CN103935226A - Power system of range-extended hybrid electric vehicle and control method thereof - Google Patents
Power system of range-extended hybrid electric vehicle and control method thereof Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a power system of a range-extended hybrid electric vehicle. The power system comprises an ISG, an engine, an EMS and an HCU. The ISG works as a starting motor of the engine or works as a generator. The HCU is connected with the EMS through a CAN bus and an independent cable. When the ISG works as the generator, the HCU transmits a target rotation speed signal and a target torque signal of the engine to the EMS through the CAN bus. The HCU further transmits an accelerator position simulation signal to the EMS through the independent cable. The EMS controls the engine to output rotation speed to reach target rotation speed and output torque to reach target torque. It is unnecessary to directly control the ISG by the HCU in the power generation process, so that the control mode of the HCU is simplified, the development difficulty of the range-extended hybrid electric vehicle is lowered, development time is shortened, cost is saved, and reliability is improved.
Description
Technical field
The application relates to a kind of power system of stroke lengthening hybrid power automobile.
Background technology
Refer to Fig. 1, the power system of orthodox car comprises:
---driving engine, be generally engine petrol, connect the driver trains such as change speed gear box;
---sensor, comprises airmoter (or gas temperature pressure sensor), engine speed sensor, crank-position sensor etc.;
---actr, comprises inlet valve, fuel injector, ignition device etc.;
---engine management system (Engine Management System, referred to as EMS), gather the signal of each sensor, control the operation of each actr.
The control method of the power system of orthodox car is: various sensors provide desired signal for EMS, EMS is according to the air/fuel ratio demand of driving engine operation conditions, calculate the delivery quality of each working cycle, control various actrs and carry out corresponding operating, realize the balance of engine performance.The signal of described sensor comprises: airmoter or gas temperature pressure sensor detect the suction quantity of driving engine, for EMS provides air flow rate signal; Engine speed sensor provides engine rotational speed signal for EMS; Crank-position sensor provides corner signal for EMS.The operation of described actr comprises: control the point of ignition of the aperture of inlet valve, the fuel charge of controlling fuel injector and injection time, control ignition device etc.
Driving engine can be divided into idling operation and non-idling operation in the running.When idling operation, EMS adopts the control of closed loop rotating speed, and taking the rotating speed of target that sets according to engine operating condition as controlling target, the difference based on actual speed and rotating speed of target is input, suction quantity and ignition angle are carried out to PID calculating, to ensure the speed stability of driving engine.When non-idling operation, EMS adopts moment of torsion control, sets up the moment of torsion input/output model of driving engine, dynamically adjusts suction quantity and ignition angle, makes the output of driving engine actual torque follow the torque demand of chaufeur, drives moment of torsion needs to ensure that power output meets.
Refer to Fig. 2, the power system of existing stroke lengthening hybrid power automobile comprises:
---storage battery, stores electric weight, or provides the energy by power inverter to drive motor, ISG.
---drive motor, taking alternating current as power supply, be generally High Level AC Voltage, drive wheel to make Vehicle Driving Cycle.
---driving engine, only for driving ISG generating.
---integrated form actuating motor and electrical generator (Integrated starter/generator, referred to as ISG), be generally permagnetic synchronous motor, be directly integrated on the main shaft of driving engine.On the one hand, ISG, as the actuating motor of driving engine, helps engine starting.On the other hand, after normal working of engine, ISG, as electrical generator, produces alternating current by driven by engine.
---power inverter, the alternating current on the one hand ISG generating being produced is converted to direct current, for battery charge; In the time of battery discharging, the direct current (DC) of storage battery output is converted to High Level AC Voltage, as the power source of drive motor, ISG on the other hand.
---EMS, control engine running.When idling operation, EMS adopts the control of closed loop rotating speed to driving engine.When non-idling operation, EMS adopts moment of torsion control to driving engine.
---entire car controller (Hybrid Control Unit, referred to as HCU), the phase current signal of three plase alternating current and the rotor-position signal of engine rotational speed signal and ISG that while gathering ISG generating, produce, carry out exciting current control to ISG.
Stroke lengthening hybrid power automobile can work in as required electric-only mode, increase journey pattern or hybrid mode.Under electric-only mode, driving engine does not turn round, and is turned round by storage battery deposit electric weight supply drive motor completely.Increase under journey pattern, engine running drives ISG generating, turned round by this part generating electric weight supply drive motor completely, and not battery consumption deposit electric weight.Under hybrid mode, driven by engine ISG generating and storage battery are powered simultaneously, supply together drive motor running by power inverter.
When ISG works as actuating motor, requiring provides high pulling torque at slow speed of revolution Heng Niujuqu; Be to adopt autocontrol frequency Varying and speed changing method at present, rotor-position sensor is installed on motor shaft, can detect the position of magnetic pole of rotor, produce rotating field by power frequency and the phase place of controlling stator, this rotating field produces constant torque to rotor.
Refer to Fig. 3, the control method of the power system of existing stroke lengthening hybrid power automobile in the time that ISG works as electrical generator is: the phase current signal of three plase alternating current and the rotor-position signal of engine rotational speed signal and ISG that HCU produces while gathering ISG generating, carry out exciting current control to ISG.When ISG works as electrical generator, require to realize generating voltage-stabilized electricity by use.HCU adopts field weakening control method to ISG, exports to the exciting current of ISG by reduction, keeps generating voltage stable.But the rotating speed of driving engine can change in broader scope, and the weak magnetic control technical risk processed of the wide region of permagnetic synchronous motor is very large, strong and dynamic response is poor to the dependence of the ISG parameter of electric machine.As a kind of alternative, when ISG works as electrical generator, also can adopt DC-DC changer to realize generating voltage-stabilized electricity by use, but this will increase system cost, reduce generating efficiency simultaneously.
Summary of the invention
Technical problems to be solved in this application are to provide a kind of power system of stroke lengthening hybrid power automobile, in the time that ISG works as electrical generator, simplify control program, do not increase extra cost, realize equally the burning voltage output of ISG.For this reason, the application also will provide a kind of control method of power system of stroke lengthening hybrid power automobile.
For solving the problems of the technologies described above, the power system of the application's stroke lengthening hybrid power automobile comprises integrated form actuating motor and electrical generator, driving engine, engine management system, entire car controller; Described integrated form actuating motor and electrical generator or as the actuating motor work of driving engine, or as electrical generator work;
Described entire car controller is by CAN bus and independent cable connecting engine management system;
When described integrated form actuating motor and electrical generator are worked as electrical generator, entire car controller sends rotating speed of target signal and the target torque signal of driving engine to engine management system by CAN bus, entire car controller also starts to simulate accelerator pedal position signal by described independent cable to engine management system;
Described engine management system control engine output speed reaches rotating speed of target, output torque reaches target torque.
The control method of the power system of the application's stroke lengthening hybrid power automobile is: in the time that integrated form actuating motor and electrical generator are worked as electrical generator, entire car controller calculates target torque and the rotating speed of target of driving engine, and passes to engine management system by CAN bus; Entire car controller is also simulated throttle position signal with independent cable to engine management system transmission simultaneously;
In the time that the communication of CAN bus is normal, and engine management system judges that engine target rotating speed is less than or equal to the maximum speed of revolution of idling operation, driving engine adopted to the control of closed loop rotating speed, makes the rotating speed output of driving engine reach rotating speed of target;
In the time that the communication of CAN bus is normal, and engine management system judges that engine target rotating speed is greater than the maximum speed of revolution of idling operation, driving engine is adopted to closed loop rotating speed control and moment of torsion control, the control of closed loop rotating speed makes the rotating speed output of driving engine reach rotating speed of target, and moment of torsion control makes the moment of torsion output of driving engine reach target torque;
In the time that communication failure appears in CAN bus, engine management system response simulation accelerator pedal position signal makes the idling speed of driving engine stable under idling operation, makes the moment of torsion output of driving engine follow simulation throttle change in location under non-idling operation.
The application no longer need to directly be controlled the ISG in when generating by HCU, thereby has simplified the mode of HCU, thereby has reduced the development difficulty of stroke lengthening hybrid power automobile, reduces the development time, saves cost, improves reliability.
Brief description of the drawings
Fig. 1 is the structural representation of the power system of orthodox car;
Fig. 2 is the structural representation of the power system of existing stroke lengthening hybrid power automobile;
Fig. 3 is the diagram of circuit of the power system of the existing stroke lengthening hybrid power automobile control method in the time that ISG works as electrical generator;
Fig. 4 is the structural representation of the power system of the application's stroke lengthening hybrid power automobile;
Fig. 5 is the diagram of circuit of the application's the power system of the stroke lengthening hybrid power automobile control method in the time that ISG works as electrical generator.
Detailed description of the invention
Refer to Fig. 4, the power system of the application's stroke lengthening hybrid power automobile comprises:
---storage battery, this storage battery can be accepted the charging of external charging pile, industrial power, civilian power supply, also can accept the charging of the direct current of power inverter output.
---drive motor, taking alternating current as power supply, be generally High Level AC Voltage, drive wheel to make Vehicle Driving Cycle.
---driving engine, is generally engine petrol.This driving engine is only for driving ISG generating.
---ISG, be generally permagnetic synchronous motor, be directly integrated on the main shaft of driving engine.On the one hand, ISG, as the actuating motor of driving engine, helps engine starting.On the other hand, after normal working of engine, ISG, as electrical generator, is subject to driven by engine to produce alternating current.
---power inverter: the alternating current on the one hand ISG generating being produced is converted to direct current, for battery charge; In the time of battery discharging, the direct current (DC) of storage battery output is converted to High Level AC Voltage, as the power source of drive motor, ISG on the other hand.
---EMS, control engine running, when idling operation, EMS adopts the control of closed loop rotating speed to driving engine, makes driving engine output speed reach rotating speed of target.When non-idling operation, EMS adopts closed loop rotating speed control and moment of torsion control to driving engine, makes that driving engine output speed reaches rotating speed of target, engine output torque reaches target torque.
---HCU, phase current signal, simulated oil door position signal and the accumulator electric-quantity of the three plase alternating current producing when collection engine rotational speed signal, ISG generating pass through rotating speed of target signal and the target torque signal of CAN bus to EMS transmission driving engine after calculating.HCU also connects EMS by independent cable, and this independent cable passes to EMS for the simulated oil door position signal that HCU is gathered.On orthodox car, there is Das Gaspedal, adjust air inlet amount by controlling throttle opening, finally change engine speed.Corresponding on stroke lengthening hybrid power automobile is simulation Das Gaspedal, is used for expressing the driving demand of chaufeur to entire car controller and/or EMS.
Refer to Fig. 5, the control method of the power system of the application's stroke lengthening hybrid power automobile in the time that ISG works as electrical generator is: in the time that ISG works as electrical generator, phase current signal, engine rotational speed signal, simulated oil door position signal, the accumulator electric-quantity of the three plase alternating current that HCU produces while gathering ISG generating, calculate target torque T and rotating speed of target N for making the stable driving engine that drives ISG coaxial rotation of ISG generating voltage, and pass to EMS by CAN bus.Described method of calculating is: if the horsepower output of driving engine is called to P, output voltage when ISG generating is called U, and outgoing current is called I, and ISG is called η as the efficiency factor of electrical generator, has P=U × I/ η, T=9550 × P/N.In order to ensure the economy of vehicle, entire car controller, according to simulated oil door position signal and accumulator electric-quantity, determines generating voltage U and the generation current I of ISG, then determines rotating speed of target N and target torque T according to the operating characteristic of driving engine.Simultaneously, in order to ensure that when the CAN bus failure vehicle still can trouble free service, HCU also sends simulated oil door position signal Wped with independent cable to EMS, the aperture of this characterization simulation Das Gaspedal.
In the time that the communication of CAN bus is normal, EMS judges the maximum speed of revolution N of rotating speed of target N and idling operation control
0between relation.
---as rotating speed of target N≤N
0when (idling operation), EMS adopts the control of closed loop rotating speed to driving engine, taking rotating speed of target N as controlling target, taking the difference of rotating speed of target and actual speed as input, carry out PID(proportional-integral-differential) calculate after air inlet amount and the ignition angle of control engine, with the actual speed stable output that ensures driving engine in rotating speed of target N.Traditional idling operation control method that Here it is.
---as rotating speed of target N > N
0when (non-idling operation), EMS adopts the two methods of closed loop rotating speed control and moment of torsion control to driving engine.Closed loop method for controlling number of revolution is: taking rotating speed of target N as controlling target, taking the difference of rotating speed of target and actual speed as input, carry out PID calculate after air inlet amount and the ignition angle of control engine, with the actual speed stable output that ensures driving engine in rotating speed of target N.Torque control method is: taking target torque T as controlling target, target torque T is inputted to the moment of torsion input/output model of driving engine, by controlling the aperture of throttle gate, to guarantee that the output torque of driving engine reaches target torque T.Compared with traditional idling operation control method, the application on the basis of moment of torsion control in conjunction with the control of closed loop rotating speed.
In the time there is communication failure in CAN bus, EMS response simulation throttle position signal Wped, at idling operation (simulation Das Gaspedal is not operated), EMS makes the idling speed of driving engine stable; Make the output of driving engine actual torque follow simulation Das Gaspedal at non-idling operation (simulation Das Gaspedal is operated) EMS and change, drive moment of torsion needs to ensure that power output meets.The chaufeur steer mode of conventional truck that Here it is.
Compared with the power system and control method thereof of existing stroke lengthening hybrid power automobile, the application's main improvement is:
One, in the time that ISG works as electrical generator, by EMS control engine and then control by the ISG of driven by engine.HCU no longer directly controls ISG, and only need calculate rotating speed of target and the target torque of driving engine.So just alleviate the work load of HCU, can adopt lower-cost microcontroller (MCU), also can greatly reduce the software code of its execution.
Its two, in the time that ISG works as electrical generator, if engine target rotating speed exceedes the rotating speed of idling operation, EMS carrys out the output of control engine with rotating speed and moment of torsion two methods.The output voltage of so just having guaranteed the ISG that driving engine drives is steady, and avoided existing HCU to adopt the technical sophistication of field weakening control method, the shortcoming that strong to ISG parameter of electric machine dependence, dynamic response is poor, also avoid increasing the shortcoming that cost rises, generating efficiency declines that DC-DC circuit brings.
Its three, between HCU and EMS, both transmitted rotating speed of target and the target torque of driving engine by CAN bus, intend throttle position signal by independent cable transfer die again.Even if there is communication failure in CAN bus like this, still can ensure EMS to driving engine compared with the control of low degree, greatly strengthened fault-tolerance.
These are only the application's preferred embodiment, and be not used in restriction the application.For a person skilled in the art, the application can have various modifications and variations.All within the application's spirit and principle, any amendment of doing, be equal to replacement, improvement etc., within all should being included in the application's protection domain.
Claims (7)
1. a power system for stroke lengthening hybrid power automobile, comprises integrated form actuating motor and electrical generator, driving engine, engine management system, entire car controller; Described integrated form actuating motor and electrical generator or as the actuating motor work of driving engine, or as electrical generator work; It is characterized in that:
Described entire car controller is by CAN bus and independent cable connecting engine management system;
When described integrated form actuating motor and electrical generator are worked as electrical generator, entire car controller sends rotating speed of target signal and the target torque signal of driving engine to engine management system by CAN bus, entire car controller also starts simulated oil door position signal by described independent cable to engine management system;
Described engine management system control engine output speed reaches rotating speed of target, output torque reaches target torque.
2. the power system of stroke lengthening hybrid power automobile according to claim 1, also comprise storage battery, it is characterized in that: when described integrated form actuating motor and electrical generator are worked as electrical generator, phase current signal, simulated oil door position signal and the accumulator electric-quantity of the three plase alternating current that entire car controller produces while gathering engine rotational speed signal, integrated form actuating motor and electrical generator generating.
3. the power system of stroke lengthening hybrid power automobile according to claim 1, it is characterized in that, the output speed of described engine management system control engine under idling operation reaches rotating speed of target, and the output speed under non-idling operation reaches rotating speed of target, output torque reaches target torque.
4. the control method of the power system of a stroke lengthening hybrid power automobile, it is characterized in that, in the time that integrated form actuating motor and electrical generator are worked as electrical generator, entire car controller calculates target torque and the rotating speed of target of driving engine, and passes to engine management system by CAN bus; Entire car controller is also simulated throttle position signal with independent cable to engine management system transmission simultaneously;
In the time that the communication of CAN bus is normal, and engine management system judges that engine target rotating speed is less than or equal to the maximum speed of revolution of idling operation, driving engine adopted to the control of closed loop rotating speed, makes the rotating speed output of driving engine reach rotating speed of target;
In the time that the communication of CAN bus is normal, and engine management system judges that engine target rotating speed is greater than the maximum speed of revolution of idling operation, driving engine is adopted to closed loop rotating speed control and moment of torsion control, the control of closed loop rotating speed makes the rotating speed output of driving engine reach rotating speed of target, and moment of torsion control makes the moment of torsion output of driving engine reach target torque;
In the time that communication failure appears in CAN bus, engine management system response simulation throttle position signal makes the idling speed of driving engine stable under idling operation, makes the moment of torsion output of driving engine follow simulation throttle change in location under non-idling operation.
5. the control method of the power system of stroke lengthening hybrid power automobile according to claim 4, it is characterized in that, in the time that integrated form actuating motor and electrical generator are worked as electrical generator, phase current signal, simulated oil door position signal and the accumulator electric-quantity of the three plase alternating current that entire car controller produces while gathering engine rotational speed signal, integrated form actuating motor and electrical generator generating, calculate target torque and rotating speed of target for making the stable driving engine that drives ISG coaxial rotation of integrated form actuating motor and electrical generator generating voltage.
6. the control method of the power system of stroke lengthening hybrid power automobile according to claim 4, it is characterized in that, the control of closed loop rotating speed is taking the rotating speed of target of driving engine as controlling target, taking the difference of rotating speed of target and actual speed as input, carry out PID and calculate air inlet amount and the ignition angle of rear control engine, thereby make the actual speed of driving engine reach rotating speed of target.
7. the control method of the power system of stroke lengthening hybrid power automobile according to claim 4, it is characterized in that, torque control method is taking the target torque of driving engine as controlling target, target torque is inputted to the moment of torsion input/output model of driving engine, by controlling the aperture of throttle gate, make the output torque of driving engine reach target torque.
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