clutch transmission, so that the normal operation of the whole 48V power system is guaranteed;
the engine stop basic condition 1 in the step S100 refers to checking the engine to check the current electrical system fault state, the engine water temperature, the 48V battery temperature, the battery electric quantity SOC, and the BSG motor state; if the electric system of the engine has no fault, the water temperature of the engine is in a set threshold interval, the temperature of the 48V battery is greater than a set minimum temperature threshold, the battery electric quantity SCO is greater than a set minimum threshold, and the BSG motor has no fault, the engine judges that the basic condition 1 for stopping is met;
the step S200 of checking the shutdown state of the double-clutch transmission refers to checking that a sensor of the transmission is fault-free, a hydraulic execution solenoid valve of the transmission is normal, a gear engagement state of the transmission is normal, a clutch system is fault-free, an electric oil pump is normal, and the temperature of the transmission is within a set temperature threshold range; if the engine is not in accordance with the inspection conditions, the transmission judges that the engine is not in accordance with the engine stop conditions at present, and feeds back the state to the engine through a CAN bus to inform that the engine transmission does not have the stop conditions;
the engine stop basic condition 2 in step S300 is a state in which the engine receives a feedback from the transmission to support the engine stop on the premise that the engine stop basic condition 1 is satisfied; under the condition that the engine basic condition 2 is met, the engine system and the transmission system support the engine stop condition;
in the step S400, the condition that the current working condition of the vehicle meets the engine stop triggering condition means that a driver steps on a brake, the vehicle speed is lower than a set threshold value, the vehicle deceleration is within a set threshold value range, and the ESP function of the vehicle is not activated;
the electric oil pump in the step S500 is an electric pump which continues to rotate through a 12V power supply system in the engine stop state, and provides pressure required for gear shifting of the transmission gear under the stop working condition for the wet dual-clutch transmission;
the normal rotating speed of the electric oil pump in the step S600 means that the rotating speed of the electric oil pump is preset by the transmission, the actual rotating speed of the electric oil pump is checked to reach the set rotating speed threshold range, and the transmission judges that the rotating speed of the electric oil pump is normal and can provide required pressure for the transmission to be shifted;
the step S800 of checking the state of the electric oil pump in real time by the transmission means checking whether the electric oil pump has an overvoltage, an undervoltage, an overcurrent fault, or a fault state of the sensor.
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| JP5252171B2 (en) * | 2007-09-19 | 2013-07-31 | アイシン・エィ・ダブリュ株式会社 | Vehicle control device |
| JP5225252B2 (en) * | 2009-11-12 | 2013-07-03 | 本田技研工業株式会社 | Vehicle drive source stop control device |
| US8210828B2 (en) * | 2010-03-30 | 2012-07-03 | Ford Global Technologies, Llc | Methods and systems for assisted direct start control |
| JP5862042B2 (en) * | 2010-06-28 | 2016-02-16 | マツダ株式会社 | Idle stop control device for vehicle |
| US8475335B2 (en) * | 2011-09-21 | 2013-07-02 | GM Global Technology Operations LLC | Method and apparatus for adaptive clutch control for a vehicle having engine start-stop functionality |
| CN103029708B (en) * | 2013-01-07 | 2015-08-19 | 上海汽车变速器有限公司 | Based on control method and the system thereof of driving engine start and stop |
| US9284896B2 (en) * | 2013-01-31 | 2016-03-15 | Ford Global Technologies, Llc | Method for maximizing microhybrid auto start-stop availability |
| CN103407448B (en) * | 2013-06-26 | 2016-03-30 | 上海凌翼动力科技有限公司 | Driving engine start-stop control system |
| CN104417346B (en) * | 2013-09-09 | 2017-04-12 | 比亚迪股份有限公司 | Control system and control method of hybrid electrical vehicle (HEV) |
| US9008929B1 (en) * | 2013-09-26 | 2015-04-14 | GM Global Technology Operations LLC | Method for controlling a powertrain and a transmission system |
| CN104057951A (en) * | 2014-05-28 | 2014-09-24 | 江苏万伏新能源有限公司 | Intelligent start-up and shutdown micro-mixing system and control method thereof |
| US20150344035A1 (en) * | 2014-05-28 | 2015-12-03 | Cummins Inc. | Systems and methods for controlling engine shutdown of a vehicle equipped with start-stop logic and vehicle launch |
| CN105986912A (en) * | 2015-01-30 | 2016-10-05 | 上海汽车集团股份有限公司 | Method and device for controlling automatic starting of engine |
| CN105465352B (en) * | 2015-12-31 | 2018-01-12 | 盛瑞传动股份有限公司 | A kind of automatic transmission automatic start-stop control method of Transmission System |
| CN106274885B (en) * | 2016-08-31 | 2018-07-10 | 安徽江淮汽车集团股份有限公司 | Vehicle start-up and shut-down control method |
| US10106150B2 (en) * | 2017-03-13 | 2018-10-23 | Ford Global Technologies, Llc | Methods and system for operating a hybrid vehicle |
| US10336314B2 (en) * | 2017-07-26 | 2019-07-02 | Gm Global Technology Operations Llc. | Hybrid powertrain system |
| CN108313059A (en) * | 2018-03-28 | 2018-07-24 | 浙江吉利汽车研究院有限公司 | Engine start-up and shut-down control method, apparatus and system |
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