CN103047036A - Natural gas engine cylinder self-checking control system and natural gas engine cylinder self-checking control method - Google Patents
Natural gas engine cylinder self-checking control system and natural gas engine cylinder self-checking control method Download PDFInfo
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- CN103047036A CN103047036A CN201110307380XA CN201110307380A CN103047036A CN 103047036 A CN103047036 A CN 103047036A CN 201110307380X A CN201110307380X A CN 201110307380XA CN 201110307380 A CN201110307380 A CN 201110307380A CN 103047036 A CN103047036 A CN 103047036A
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Abstract
The invention discloses a natural gas engine cylinder self-checking control system and a natural gas engine cylinder self-checking control method. The control system comprises an engine control unit, an engine sensor and an actuator. The engine sensor and the actuator are in communicating connection with the engine control unit. The engine sensor is used for measuring an engine rotating speed signal. The actuator is used for controlling an output drive air injection pulse width signal. The engine control unit is used for calculating angular acceleration of the rotating speed signal through circulating average, accordingly changing drive air injection pulse width of cylinder natural gas spray nozzles in a software adjusting mode and then sending the output drive air injection pulse width signal to the actuator. The actuator controls natural gas injection amount of cylinders according to the received drive air injection pulse width signal. The natural gas engine cylinder self-checking control system and the natural gas engine cylinder self-checking control method can solve the control problem caused by consistency of the spray nozzles of the natural gas engine control system, maintain stable torque outputting of a natural gas engine, have protective effect on the engine and can be applied to control of different natural gas engines.
Description
Technical field
The invention belongs to the engine electronic control system technical field, relate to a kind of motor checking control system, relate in particular to a kind of natural gas engine air cylinder self checking control system and method.
Background technique
The rock gas automatical control system is to make the gas vehicle discharging reach the most effective solution of the above emission regulation of state IV as one of core technology of natural gas engine emission controls by improving combustion and oil consumption control.Its top priority is in a disguised form to regulate the moment of torsion output of motor by each factor that the control effect Engine torque produces, and comprises the control, IGNITION CONTROL of control, mixed gas and the air fuel ratio of engine charge charge etc.
The natural gas engine control system is comprised of four parts, and wherein air supply system is by electronic throttle, and the compositions such as suction tude and intake temperature/pressure transducer are controlled and also detected air inflow; Gas supply system is comprised of gas cylinder, high-pressure solenoid valve, decompressor voltage stabilizer, blast nozzle etc., and the assurance motor is worked under the optimum excess air coefficient of MAP storage; ECU revises the emitted dose of rock gas in real time according to signals such as broad domain oxygen sensor signal, intake temperature/pressure, natural gas temperature/pressure, sends to Executive Module and realizes the combustion gas multipoint sequential injection; Ignition system is comprised of spark coil and spark plug etc., determines each cylinder time of ignition according to ignition timing MAP figure, and the control point ignition system is realized accurately igniting; ECU is the core, and the signal that collects is calculated jet amount and ignition advance angle, and electric injection system adopts closed loop control, regulates the jet amount of nozzle according to oxygen sensor signal.
In the natural gas engine control procedure, ideal situation is to drive signal when nozzle receives identical injection pulse width, thereby the gas quantity that sprays toward each cylinder is identical.Reality is that because there is consistency problem in the nozzle of each cylinder, although the injection signal that causes ECU to provide is identical, each cylinder actual ejection amount is not identical, thereby causes the workmanship output of each cylinder different, and then has influence on the stable operation of motor.
Summary of the invention
Technical problem to be solved by this invention is: a kind of natural gas engine air cylinder self checking control system is provided, is used for solving the unbalanced problem of cylinder that engine operation process runs into.
In addition, the present invention also provides a kind of natural gas engine air cylinder self checking controlling method, and the method is a closed loop control method, can dynamically solve because the problem of the motor fluctuation of service that the nozzle conformity is brought.
For solving the problems of the technologies described above, the invention provides a kind of natural gas engine air cylinder self checking control system, comprising: engine sensor, connect a motor, be used for measuring tach signal and the output of described each cylinder of motor; Control unit of engine connects described engine sensor, calculates angular acceleration by circulating after average when being used for receiving described tach signal, with the jet pulsewidth of driving of the rock gas nozzle of changing each cylinder, and generates and drives jet pulse width signal and exported; Final controlling element connects described control unit of engine, is used for controlling according to the jet pulse width signal of driving that receives the fuel gas injection amount of each cylinder.
The present invention is a kind of natural gas engine air cylinder self checking controlling method also, may further comprise the steps: step 1, and the tach signal of each cylinder in the measurement motor is then with the tach signal output that detects; Step 2 calculates angular acceleration with described tach signal, and monitors the runnability of each cylinder after circulating on average; When described angular acceleration departs from default desired value, regulate the jet pulsewidth of driving of each cylinder rock gas nozzle, and the jet pulse width signal of generation driving is exported; Step 3, the jet pulse width signal of the described driving of foundation is controlled the fuel gas injection amount of each cylinder, with rotating speed and the moment of torsion output that realizes that motor is stable.
Beneficial effect of the present invention is: natural gas engine air cylinder self checking control system of the present invention and method can solve the natural gas engine control system because the control problem that the conformity of nozzle is brought, can keep the steady torque output of natural gas engine, motor is had protective action; And can be applied in the different gas engine control.
Description of drawings
Fig. 1 is the structured flowchart of natural gas engine air cylinder self checking control system of the present invention;
Fig. 2 is the fluctuation of speed plotted curve of motor under different crank angles;
Fig. 3 is the speed curves figure after the single cylinder self checking of natural gas engine of the present invention control system is regulated;
Fig. 4 is the flow chart of natural gas engine air cylinder self checking controlling method of the present invention.
The primary clustering symbol description:
1, control unit of engine
2, engine sensor
3, final controlling element
Embodiment
The invention provides a kind of natural gas engine air cylinder self checking control system and method, this control system is monitored the lack of uniformity of each cylinder power output of motor automatically, regulate the jet pulsewidth of each cylinder rock gas nozzle by the software and hardware mode, the burning of each cylinder of motor is kept in balance unanimously, reach stable moment of torsion output.The main body of natural gas engine air cylinder self checking control system of the present invention is control unit of engine, object is the rock gas nozzle, its control software is embedded among the MCU of control unit of engine, natural gas engine and nozzle thereof for different model, the software module that facilitates, can be applied in Experimental Calibration and product stage, can detect easily each cylinder fluctuation of speed, the automatic software adjusting pulsewidth is adjusted the unbalanced of each cylinder, thereby guarantee motor stable operation, solve the difficult problem in the electrical control system for engine exploitation.
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.
Embodiment one
Present embodiment provides a kind of natural gas engine air cylinder self checking control system, and as shown in Figure 1, this self checking control system comprises control unit of engine (ECU) 1, engine sensor 2 and final controlling element 3; Described engine sensor is all communicated by letter with described control unit of engine with final controlling element and is linked to each other; Wherein control unit of engine 1 is used for the logical algorithm control of whole self checking control system, comprises processing and the output control of input signal; Described engine sensor 2 is used for measuring engine rotational speed signal; Described final controlling element 3 is used for control output and drives jet pulse width signal.
Described engine sensor 2 is speed probe.Described engine rotation speed sensor 2 comprises magnetoelectricity commonly used and Hall transducer.Described final controlling element 3 comprises the natural gas engine nozzle that various motors are commonly used.
Embodiment two
Present embodiment provides a kind of natural gas engine air cylinder self checking controlling method, and the method may further comprise the steps:
S10, engine sensor is measured engine rotational speed signal, and with the tach signal output that detects; Detailed process is: engine sensor detects the fluctuation of each cylinder (being under each corresponding crank angle) rotating speed, then the tach signal that detects is transferred to control unit of engine.
S11, control unit of engine calculates angular acceleration with described tach signal after circulating on average, further confirm the runnability of each cylinder according to angular acceleration;
S12 judges whether angular acceleration departs from default desired value;
S13 when angular acceleration departs from default desired value, namely starts the software self-adapting program, the jet pulsewidth of driving of regulating each cylinder rock gas nozzle by the software adjustment mode, and generate and drive jet pulse width signal and send to final controlling element; Otherwise return step S10; The further detailed content of this step is: motor is (non-anxious the acceleration or anxious decelerating mode) under steady state condition, the described cylinder self checking of present embodiment controlling method logic activation; Obtain each cylinder angular acceleration mean value, when certain cylinder angular acceleration deviation average 10%, namely start the software self-adapting program, adjust the gas quantity emitted dose of this cylinder by the software adjustment mode, then will drive jet pulse width signal and send to final controlling element; Herein, described default desired value is the mean value of the angular acceleration of cylinder, whether depart from default desired value namely refer to whether to depart from cylinder angular acceleration mean value 10%;
S14, final controlling element control fuel gas injection amount, the rotating speed that the realization motor is stable and the moment of torsion output of each cylinder according to the jet pulse width signal of driving that receives.
Fig. 2 is the fluctuation of speed plotted curve of motor under different crank angles;
Fig. 3 is the speed curves figure after natural gas engine air cylinder self checking control system of the present invention is regulated.
As shown in Figure 2, original engine crankshaft rotating speed presents irregular variation at some cylinder.And by after the natural gas engine air cylinder self checking controlling method adjustment of the present invention, each cylinder produces the gas pressure torque contribution of equal number, and the speed of crankshaft fluctuation is uniformly, as shown in Figure 3.
The lack of uniformity that natural gas engine air cylinder self checking control system of the present invention can at first be exported by each cylinder power of speed probe monitoring motor, then utilize ECU automatically to regulate the jet pulsewidth of driving of rock gas nozzle by software mode, the burning of each cylinder of motor is kept in balance unanimously, reach stable moment of torsion output.This is a closed loop control method, can dynamically solve because the motor operation problem that the nozzle conformity is brought.
Natural gas engine air cylinder self checking control system of the present invention and method can be applicable to dissimilar natural gas engines, be applicable to different nozzles and sensor application, the software detection flow process that facilitates, can not only be applied in engine bed and drive demarcation and car load demarcation, also can be applied in the actual automatically controlled system product.
The invention has the beneficial effects as follows:
1, the present invention can solve the natural gas engine control system because the control problem that the consistency problem of nozzle brings;
2, the present invention can keep the steady torque output of natural gas engine, and motor is played a protective role;
3, the present invention has good transplantability, can be applied in the different gas engine control.
Description of the invention and application are illustrative, are not to want with scope restriction of the present invention in the above-described embodiments.Here disclosed embodiment's distortion and change is possible, and the various parts of embodiment's replacement and equivalence are known for those those of ordinary skill in the art.Those skilled in the art are noted that in the situation that does not break away from spirit of the present invention or substantive characteristics, and the present invention can be with other forms, structure, layout, ratio, and realize with other elements, material and parts.In the situation that does not break away from the scope of the invention and spirit, can carry out other distortion and change to disclosed embodiment here.
Claims (8)
1. a natural gas engine air cylinder self checking control system is characterized in that, comprising:
Engine sensor connects a motor, is used for measuring tach signal and the output of described each cylinder of motor;
Control unit of engine connects described engine sensor, calculates angular acceleration by circulating after average when being used for receiving described tach signal, with the jet pulsewidth of driving of the rock gas nozzle of changing each cylinder, and generates and drives jet pulse width signal and exported;
Final controlling element connects described control unit of engine, is used for controlling according to the jet pulse width signal of driving that receives the fuel gas injection amount of each cylinder.
2. natural gas engine air cylinder self checking control system according to claim 1, it is characterized in that: described engine sensor is speed probe.
3. natural gas engine air cylinder self checking control system according to claim 2, it is characterized in that: described speed probe is magnetoelectric transducer or Hall transducer.
4. natural gas engine air cylinder self checking control system according to claim 1, it is characterized in that: described final controlling element is the natural gas engine nozzle.
5. a natural gas engine air cylinder self checking controlling method is characterized in that, may further comprise the steps:
Step 1, the tach signal of each cylinder in the measurement motor is then with the tach signal output that detects;
Step 2 calculates angular acceleration with described tach signal, and monitors the runnability of each cylinder after circulating on average; When described angular acceleration departs from default desired value, regulate the jet pulsewidth of driving of each cylinder rock gas nozzle, and the jet pulse width signal of generation driving is exported;
Step 3, the jet pulse width signal of the described driving of foundation is controlled the fuel gas injection amount of each cylinder, with rotating speed and the moment of torsion output that realizes that motor is stable.
6. natural gas engine air cylinder self checking controlling method according to claim 5 is characterized in that: also comprise the step for a default desired value.
7. natural gas engine air cylinder self checking controlling method according to claim 6, it is characterized in that: described speed probe is magnetoelectric transducer or Hall transducer.
8. natural gas engine air cylinder self checking controlling method according to claim 5, it is characterized in that: described final controlling element is the natural gas engine nozzle.
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| JP2001355500A (en) * | 2000-06-15 | 2001-12-26 | Denso Corp | Fuel injection device for multicylinder engine |
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| JP2004204696A (en) * | 2002-12-24 | 2004-07-22 | Nikki Co Ltd | Positive pressure gas fuel supply method for engine |
| CN1763358A (en) * | 2004-10-20 | 2006-04-26 | 北京交通大学 | Electrically controlled multi-point sequential injection system and control method for natural gas engine |
| CN1884809A (en) * | 2005-06-22 | 2006-12-27 | 株式会社电装 | Fuel injection controlling apparatus for internal combustion engine |
| CN101424224A (en) * | 2008-11-20 | 2009-05-06 | 张和君 | Electric-controlled natural gas engine operating system and control method thereof |
| CN102052173A (en) * | 2009-10-30 | 2011-05-11 | 日立汽车系统株式会社 | Control apparatus for engine |
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- 2011-10-12 CN CN201110307380XA patent/CN103047036A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001355500A (en) * | 2000-06-15 | 2001-12-26 | Denso Corp | Fuel injection device for multicylinder engine |
| CN1469037A (en) * | 2002-06-20 | 2004-01-21 | 株式会社电装 | Fuel injecting quantity control system for engine |
| JP2004204696A (en) * | 2002-12-24 | 2004-07-22 | Nikki Co Ltd | Positive pressure gas fuel supply method for engine |
| CN1763358A (en) * | 2004-10-20 | 2006-04-26 | 北京交通大学 | Electrically controlled multi-point sequential injection system and control method for natural gas engine |
| CN1884809A (en) * | 2005-06-22 | 2006-12-27 | 株式会社电装 | Fuel injection controlling apparatus for internal combustion engine |
| CN101424224A (en) * | 2008-11-20 | 2009-05-06 | 张和君 | Electric-controlled natural gas engine operating system and control method thereof |
| CN102052173A (en) * | 2009-10-30 | 2011-05-11 | 日立汽车系统株式会社 | Control apparatus for engine |
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Application publication date: 20130417 |