CN104421089A - System and method for starting engine of HEV (Hybrid Electric Vehicle) - Google Patents
System and method for starting engine of HEV (Hybrid Electric Vehicle) Download PDFInfo
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- CN104421089A CN104421089A CN201310410833.0A CN201310410833A CN104421089A CN 104421089 A CN104421089 A CN 104421089A CN 201310410833 A CN201310410833 A CN 201310410833A CN 104421089 A CN104421089 A CN 104421089A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N11/00—Starting of engines by means of electric motors
- F02N11/08—Circuits or control means specially adapted for starting of engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N2200/00—Parameters used for control of starting apparatus
- F02N2200/02—Parameters used for control of starting apparatus said parameters being related to the engine
- F02N2200/022—Engine speed
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention discloses a system and a method for starting an engine of an HEV (Hybrid Electric Vehicle). The system comprises a high-voltage battery, the engine, an ISG (Integrated Starter and Generator), a BMS (Battery Management System), an EMS (Engine Management System), a motor controller and an HCU (Hybrid Control Unit), wherein the engine is in rigid connection with the ISG, the energy of the ISG is obtained from the high-voltage battery, the HCU is used for controlling the ISG through the motor controller, battery information is obtained through the BMS, engine information is obtained through the EMS, the HCU is used for determining the starting target rotating speed, the oil injection starting and/or ignition rotating speed and whether to request to reduce the battery discharging capacity limit in a short time by the BMS or not through the battery information and the engine information, the motor controller is instructed for dragging the engine and the ISG to the target rotating speed and maintaining the target rotating speed, and the HCU is used for determining whether the starting is finished or not through a torque which is fed back by the motor controller and an engine state which is fed back by the EMS. According to the system for starting the engine of the HEV, disclosed by the invention, the system does not comprise a traditional starting engine with 12V/24V low voltage, and the ISG is also utilized for starting the engine under a low-temperature environment.
Description
Technical field
The present invention relates to Development of HEV Technology field, particularly relate to engine starting system and the method for hybrid vehicle.
Background technique
Hybrid vehicle (Hybrid Electric Vehicle, HEV) refer to the vehicle that vehicle drive train is constituted jointly by two or more single drivetrain that can operate simultaneously, the road horsepower of vehicle is provided separately or jointly by single drivetrain according to actual vehicle running state.Because of the difference of each constituent elements, arrangement and control strategy, define multiple classification form.Hybrid vehicle is because the feature of its energy-conserving and environment-protective and new energy is subject to increasing support on policy, and motor-dom is very paid close attention to hybrid vehicle, and hybrid vehicle has become an emphasis of current automotive research and exploitation.
Hybrid vehicle development in these several years is swift and violent, and in current real life, hybrid vehicle adopts traditional internal-combustion engine and motor as power source mostly, starts automobile by heat energy used in combination and electric power two cover system.According to the bind mode that mixed power drives, mixed power system is mainly divided three classes, and one is series connection type hybrid power system, and two is parallel connection type hybrid power systems, and three is series-parallel hybrid electric systems.
Existing hybrid vehicle is furnished with high-tension battery and 12V A-battery, and there is corresponding high-voltage motor and low voltage starting machine, use high-voltage motor ato unit when high-tension battery ability is higher, use when high-tension battery ability is lower low pressure (12V) Starter to realize engine start.But use 2 motors both to add cost in hybrid vehicle simultaneously, also make the front end wheel train of motor more complicated, increase power system weight, increase energy consumption.The difference on effect of high-voltage motor ato unit and low voltage starting machine ato unit is obvious simultaneously, and subjective feeling difference is obvious, is unfavorable for vehicle performance conformity.
Summary of the invention
An object of the present invention is the engine starting system providing a kind of hybrid vehicle, the hybrid electric vehicle engine that use dependence high pressure ISG motor realizes under all operating modes starts fast, cross when avoiding the traditional 12V starter motor of use and start wait for a long time, realize flexible parking automatic start-stop function fast, make full use of again the existing high-voltage motor of hybrid vehicle, reduce component.
Another object of the present invention is to the engine startup method that a kind of hybrid vehicle is provided.
The object of the invention is to be achieved through the following technical solutions: a kind of engine starting system of hybrid vehicle, comprise high-tension battery, motor, ISG(Integrated Starter and Generator, integrated starter and generator), BMS(Battery Management System, battery management system), EMS(Engine Management System, engine management system), electric machine controller, HCU(Hybrid Control Unit, mixed power whole-control system), wherein, described motor and described ISG are rigidly connected, described ISG obtains energy from described high-tension battery, described HCU is by ISG described in described motor controller controls, battery information is obtained by described BMS, engine information is obtained by described EMS, whether described HCU determines start rotating speed of target and commencement of fuel injection and/or fire speed and ask the described BMS short time to loosen battery discharge capabilities limits by battery information and engine information, and described motor and described ISG are dragged to rotating speed of target and maintain by electric machine controller described in instruction, whether the moment of torsion that described HCU is fed back by described electric machine controller and the engine condition that described EMS feeds back are determined to start and are terminated.
Further, in the engine starting system of hybrid electric vehicle of the present invention, described battery information comprises battery discharge ability and nuclear power state.
Further, in the engine starting system of hybrid electric vehicle of the present invention, described engine information comprises engine coolant temperature.
Further, in the engine starting system of hybrid electric vehicle of the present invention, whether described HCU determines to start rotating speed of target and commencement of fuel injection and/or fire speed and ask the described BMS short time to loosen battery discharge capabilities limits to be achieved in that first described HCU receives battery discharge ability and the state-of-charge information of described BMS feedback by battery information and engine information, when battery discharge limited ability or state-of-charge too low time, described HCU sends the short time to described BMS and loosens the request of battery discharge capabilities limits, the interval V1 of lower startup rotating speed of target and commencement of fuel injection and/or fire speed is set simultaneously, receive the engine coolant temperature information that described EMS feeds back, determine to start rotating speed of target and commencement of fuel injection and/or fire speed in V1 interval, described engine coolant temperature is higher, setting start rotating speed of target and commencement of fuel injection or and/or fire speed higher, when in all normal situation of battery discharge ability and state-of-charge, the interval V2 of higher startup rotating speed of target and commencement of fuel injection and/or fire speed is set, receive the engine coolant temperature information that described EMS feeds back, determine to start rotating speed of target and commencement of fuel injection and/or fire speed in V2 interval, it is higher that the higher setting of described engine coolant temperature starts rotating speed of target and commencement of fuel injection and/or fire speed.
An engine startup method for hybrid electric vehicle, comprises following steps: the first step: HCU collects the battery discharge ability fed back of BMS and EMS and nuclear power state and engine coolant temperature information; Whether second step: described HCU judges information, determine start rotating speed of target and commencement of fuel injection and/or fire speed and ask the described BMS short time to loosen battery discharge capabilities limits; 3rd step: motor and ISG are dragged to rotating speed of target and maintain by described HCU command motor controller; 4th step: whether the moment of torsion that described HCU is fed back by described electric machine controller and the engine condition that described EMS feeds back are determined to start and terminated.
Further, in the engine startup method of hybrid electric vehicle of the present invention, described second step is achieved in that described HCU judges information, when battery discharge limited ability or state-of-charge too low time, send the short time to described BMS and loosen the request of battery discharge capabilities limits, the interval V1 of lower startup rotating speed of target and commencement of fuel injection and/or fire speed is set simultaneously, receive the engine coolant temperature information that described EMS feeds back, determine to start rotating speed of target and commencement of fuel injection and/or fire speed in V1 interval, it is higher that the higher setting of described engine coolant temperature starts rotating speed of target and commencement of fuel injection and/or fire speed, when in all normal situation of battery discharge ability and state-of-charge, the interval V2 of higher startup rotating speed of target and commencement of fuel injection and/or fire speed is set, receive the engine coolant temperature information that described EMS feeds back, determine to start rotating speed of target and commencement of fuel injection and/or fire speed in V2 interval, it is higher that the higher setting of described engine coolant temperature starts rotating speed of target and commencement of fuel injection and/or fire speed.
Adopt engine starting system and the method for the hybrid vehicle in the present invention, compared with existing start up system, start up system of the present invention does not comprise traditional Starter of low pressure 12V/24V, even if at low ambient temperatures, utilizes ISG ato unit yet.Start up system of the present invention can in normal conditions, fast, colleges and universities, smooth-going piloting engine, simultaneously under extreme operating condition, also farthest can provide the starting capability of motor.The present invention only utilizes the parts in hybrid power automobile power system, does not need traditional actuating motor and corresponding wire harness, reduces cost, weight.
Accompanying drawing explanation
Fig. 1 is hybrid electric vehicle engine quick start system block diagram of the present invention.
Embodiment
Be described in further details technical solution of the present invention below in conjunction with drawings and Examples, following examples do not form limitation of the invention.
Fig. 1 shows hybrid electric vehicle engine quick start system of the present invention, it comprises motor 2, with the integrated starter-generator of the rigidly connected high pressure of motor 2 (Integrated Starter and Generator, also integrated starter and generator is called, general abbreviation ISG) 3, and the high-tension battery 1 to be connected by high-voltage wiring harness with ISG 3, also comprise entire car controller (Hybrid Control Unit, also mixed power whole-control system is called, general abbreviation HCU) 7, connect the electric machine controller 6 of HCU 7 and ISG 3, connect engine management system (the Engine Management System of HCU 7 and motor 2, general abbreviation EMS) 5, and battery management system (Battery Management System, general abbreviation BMS) 4, BMS 4 respectively with high-tension battery 1, electric machine controller 6 is connected with HCU 7.
Compared with existing start up system, start up system of the present invention does not comprise traditional Starter of low pressure 12V/24V, even if at low ambient temperatures, utilizes ISG ato unit yet.
Wherein, the operating mode of HCU 7 residing for the information determination engine start obtained from BMS 4 and EMS 5, generally includes two kinds of situations: 1, battery discharge ability and state-of-charge normal; 2, battery discharge limited ability or state-of-charge too low.
One of situation: under battery discharge ability and the normal situation of state-of-charge, namely battery discharge ability higher than electronic rate needed for ato unit and battery charge state in battery name operation interval.Said " nominal operation interval " is within the scope of battery design DOD herein, as energy type lithium cell is generally 15% ~ 100%SOC.In this case, hybrid electric vehicle engine starting method of the present invention is as described below.
Step 1:HCU 7 determines the rotating speed of target of engine start and the rotating speed of commencement of fuel injection and/or igniting.
By engine coolant temperature determination basic target rotating speed and oil spout fire speed, when coolant water temperature is higher, use higher rotating speed of target and oil spout fire speed, in order to efficient ato unit, the rotating speed of target of setting and oil spout fire speed are all apparently higher than the minimum stable idling of motor.In one embodiment, higher rotating speed of target refers to and independently starts rotating speed far above conventional engines, and generally reaching conventional engines start-up course, to start the maximum speed of speed curves interval, as 1000 ~ 1300rpm.
According to this rotating speed of target of operating conditions correction possible after engine start, as needed to access transmission system after ato unit, start rotating speed of target to the correction of current transmission input shaft rotating speed.
Step 2:HCU 7 controls the integrated starter-generator 3 of high pressure by electric machine controller 6, motor 2 is dragged to engine start rotating speed of target together with ISG 3 and maintains this rotating speed.
Step 3: in the process that rotating speed controls, motor 2 rotating speed higher than the oil spout calculated or (and) after fire speed, instruction EMS 5 makes motor enter mode of operation, and keeps this instruction, even if engine speed is again lower than oil spout speed of ignition.
Step 4: when HCU 7 detects that electric machine controller 6 is less than the surface friction drag moment of torsion certain numerical value of motor self for the moment of torsion of speeds control, and EMS 5 detects that the successful oil spout of motor 2 is lighted a fire after certain number of times, and engine starting process terminates.
Step 5: the time T whether exceeding setting cumulative time judging engine starting process, when exceeding limit value T cumulative time, cancels engine starting process, can start by retry immediately, namely return step 1.If not having overtime T to be starts successfully, engine starting process terminates.
The number of times that retry starts is limited in a key circulation, is generally restricted to 2 ~ 4 times.
Cumulative time, limit value was relevant to engine cooling water temperature, and cooling water temperature is lower, and limit value is larger.
Situation two: when battery discharge limited ability or state-of-charge too low, namely battery discharge ability lower than the electric power needed for ato unit or battery state-of-charge lower than battery name operation interval lower in limited time, engine startup method of the present invention is as described below.
Step 1:HCU 7 according to engine cooling water temperature set a lower engine start rotating speed of target and commencement of fuel injection or (and) engine speed of lighting a fire.
Oil spout or (and) fire speed according under present engine cooling water temperature, motor by oil spout or (and) igniting can be autonomous the minimum speed entering stable operation determine.Start rotating speed of target higher than oil spout or (and) fire speed, a little less than minimum stable idling speed.
Step 2: after determining rotating speed of target and oil spout fire speed, HCU 7 sends request to BMS 4, the short time loosens the minimum electric power needed for battery discharge capabilities limits to ato unit.
Step 3:HCU 7 command motor controller 6 couples of ISG 3 carry out speeds control, motor 2 are dragged to together with ISG 3 rotating speed of target of engine start and attempt to maintain this rotating speed.
Step 4: in the process that rotating speed controls, motor 2 rotating speed higher than the oil spout calculated or (and) after fire speed, instruction EMS 5 makes motor enter mode of operation, and keeps this instruction, even if engine speed is again lower than oil spout speed of ignition.
Step 5: when HCU 7 detects that electric machine controller 6 is less than the surface friction drag moment of torsion certain numerical value of motor self for the moment of torsion of speeds control, and EMS 5 detects that the successful oil spout of motor 2 is lighted a fire after certain number of times, and engine starting process terminates.Cancel the request loosening battery discharge capabilities limits to BMS 4 simultaneously.
Setting a timer for detecting the cumulative time of engine starting process, when cumulative time exceedes limit value, cancelling engine starting process.Cumulative time, limit value was relevant to engine cooling water temperature, and cooling water temperature is lower, and limit value is larger.
If engine starting process is cancelled, then cancels and the rotating speed of ISG 3 is controlled, cancel the request loosening battery discharge capabilities limits to BMS 4.
If engine starting process failure, then, when battery does not have to obtain external charge or battery discharge power restriction does not recover, this engine starting process is only allowed to attempt certain number of times.
No matter situation 1 or situation 2, if ISG motor at the appointed time in do not realize the target velocity of speeds control, and do not reach yet oil spout or (and) minimum speed of lighting a fire time, as long as the rotating speed of motor can be identified by EMS, and complete synchronous, HCU also instructing engine enters normal mode of operation, attempts independently starting.
Above embodiment is only in order to illustrate technological scheme of the present invention but not to be limited; when not deviating from the present invention's spirit and essence thereof; those of ordinary skill in the art are when making various corresponding change and distortion according to the present invention, but these change accordingly and are out of shape the protection domain that all should belong to the claim appended by the present invention.
Claims (12)
1. the engine starting system of a hybrid vehicle, comprise high-tension battery (1), motor (2), ISG(3), BMS(4), EMS(5), electric machine controller (6), HCU(7), it is characterized in that: described motor (2) and described ISG(3) be rigidly connected, described ISG(3) obtain energy from described high-tension battery (1), described HCU(7) control described ISG(3 by described electric machine controller (6)), by described BMS(4) obtain battery information, by described EMS(5) obtain engine information, described HCU(7) determine start rotating speed of target and commencement of fuel injection and/or fire speed and whether ask the described BMS4 short time to loosen battery discharge capabilities limits by battery information and engine information, and electric machine controller described in instruction (6) is by described motor (2) and described ISG(3) drag to rotating speed of target and maintain, described HCU(7) moment of torsion that fed back by described electric machine controller (6) and described EMS(5) whether the engine condition fed back determine to start and terminate.
2. the engine starting system of hybrid vehicle according to claim 1, it is characterized in that, described battery information comprises battery discharge ability and nuclear power state.
3. the engine starting system of hybrid vehicle according to claim 1, it is characterized in that, described engine information comprises engine coolant temperature.
4. according to claim 1, the engine starting system of the hybrid vehicle described in 2 or 3, it is characterized in that, described HCU(7) determine to start rotating speed of target and commencement of fuel injection and/or fire speed by battery information and engine information, and whether ask described BMS(4) short time loosens battery discharge capabilities limits and is achieved in that first described HCU(7) receive described BMS(4) the battery discharge ability fed back and state-of-charge information, when battery discharge limited ability or state-of-charge too low time, described HCU(7) to described BMS(4) send the short time and loosen the request of battery discharge capabilities limits, the interval V1 of lower startup rotating speed of target and commencement of fuel injection and/or fire speed is set simultaneously, receive described EMS(5) the engine coolant temperature information fed back, determine to start rotating speed of target and commencement of fuel injection and/or fire speed in V1 interval, described engine coolant temperature is higher, setting start rotating speed of target and commencement of fuel injection or and/or fire speed higher, when in all normal situation of battery discharge ability and state-of-charge, the interval V2 of higher startup rotating speed of target and commencement of fuel injection and/or fire speed is set, receive described EMS(5) the engine coolant temperature information fed back, determine to start rotating speed of target and commencement of fuel injection and/or fire speed in V2 interval, it is higher that the higher setting of described engine coolant temperature starts rotating speed of target and commencement of fuel injection and/or fire speed.
5. the engine starting system of hybrid vehicle according to claim 4, it is characterized in that, according to this rotating speed of target of operating conditions correction possible after engine start, as needed to access transmission system after ato unit, start rotating speed of target to the correction of current transmission input shaft rotating speed.
6. the engine starting system of hybrid vehicle according to claim 1, it is characterized in that, described system also comprises a timer for detecting the cumulative time of engine starting process, when cumulative time exceedes limit value, cancels engine starting process.
7. the engine starting system of hybrid vehicle according to claim 6, is characterized in that, described cumulative time limit value relevant to engine cooling water temperature, cooling water temperature is lower, and limit value is larger.
8. an engine startup method for hybrid vehicle, is characterized in that, comprises following steps:
The first step: HCU(7) collect BMS(4) and EMS(5) the battery discharge ability fed back and nuclear power state and engine coolant temperature information;
Second step: described HCU(7) judge information, determine start rotating speed of target and commencement of fuel injection and/or fire speed and whether ask described BMS(4) short time loosens battery discharge capabilities limits;
3rd step: described HCU(7) command motor controller (6) drags to rotating speed of target by motor (2) and ISG(3) and maintains;
4th step: described HCU(7) moment of torsion that fed back by described electric machine controller (6) and described EMS(5) whether the engine condition fed back determine to start and terminate.
9. the engine startup method of hybrid vehicle according to claim 8, it is characterized in that, described second step is achieved in that described HCU(7) judge information, when battery discharge limited ability or state-of-charge too low time, to described BMS(4) send the short time and loosen the request of battery discharge capabilities limits, the interval V1 of lower startup rotating speed of target and commencement of fuel injection and/or fire speed is set simultaneously, receive described EMS(5) the engine coolant temperature information fed back, determine to start rotating speed of target and commencement of fuel injection and/or fire speed in V1 interval, it is higher that the higher setting of described engine coolant temperature starts rotating speed of target and commencement of fuel injection and/or fire speed, when in all normal situation of battery discharge ability and state-of-charge, the interval V2 of higher startup rotating speed of target and commencement of fuel injection and/or fire speed is set, receive described EMS(5) the engine coolant temperature information fed back, determine to start rotating speed of target and commencement of fuel injection and/or fire speed in V2 interval, it is higher that the higher setting of described engine coolant temperature starts rotating speed of target and commencement of fuel injection and/or fire speed.
10. the engine startup method of hybrid vehicle according to claim 8, it is characterized in that, according to this rotating speed of target of operating conditions correction possible after engine start, as needed to access transmission system after ato unit, start rotating speed of target to the correction of current transmission input shaft rotating speed.
The engine startup method of 11. hybrid vehicles according to claim 8, it is characterized in that, described method also comprises and arranges a timer for detecting the cumulative time of engine starting process, when cumulative time exceedes limit value, cancels engine starting process.
The engine startup method of 12. hybrid vehicles according to claim 11, is characterized in that, described cumulative time limit value relevant to engine cooling water temperature, cooling water temperature is lower, and limit value is larger.
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