CN108556836B - Control method for auxiliary starting engine of power-split hybrid electric vehicle brake - Google Patents
Control method for auxiliary starting engine of power-split hybrid electric vehicle brake Download PDFInfo
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- CN108556836B CN108556836B CN201810539784.3A CN201810539784A CN108556836B CN 108556836 B CN108556836 B CN 108556836B CN 201810539784 A CN201810539784 A CN 201810539784A CN 108556836 B CN108556836 B CN 108556836B
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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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- 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
- B60W20/20—Control strategies involving selection of hybrid configuration, e.g. selection between series or parallel configuration
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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
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/08—Electric propulsion units
- B60W2510/083—Torque
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Abstract
The invention provides a control method for assisting an engine to be started by a brake of a power-split hybrid electric vehicle, after the whole vehicle is electrified at high voltage, if the vehicle is judged to need to start the engine, the first brake is controlled to be unlocked, the hydraulic electric oil pump is controlled to pressurize the second brake until the second brake is locked, the locking torque of the second brake is obtained, then the vehicle controller respectively sends the first motor required torque, the second motor required torque and the preset engine required torque to the corresponding first motor controller, the second motor controller and the engine controller and correspondingly executes the torque, meanwhile, the vehicle control unit controls the second brake to output the locking torque of the second brake to the small sun gear of the double planetary gear set, when the engine speed reaches the engine ignition speed threshold value A, the engine starts oil injection and ignition until the engine is successfully ignited, and the engine is started. The method is simple, and can effectively improve the driving smoothness and the dynamic property of the whole vehicle when the hybrid electric vehicle runs.
Description
Technical Field
The invention relates to the field of control of hybrid electric vehicles, in particular to a control method for assisting in starting an engine by a power-split hybrid electric vehicle brake.
Background
The hybrid electric vehicle is used as a multi-power-source system, corresponding working modes can be selected according to different working conditions, the optimal characteristics of each power source are fully exerted, and the driving of the vehicle does not depend on an engine completely.
The hybrid electric vehicle uses electric energy and chemical energy under low-speed and small-load working conditions, and converts the electric energy and the chemical energy into mechanical power to drive the vehicle; the hybrid vehicle uses vehicle-mounted fuel (gasoline) and electric energy at medium-high speed or large load working condition, and converts the vehicle-mounted fuel (gasoline) and the electric energy into mechanical power to drive the vehicle. Therefore, in order to realize low emission and low energy consumption in the power-split hybrid electric vehicle, the working modes of the hybrid power transmission device are frequently switched under different working conditions, and the start and stop of the internal combustion engine are generated at any time along with the difference of the working conditions. The sudden change of the torque of the internal combustion engine is accompanied by the vibration of the crankshaft in the starting process of the internal combustion engine, and the vibration is transmitted through a transmission device to cause the shaking and the jerking of the whole vehicle, so that the driving comfort of the vehicle is influenced. In general, a hybrid internal combustion engine start control method is different from the start of a conventional internal combustion engine, and the hybrid internal combustion engine start does not need a starter motor and a linkage mechanism, but adopts a hybrid driving motor and a clutch with a specific function to complete the start of the engine together. Different hybrid power transmission devices have great differences in control methods due to differences in mixing degree and composition structure. For example: the general GM dual-mode system realizes the starting of the engine by controlling the opening and closing of the two clutches and combining the related control, and the engine is started by the torque-limiting clutch in Changan on Chongqing. Different control methods are adopted for different hybrid power transmission devices to ensure driving smoothness and dynamic performance of the hybrid power automobile in the working mode switching process as much as possible, and the method is the current main research direction.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a control method for assisting the starting of an engine by a power-split hybrid electric vehicle brake, which is simple and feasible and can effectively improve the driving smoothness and the dynamic property of the whole vehicle during the running of the hybrid electric vehicle.
The invention is realized by the following scheme:
a control method for assisting in starting an engine by a power-split hybrid electric vehicle brake comprises the following steps:
if the vehicle control unit detects a high-voltage starting request signal, the vehicle control unit controls a power battery high-voltage relay to be closed, and the power battery is used for electrifying the vehicle at high voltage;
II, after the whole vehicle is electrified at high voltage, the whole vehicle controller judges whether the vehicle needs to start an engine, if so, the step III is executed, otherwise, the vehicle enters a pure electric mode;
III, the vehicle controller controls the first brake B1 to be unlocked, controls the hydraulic electric oil pump to pressurize the second brake B2 until the second brake is locked and obtains a second brake locking torque, and then executes the step IV;
IV, the whole vehicle torque distribution module calculates a first motor demand torque and a second motor demand torque, then the whole vehicle controller respectively sends the first motor demand torque, the second motor demand torque and a preset engine demand torque to a corresponding first motor controller, a second motor controller and an engine controller, the first motor controller, the second motor controller and the engine controller respectively control the corresponding first motor, the second motor and the engine to execute output according to the received corresponding demand torque, meanwhile, the whole vehicle controller controls a second brake to output a second brake locking torque to a small sun wheel of a double-planet row, when the engine speed reaches an engine ignition speed threshold value A, the engine starts oil injection ignition, and simultaneously, the whole vehicle controller controls the second brake to unlock, after the engine oil injection ignition is successful, the engine is started, the engine enters a torque control mode and the vehicle enters a combined drive mode. If the engine fails to inject and ignite, the vehicle enters a pure electric mode.
In the step IV, the first motor requires torque TM1_reqThe second motor required torque T is obtained by calculation according to the formula (1)M2_reqObtained by calculation according to the formula (2),
wherein i1The transmission ratio of the front planet row is; i.e. i2The rear planet row transmission ratio; t isEng_resiIs the engine drag torque; j. the design is a squareEngIs the rotational inertia of the engine; j. the design is a squareS1Is the rotational inertia of the small sun wheel; j. the design is a squareS2Large sun wheel rotational inertia; a isEngSmall sun acceleration; t isr_optIs wheel-side drive torque, based onThe value of the formula (3) is taken,
Tr_opt＝fmid(Tr_opt_APS，Tr_opt_M1_lim，Tr_opt_M2_lim，Tr_opt_Bat_lim)………(3)，
f in formula (3)midCalculating a function, T, for the median logicr_opt_APSThe wheel side required torque is obtained by analyzing the opening degree of an accelerator pedal of a driver; t isr_opt_M1_limThe wheel edge required torque is converted according to the current capacity of the first motor M1; t isr_opt_M2_limThe wheel edge required torque is converted according to the current capacity of the second motor M2; t isr_opt_Bat_limThe wheel-side required torque is obtained by converting the maximum discharge capacity of the current power battery.
The wheel edge required torque T obtained by conversion according to the current capacity of the first motor M1r_opt_M1_limThe wheel edge required torque T obtained by calculation according to the formula (4) and converted according to the current capacity of the second motor M2r_opt_M2_limCalculating according to a formula (5) to obtain wheel edge required torque T obtained by converting the maximum discharge capacity of the current power batteryr_opt_Bat_limCalculated according to the formula (6):
wherein, TM1Is the actual torque of the first electric machine; t isM2Is the actual torque of the second electric machine; t isr_opt_memExecuting torque for the wheel edge at the previous moment; pBat_dchg_maxMaximum discharge power allowed for the battery; pBat_dchg_actlActual discharge power for the battery; omegarIs the ring gear angular velocity.
Preset engine demand torque TEng_reqThe data is obtained by calibration according to the universal characteristic curve of the engine and by combining the vehicle speed and the torque under the actual vehicle specific working condition, and the data is an expected value given after the engine capacity, the optimal control of the engine and the vehicle requirement are considered.
In the step IV, the ignition rotating speed threshold value A of the engine is 800-1000 r/min.
If the vehicle controller detects that the vehicle has an emergency acceleration request or the SOC of the power battery is lower than a pure electric threshold B or the vehicle has a high-power temperature control adjustment request, and the pure electric threshold B is 25% -30%, the vehicle controller judges that the vehicle needs to start the engine. Generally, when the opening degree of an accelerator pedal is increased from 0 to 100% in a short time, the vehicle is judged to have a sudden acceleration request; when the vehicle starts the air conditioner, the vehicle is judged to have a high-power temperature control adjustment request.
In the invention, the high-voltage starting request means that the engine starting of the power-split hybrid electric vehicle is high-voltage engine starting (a high-voltage permanent magnet motor is used) instead of a starting motor powered by an on-board 12-volt battery. The high-pressure start request signal is typically a signal request by a driver operation.
Compared with the prior art, the control method for the auxiliary starting of the engine by the power-split hybrid electric vehicle brake has the following advantages:
1. the method is simple and feasible, and the engine starting failure rate of the hybrid electric vehicle in the process of converting the pure electric to the engine starting working condition is effectively reduced;
2. the invention completely adopts a software control mode to realize the inhibition of vehicle shaking and pause and contusion caused by torsional impact in the starting process of the engine; the actual torque of the motor is used for replacing the original open-loop locking force parameter, so that the system has the function of self-adaptive parameter adjustment, the driving smoothness of the whole vehicle is improved, any hardware equipment or other related hardware parts are not required to be modified, and the cost is very low;
3. according to the invention, the wheel-side driving torque T is automatically carried out according to the current motor and battery capacities through the whole vehicle torque distribution moduler_optBy combining the torque inherent in the transmission structureThe equation realizes the decoupling calculation of the torque of the whole vehicle, so that the required torque of each power component is obtained, the method has the advantages of automation and high efficiency, and the driving dynamic property of the hybrid electric vehicle is effectively improved.
Drawings
FIG. 1 is a schematic structural view of a hybrid transmission used in the present invention;
fig. 2 is a control flowchart of a control method for assisting in starting an engine by a brake of a power-split hybrid vehicle in embodiment 1.
Detailed Description
The present invention will be further described with reference to the following examples, but the present invention is not limited to the description of the examples.
The schematic structural diagram of the hybrid power transmission device used in the present invention is shown in fig. 1, and its main components include: the engine 1 is connected with a planet carrier of the double-planet row 3 through the torsional vibration damper 2, a small sun gear S1 of the double-planet row 3 is connected with the first motor M1, a large sun gear S2 of the double-planet row 3 is connected with the second motor M2, a first brake B1 is connected with the planet carrier of the double-planet row 3, a second brake B2 is coaxial with a rotor of the first motor M1, a gear ring of the double-planet row 3 is meshed with a main speed reducer gear 4, and the double-planet row 3 has power splitting and power output functions. The structure of the hybrid power transmission device used in the present invention has been disclosed in a patent name of a hybrid power output power balancing device and a control method thereof (patent No. 200910195901. X). The hybrid power transmission device used by the invention mainly has the following working modes: electric-only mode, engine start mode, combined drive mode, and engine stall mode.
Example 1
A control method for assisting in starting an engine by a power-split hybrid electric vehicle brake is characterized in that a control flow chart is shown in figure 2 and comprises the following steps:
if the vehicle control unit detects a high-voltage starting request signal, the vehicle control unit controls a power battery high-voltage relay to be closed, and the power battery is used for electrifying the vehicle at high voltage;
and II, after the whole vehicle is electrified at high voltage, the whole vehicle controller judges whether the vehicle needs to start the engine, and if the whole vehicle controller detects that the vehicle has an emergency acceleration request or the SOC of a power battery is lower than a pure electric threshold B or the vehicle has a high-power temperature control adjustment request, and the value of the pure electric threshold B is 25%, the whole vehicle controller judges that the vehicle needs to start the engine. Step III is executed, otherwise, the vehicle enters a pure electric mode;
III, the vehicle controller controls the first brake B1 to be unlocked, controls the hydraulic electric oil pump to pressurize the second brake B2 until the second brake is locked and obtains a second brake locking torque, and then executes the step IV;
IV, the whole vehicle torque distribution module calculates a first motor demand torque and a second motor demand torque, then the whole vehicle controller respectively sends the first motor demand torque, the second motor demand torque and a preset engine demand torque to a corresponding first motor controller, a second motor controller and an engine controller, the first motor controller, the second motor controller and the engine controller respectively control the corresponding first motor, the second motor and the engine to execute output according to the received corresponding demand torque, simultaneously the whole vehicle controller controls a second brake to output a second brake locking torque to a small sun wheel of a double-planet row, when the engine speed reaches an engine ignition speed threshold value A, the engine ignition speed threshold value A takes a value of 800r/min, the engine starts oil injection and ignition, and simultaneously the whole vehicle controller controls the second brake to unlock, after the engine is successfully injected and ignited, the engine is started completely, the engine enters a torque control mode, and the vehicle enters a combined driving mode. If the engine fails to inject and ignite, the vehicle enters a pure electric mode.
In step IV, the first electric machine requires a torque TM1_reqThe second motor required torque T is obtained by calculation according to the formula (1)M2_reqObtained by calculation according to the formula (2),
t in the formulae (1) and (2)r_optWhich is the wheel-side drive torque, is taken according to equation (3),
Tr_opt＝fmid(Tr_opt_APS，Tr_opt_M1_lim，Tr_opt_M2_lim，Tr_opt_Bat_lim)………(3)，
f in formula (3)midCalculating a function, T, for the median logicr_opt_APSThe wheel side required torque is obtained by analyzing the opening degree of an accelerator pedal of a driver; t isr_opt_M1_limThe wheel edge required torque obtained by conversion according to the current capacity of the first motor M1 is obtained by calculation according to a formula (4); t isr_opt_M2_limThe wheel edge required torque obtained by conversion according to the current capacity of the second motor M2 is obtained by calculation according to a formula (5); t isr_opt_Bat_limThe wheel-side required torque obtained by conversion according to the maximum discharge capacity of the current power battery is obtained by calculation according to a formula (6):
in the formulae (1), (2), (4) and (5), i1The transmission ratio of the front planet row is; i.e. i2The rear planet row transmission ratio; t isEng_resiIs the engine drag torque; j. the design is a squareEngIs the rotational inertia of the engine; j. the design is a squareS1Is the rotational inertia of the small sun wheel; JS2 is large sun wheel rotational inertia; a isEngSmall sun acceleration; t isM1Is the actual torque of the first electric machine; t isM2Is the actual torque of the second electric machine; in the formula (6), Tr_opt_memExecuting torque for the wheel edge at the previous moment; pBat_dchg_maxMaximum discharge power allowed for the battery; pBat_dchg_actlActual discharge power for the battery; omegarIs the ring gear angular velocity.
Example 2
The steps of a control method for the brake-assisted starting of an engine of a power-split hybrid electric vehicle are basically the same as the steps of the control method for the brake-assisted starting of the engine of the power-split hybrid electric vehicle in the embodiment 1, and the difference is that: the pure electric threshold B is 30%, and the engine ignition rotating speed threshold A is 1000 r/min.
Claims (4)
1. A control method for assisting in starting an engine by a power-split hybrid electric vehicle brake is characterized by comprising the following steps: the method comprises the following steps:
if the vehicle control unit detects a high-voltage starting request signal, the vehicle control unit controls a power battery high-voltage relay to be closed, and the power battery is used for electrifying the vehicle at high voltage;
II, after the whole vehicle is electrified at high voltage, the whole vehicle controller judges whether the vehicle needs to start an engine, if so, the step III is executed, otherwise, the vehicle enters a pure electric mode;
III, the vehicle controller controls the first brake (B1) to be unlocked, controls the hydraulic electric oil pump to pressurize the second brake (B2) until the second brake is locked and obtains second brake locking torque, and then executes step IV;
IV, the whole vehicle torque distribution module calculates a first motor demand torque and a second motor demand torque, then the whole vehicle controller respectively sends the first motor demand torque, the second motor demand torque and a preset engine demand torque to a corresponding first motor controller, a second motor controller and an engine controller, the first motor controller, the second motor controller and the engine controller respectively control the corresponding first motor, the second motor and the engine to execute output according to the received corresponding demand torque, meanwhile, the whole vehicle controller controls a second brake to output a second brake locking torque to a small sun wheel of a double-planet row, when the engine speed reaches an engine ignition speed threshold value A, the engine starts oil injection ignition, and simultaneously, the whole vehicle controller controls the second brake to unlock, after the engine oil injection ignition is successful, the engine is started, the engine enters a torque control mode, and the vehicle enters a combined driving mode;
in the step IV, the first motor requires torque TM1_reqThe second motor required torque T is obtained by calculation according to the formula (1)M2_reqObtained by calculation according to the formula (2),
wherein i1The transmission ratio of the front planet row is; i.e. i2The rear planet row transmission ratio; t isEng_resiIs the engine drag torque; j. the design is a squareEngIs the rotational inertia of the engine; j. the design is a squareS1Is the rotational inertia of the small sun wheel; j. the design is a squareS2Large sun wheel rotational inertia; a isEngSmall sun acceleration; t isr_optWhich is the wheel-side drive torque, is taken according to equation (3),
Tr_opt＝fmid(Tr_opt_APS，Tr_opt_M1_lim，Tr_opt_M2_lim，Tr_opt_Bat_lim)………(3)，
f in formula (3)midCalculating a function, T, for the median logicr_opt_APSThe wheel side required torque is obtained by analyzing the opening degree of an accelerator pedal of a driver; t isr_opt_M1_limThe required torque of the wheel edge is obtained according to the conversion of the current first motor capacity; t isr_opt_M2_limThe wheel-side required torque is obtained according to the conversion of the current second motor capacity; t isr_opt_Bat_limThe wheel-side required torque is obtained by converting the maximum discharge capacity of the current power battery.
2. The power splitting mixer of claim 1The control method for assisting the starting of the engine by combining the power automobile brake is characterized in that: the wheel edge required torque T obtained according to the conversion of the current first motor capacityr_opt_M1_limThe wheel edge required torque T is obtained by calculation according to a formula (4) and is converted according to the current second motor capacityr_opt_M2_limCalculating according to a formula (5) to obtain wheel edge required torque T obtained by converting the maximum discharge capacity of the current power batteryr_opt_Bat_limCalculated according to the formula (6):
wherein, TM1Is the actual torque of the first electric machine; t isM2Is the actual torque of the second electric machine; t isr_opt_memExecuting torque for the wheel edge at the previous moment; pBat_dchg_maxMaximum discharge power allowed for the battery; pBat_dchg_actlActual discharge power for the battery; omegarIs the ring gear angular velocity.
3. The control method for the brake-assisted starting of the engine of the power-split hybrid vehicle according to claim 1, characterized in that: in the step IV, the ignition rotating speed threshold value A of the engine is 800-1000 r/min.
4. The control method for the auxiliary starting engine of the power-split hybrid vehicle brake as claimed in any one of claims 1 to 3, characterized in that: if the vehicle controller detects that the vehicle has an emergency acceleration request or the SOC of the power battery is lower than a pure electric threshold B or the vehicle has a high-power temperature control adjustment request, and the pure electric threshold B is 25% -30%, the vehicle controller judges that the vehicle needs to start the engine.
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| CN109849891B (en) * | 2019-03-15 | 2020-11-13 | 中国汽车技术研究中心有限公司 | Control method of three-mode hybrid electric vehicle |
| CN109849889B (en) * | 2019-03-25 | 2020-08-28 | 科力远混合动力技术有限公司 | Hybrid power driving mode switching control method of power split type hybrid power vehicle |
| CN109849892B (en) * | 2019-03-25 | 2020-08-28 | 科力远混合动力技术有限公司 | Pure electric drive mode switching control method of power split type hybrid vehicle |
| CN110091857B (en) * | 2019-04-25 | 2020-08-04 | 科力远混合动力技术有限公司 | Auxiliary gear shifting control method for double-planet-row deep hybrid power automobile brake |
| CN110091856B (en) * | 2019-04-26 | 2020-11-27 | 科力远混合动力技术有限公司 | Method for coordinately controlling sliding friction starting engine and accelerating gear-up of hybrid electric vehicle |
| CN110293959B (en) * | 2019-05-23 | 2022-07-08 | 科力远混合动力技术有限公司 | Hybrid power driving mode switching control method of power split type hybrid power vehicle |
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| CN101992679B (en) * | 2009-08-24 | 2013-09-25 | 上海华普国润汽车有限公司 | Double planetary row four-axis hybrid power transmission device |
| CN102019843B (en) * | 2009-09-15 | 2014-07-02 | 上海华普国润汽车有限公司 | Hybrid output power balancing device and control method thereof |
| CN102887056B (en) * | 2011-07-20 | 2015-09-09 | 科力远混合动力技术有限公司 | Bimodulus hybrid transmissions and hybrid power transmission system |
| CN104340221B (en) * | 2014-08-29 | 2017-02-08 | 科力远混合动力技术有限公司 | Energy recovery control method of double-planet-row four-axis hybrid power system |
| CN106427988B (en) * | 2016-10-28 | 2019-01-29 | 科力远混合动力技术有限公司 | Double planet wheel rows of mixing hybrid vehicle starts control method for coordinating |
| CN108725427B (en) * | 2018-05-30 | 2020-06-09 | 科力远混合动力技术有限公司 | Control method for auxiliary engine stop of clutch-free hybrid electric vehicle brake |
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