CN101070791A - Control system of HCCI/SI double-mode harmonization press-combustion engine and method therefor - Google Patents

Control system of HCCI/SI double-mode harmonization press-combustion engine and method therefor Download PDF

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CN101070791A
CN101070791A CN 200710057618 CN200710057618A CN101070791A CN 101070791 A CN101070791 A CN 101070791A CN 200710057618 CN200710057618 CN 200710057618 CN 200710057618 A CN200710057618 A CN 200710057618A CN 101070791 A CN101070791 A CN 101070791A
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hcci
combustion
ignition
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CN100560963C (en
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谢辉
赵华
周能辉
张岩
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Tianjin University
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Abstract

This invention relates to HCCI / SI dual-mode engine control systems and control methods. Based on SCM and CAN Bus, HCCI / SI dual-mode engine distributing control systems includes engine management unit, the fuel injection control unit ignition, valve train control unit and combustion information collection and analysis modules. HCCI / SI dual-mode HCCI engine control method uses a hierarchical closed-loop management strategies, dividing control of the whole engine into load control, combustion control and the control of phase three levels, which have adopted corresponding closure central control. The present invention considers the engine load control as the main line, by controlling the combustion phase to ensure the stability of HCCI combustion. The invention controls each loop separately, streamlining its coupling relations. The idea of closed-loop hierarchical control is not only of clear, easy to implement, but also especially helps improve the robustness of the control system.

Description

The control system of the double mode homogeneity compression-ignition engine of HCCI/SI and method
Technical field
The invention belongs to the Electrical Control Technology field that combustion engine inflammable mixture or its component are supplied with, double mode homogeneity compression-ignition engine control system of particularly a kind of HCCI/SI and controlling method.
Background technique
Homogeneous-charge compression-ignition catch fire (HCCI) burning be a kind of combustion manner that reaches its maturity, it combines the advantage of petrol engine and diesel engine.At present, main both at home and abroad fuel, EGR or the inner residual gas of direct air inlet heating, high compression ratio, the easier involuntary ignition of use of using realized the HCCI burning, and the internal exhaust gas recirculation strategy is considered to realize on the four-stroke gasoline engine the most feasible method of HCCI burning.The basic thought of internal exhaust gas recirculation control petrol engine HCCI combustion process is to catch a part of hot residual gas in cylinder by changing valve timing, uses its heating air inlet, finishes compression autoignition and catches fire.
Compare with the burning of compression-ignited (CI) with spark-ignition type (SI), the SI motor is that the CI motor is to control ignition timing by oil spout by plug ignition control combustion phase, and hcci engine lacks the Control Parameter of directly controlling the phase place of catching fire.Therefore it is relatively more responsive to initial conditions.In case initial conditions forms, there has not been alternate manner can influence its ignition timing, thereby based on the HCCI of internal exhaust gas recirculation burning mainly is to control the load of motor and the phase place of catching fire by the molded lines of inlet and exhaust valve, it is had higher requirement to motor and control system thereof and method.Not to the accurate control of inlet and exhaust valve molded lines and air fuel ratio, may exist catch fire, phenomenon such as high pressure of explosion and high voltage rise rate, high pressure of explosion and high voltage rise rate may be damaged motor and bring higher NO xDischarging.HCCI is because its scope is narrower simultaneously, can not under the full operating mode of motor, move, therefore also must allow motor (double mode homogeneity compression-ignition engine) be in the double mode operation down of HCCI/SI, promptly low, in and use the HCCI pattern under the cruise mode, cold start-up, idling and high load use the SI pattern down.Therefore in the whole working condition of motor, need accurately control molded lines, ignition advance angle and the air fuel ratio etc. of intake and exhaust.Calendar year 2001, U.S. Department of Energy proposes the HCCI combustion mode and still has 9 big difficult points, wherein just spells out: problems such as control system and controlling method wait to solve.
At present, main both at home and abroad adopt the centralized control method and with PC as control unit, the control algorithm that is adopted is too complicated, aspect real-time and validity, from the certain distance of the existence of practicability.The control of double mode homogeneity compression-ignition engine is comparatively complicated again, is the system of a multiple-input and multiple-output, and it has the coupled characteristic of process, and promptly each controlled quentity controlled variable all can influence all controlled volumes.Generally all adopt multivariable Control strategy and Model Predictive Control in this case such as decoupling zero control, but association and the complicated amount of calculation of these control strategies between all must at first understanding between control loop.Double mode homogeneity compression-ignition engine and combustion process thereof are very complicated a system and a process thereof, be difficult to set up the transfer function between input and the output thereof, promptly enable to utilize the working procedure of motor to set up model, control units such as predictive control use a model, it is too complicated to cause controlling computing, because double mode homogeneity compression-ignition engine is used on the vehicle of reality, must guarantee the real-time of control, thereby adopt computer at present both at home and abroad as control unit machine controlling method, also there is ignition timing control problem in the present HCCI practicability of solution, variable parameter operation control problem, also there is certain distance in problems such as control system, also rest on the laboratory research stage.
Summary of the invention
In view of the above problems, the purpose of this invention is to provide double mode homogeneity compression-ignition engine control system of a kind of HCCI/SI and controlling method.Be used for solving the control system and the controlling method problem of the practicability process of double mode homogeneity compression-ignition engine, realize to the double mode homogeneity compression-ignition engine of HCCI/SI in whole car operating conditions in real time, reliable control.
The double mode homogeneity compression-ignition engine control system of a kind of HCCI/SI of the present invention comprises:
Combustion information collection analysis unit 3, be used to gather the cylinder pressure and the ion current signal of the double mode homogeneity compression-ignition engine of HCCI/SI, calculate real-time combustion information feedback, engine management unit 1 calculates parameters such as inlet and exhaust valve lift, phase place and ignition advance angle, fuel injection pulsewidth according to torque demand, engine operating condition and real-time combustion information, and sending to full changeable air valve control unit 4 and oil spout ignition control unit 5 respectively by the CAN bus, Control Parameter is also uploaded to PC 2 in engine management unit 1 simultaneously;
Full changeable air valve control unit 4, inlet and exhaust valve lift, phase value that receptive pattern engine management unit 1 sends, finish inlet and exhaust valve lift, phase place closed loop control, and the inlet and exhaust valve lift, phase place of uploading motor reality are given engine management unit 1 to the double mode homogeneity compression-ignition engine 6 of HCCI/SI;
Oil spout ignition control unit 5, accept ignition advance angle, fuel injection pulsewidth value that engine management unit 1 sends, finish closed loop control, and the parameters such as suction pressure, temperature of uploading motor reality are given engine management unit 1 to the double mode homogeneity compression-ignition engine 6 of HCCI/SI;
Engine management unit 1, accept engine combustion information and status parameter by the CAN bus, carry out close-loop feedback control, Control Parameter after calculating is sent to other two control units by the CAN bus, finish the control of intake and exhaust phase place, lift, time of ignition and fuel injection quantity, realize quick in whole engine operation condition, accurate, the stable control of the double mode homogeneity compression-ignition engine of HCCI/SI; The engine management unit transmits the status parameter and the state of a control thereof of motor simultaneously to PC 2 simultaneously.
Comprise in the above-mentioned engine management unit 1:
Load control module 8, decide the mode of operation of motor according to the actual IMEP of the rotating speed of motor, driver's 7 torque demands and combustion information collection analysis unit 3 feedbacks, under different combustion modes, adopt different load control strategies, and calculate the inlet and exhaust valve parameter of motor this moment;
CA50 optimizes rule module 9, according to the rotating speed and the load optimization hcci engine 17 best CA50 value at this moment of different motors;
Load parameter estimation module 10 is in order to make quick, the accurately control of combustion phase, according to motor current working state on-line optimization combustion phase Control Parameter;
Combustion phase control module 11 calculates the Control Parameter of hcci engine 17 according to different engine working modes and CA50 value;
Full changeable air valve control comprises inlet and exhaust valve lift and phase control module 15 in the unit 4; Comprise air inflow prediction and fuel injection quantity calculating 14 and air fuel ratio control module 16 in the oil spout ignition control unit 5.
The double mode homogeneity compression-ignition engine control system of above-mentioned HCCI/SI is the double mode homogeneity compression-ignition engine distributed control system of a kind of HCCI/SI based on single-chip microcomputer and CAN bus, and the control task of complexity is assigned in each control unit.
The double mode homogeneity compression-ignition engine controlling method of a kind of HCCI/SI, it is characterized in that adopting the strategy of layering closed loop management, the double mode homogeneity compression-ignition engine control of whole HCCI/SI is divided into load control, combustion phase control and three levels of mechanism controls, and three levels all adopt corresponding closed-loop control; Load with motor is controlled to be main line, guarantees the stability of HCCI burning by the control combustion phase, optimizes the fuel economy of motor, finishes management to whole hcci engine by the control of mechanism at last.
The double mode homogeneity compression-ignition engine controlling method of above-mentioned HCCI/SI comprises the steps:
(1) load control:
Load control module 8 in the engine management unit 1 decides the mode of operation of motor according to the actual IMEP of rotating speed, driver's 7 torque demands and combustion information collection analysis unit 3 feedbacks of motor, under different combustion modes, adopt different load control strategies, and calculate the inlet and exhaust valve parameter of motor this moment;
(2) combustion phase control:
IMEP and rotating speed according to motor, the optimum value of the CA50 of the best of CA50 optimization rule module 9 optimization motors, simultaneously for combustion phase control fast, stable, according to the controller parameter of the load parameter estimation module 10 online adjustment combustion phase CA50 of motor; Finish closed loop control according to the CA50 value of the reality of combustion information collection analysis unit 3 feedback by combustion phase control module 11 to CA50;
(3) mechanism controls:
At last, parameters such as inlet and exhaust valve lift, phase place and the air fuel ratio that calculates by load control module 8 and combustion phase control module 11, ignition advance angle by air inflow prediction and the fuel injection quantity that the CAN bus sends to mechanism controls layer in oil spout ignition control unit 5 and the full changeable air valve control unit 4 respectively calculate 14, air fuel ratio control module 16 is finished with valve lift and phase place closed loop control module 15 waits and carry out; Finish close-loop feedback control to the double mode homogeneity compression-ignition engine of HCCI/SI.
The present invention is controlled to be main line with the load of motor, guarantees the stability of HCCI burning by the control combustion phase, optimizes the fuel economy of motor, finishes management to whole double mode homogeneity compression-ignition engine by the control of mechanism at last.This thought has realized each loop is controlled separately, simplifies its coupled relation.The thought of this layering closed loop control, not only clear in structure is easy to realize, and especially is beneficial to the robustness that improves control system.
Description of drawings
Fig. 1 is the double mode homogeneity compression-ignition engine control system of a HCCI/SI block diagram;
Fig. 2 is the double mode homogeneity compression-ignition engine closed-loop feedback of a HCCI/SI hierarchical control method;
Fig. 3 is the double mode homogeneity compression-ignition engine operating conditions of HCCI/SI figure;
Embodiment
It is following that the present invention is further illustrated with reference to accompanying drawing 1-Fig. 3 and by specific embodiment.Homogeneous compression-ignition catches fire, and is a kind of spark ignition that obviously is different from, with the novel combustion manner of flame propagation combustion.The applied motor of the present invention utilizes fully variable valve actuator for air, by to valve lift and Comprehensive Control regularly, realizes the negative valve overlap angle, obtains a certain amount of high temperature exhaust gas.Abundant high temperature exhaust gas in intake process, is mixed with incoming mixture, and to its heating.When Piston Compression near the top dead center sometime, inflammable mixture reaches spontaneous ignition temperature, a plurality of points catch fire simultaneously, synchronousing combustion heat release acting.Thereby the mixed gas state has directly influenced HCCI burning ignition timing in the IC Intake Valve Closes moment and the cylinder.Thereby need realize accurate in real time control to inlet and exhaust valve lift, phase place, fuel injection pulsewidth, ignition advance angle and throttle opening etc.
Control system of the present invention belongs to distributed control system, couples together by the CAN bus between the controller and carries out data communication, and complicated control task is assigned in each control unit.Oil spout ignition control unit 5 is responsible for gathering igniting, oil spout, closure control and the air fuel ratio closed loop control of basic running state parameter (λ, throttle position, intake temperature, pressure, flow) of motor and responsible motor.Inlet and exhaust valve lift and phase control instruction are responsible for carrying out in full changeable air valve control unit 4, and intake and exhaust lift and phase place mechanism are carried out closed loop control.Finish reliable, accurately control to intake and exhaust lift and phase place.Combustion information collection analysis unit 3 is responsible for gathering engine cylinder pressure signal or ion current signal, calculates the eigenvalue of burning, provides combustion information closed-loop feedback signal to control algorithm.Carry out close-loop feedback control, Control Parameter after calculating is sent to other two control units by the CAN bus, finish the control of intake and exhaust phase place, lift, time of ignition and fuel injection quantity, realize double mode homogeneity compression-ignition engine quick, stable operation in whole engine operation condition.HCCI/SI mode engine management unit transmits the status parameter and the state of a control thereof of motor simultaneously to PC 2 simultaneously.
For idling and running on the lower load (I district among Fig. 3), because stablizing the pressuring combustion ignition condition is difficult to set up, need the spark ignition combustion mode operation of motor according to routine, utilize the air inflow of intake valve lift control motor, when operating conditions that driver's 7 accelerator pedals make motor by figure three in the A point when the B point is mobile, at this moment, fixedly exhaust valve is motionless, and load control module 8 calculates IO Intake Valve Opens and close moment according to torque demand and current motor IMEP by the closed-loop feedback algorithm.And then CA50 optimizes rule model 9 and can calculate the CA50 angle an of the best according to current engine operating condition, and combustion phase control module 11 calculates ignition advance angle according to the optimization angle of CA50 and current CA50 value by closed loop control algorithm again.Results such as inlet and exhaust valve parameter of calculating and ignition advance angle send into parameter optimization module 12, carry out the closed loop control of engine breathing door lift and phase place by inlet and exhaust valve lift and phase control module 15 again, can calculate the every circuit fuel injection quantity of motor by current engine condition and inlet and exhaust valve parameter by air inflow prediction and fuel injection quantity computing module 14 simultaneously, realized closed loop control by air fuel ratio control algorithm 16, finished accurate control time of ignition by oil spout ignition control unit 5 to air fuel ratio.Finish close-loop feedback control to double mode homogeneity compression-ignition engine 17.
When the operating conditions of motor entered B point zone shown in Figure 3 (II district among Fig. 3), motor carried out the transition to the operation of HCCI burning operating conditions, utilized the close moment of exhaust valve to control the load that the interior residual gas of engine cylinder is controlled motor.The control module 8 of loading this moment calculates the close moment of exhaust valve by the closed-loop feedback algorithm according to the motor IMEP of torque demand and combustion information collection analysis unit 3 feedbacks.And then CA50 optimizes rule model 9 and can calculate the CA50 angle an of the best according to current HCCI combustion condition, and combustion phase control module 11 calculates the opening and closing moment of intake valve again by closed loop control algorithm according to the CA50 value of the optimization angle of CA50 and combustion information collection analysis unit 3 feedbacks.Results such as inlet and exhaust valve parameter of calculating and ignition advance angle send into module 12, carry out the closed loop control of engine breathing door lift and phase place by module 15 again, can calculate the every circuit fuel injection quantity of motor by current engine condition and inlet and exhaust valve parameter by air inflow prediction and fuel injection quantity computing module 14 simultaneously, realized closed loop control by air fuel ratio control algorithm 16, finished close-loop feedback control double mode homogeneity compression-ignition engine 17 to air fuel ratio.
When driver 7 continues accelerator pedal, motor need be under higher load condition during (the D point among Fig. 3) running, because the restriction of the characteristics of HCCI burning own, violent burning takes place easily, make engine operation rough, for fear of the generation of above-mentioned situation, motor need be transformed into again under the conventional spark-ignition mode and move.At this moment, control system need be controlled motor according to the mode of SI burning again, controls the load of SI burning by adjusting intake valve lift and phase place, adjusts ignition advance angle and controls ignition timing.

Claims (5)

1, the double mode homogeneity compression-ignition engine control system of a kind of HCCI/SI comprises:
Combustion information collection analysis unit (3), be used to gather the cylinder pressure and the ion current signal of the double mode homogeneity compression-ignition engine of HCCI/SI, calculate real-time combustion information feedback, engine management unit (1) calculates parameters such as inlet and exhaust valve lift, phase place and ignition advance angle, fuel injection pulsewidth according to torque demand, engine operating condition and real-time combustion information, and sending to full changeable air valve control unit (4) and oil spout ignition control unit (5) respectively by the CAN bus, Control Parameter is also uploaded to PC (2) in while engine management unit (1);
Full changeable air valve control unit (4), inlet and exhaust valve lift, phase value that receptive pattern engine management unit (1) sends, finish inlet and exhaust valve lift, phase place closed loop control, and the inlet and exhaust valve lift, phase place of uploading motor reality are given engine management unit (1) to the double mode homogeneity compression-ignition engine of HCCI/SI (6);
Oil spout ignition control unit (5), accept ignition advance angle, fuel injection pulsewidth value that engine management unit (1) sends, finish closed loop control, and the parameters such as suction pressure, temperature of uploading motor reality are given engine management unit (1) to the double mode homogeneity compression-ignition engine of HCCI/SI (6);
Engine management unit (1), accept engine combustion information and status parameter by the CAN bus, carry out close-loop feedback control, Control Parameter after calculating is sent to other two control units by the CAN bus, finish the control of intake and exhaust phase place, lift, time of ignition and fuel injection quantity, realize quick in whole engine operation condition, accurate, the stable control of the double mode homogeneity compression-ignition engine of HCCI/SI; The engine management unit transmits the status parameter and the state of a control thereof of motor simultaneously to PC (2) simultaneously.
2, according to the double mode homogeneity compression-ignition engine control system of the described a kind of HCCI/SI of claim 1, it is characterized in that the engine management unit comprises in (1):
Load control module (8), decide the mode of operation of motor according to the actual IMEP of the rotating speed of motor, driver's (7) torque demand and combustion information collection analysis unit (3) feedback, under different combustion modes, adopt different load control strategies, and calculate the inlet and exhaust valve parameter of motor this moment;
CA50 optimizes rule module (9), according to the rotating speed and load optimization hcci engine (17) the best CA50 value at this moment of different motors;
Load parameter estimation module (10) is in order to make quick, the accurately control of combustion phase, according to motor current working state on-line optimization combustion phase Control Parameter;
Combustion phase control module (11) calculates the Control Parameter of hcci engine (17) according to different engine working modes and CA50 value;
Comprise inlet and exhaust valve lift and phase control module (15) in the full changeable air valve control unit (4); Comprise in the oil spout ignition control unit (5) that air inflow prediction and fuel injection quantity calculate (14) and air fuel ratio control module (16).
3. the double mode homogeneity compression-ignition engine control system of a kind of HCCI/SI according to claim 1 and 2, it is characterized in that it is the double mode homogeneity compression-ignition engine distributed control system of a kind of HCCI/SI based on single-chip microcomputer and CAN bus, the control task of complexity is assigned in each control unit.
4, the double mode homogeneity compression-ignition engine controlling method of a kind of HCCI/SI, it is characterized in that adopting the strategy of layering closed loop management, the double mode homogeneity compression-ignition engine control of whole HCCI/SI is divided into load control, combustion phase control and three levels of mechanism controls, and three levels all adopt corresponding closed-loop control; Load with motor is controlled to be main line, guarantees the stability of HCCI burning by the control combustion phase, optimizes the fuel economy of motor, finishes management to whole hcci engine by the control of mechanism at last.
5, according to the described a kind of double mode homogeneity compression-ignition engine controlling method of HCCI/SI that is used for of claim 3, it is characterized in that, comprise the steps:
(1) load control:
Load control module (8) in the engine management unit (1) decides the mode of operation of motor according to the actual IMEP of rotating speed, driver's (7) torque demand and combustion information collection analysis unit (3) feedback of motor, under different combustion modes, adopt different load control strategies, and calculate the inlet and exhaust valve parameter of motor this moment;
(2) combustion phase control:
IMEP and rotating speed according to motor, the optimum value of the CA50 of the best of CA50 optimization rule module (9) optimization motor, simultaneously for combustion phase control fast, stable, according to the controller parameter of the online adjustment combustion phase of load parameter estimation module (10) CA50 of motor; Finish closed loop control according to the CA50 value of the reality of combustion information collection analysis unit (3) feedback by combustion phase control module (11) to CA50;
(3) mechanism controls:
At last, parameters such as inlet and exhaust valve lift, phase place and the air fuel ratio that is calculated by load control module (8) and combustion phase control module (11), the ignition advance angle air inflow that sends to mechanism controls layer in oil spout ignition control unit (5) and the full changeable air valve control unit (4) respectively by the CAN bus is predicted and fuel injection quantity calculating (14), air fuel ratio control module (16) is finished with valve lift and phase place closed loop control module (15) waits and carry out; Finish close-loop feedback control to the double mode homogeneity compression-ignition engine of HCCI/SI.
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