CN201884138U

CN201884138U - Vehicular fuel gas sequential spraying system with OBD (On-Board Diagnostics) system

Info

Publication number: CN201884138U
Application number: CN2010206644673U
Authority: CN
Inventors: 王明涛
Original assignee: HENAN OUYI ENVIRONMENTAL PROTECTION TECHNOLOGY Co Ltd
Current assignee: HENAN OUYI ENVIRONMENTAL PROTECTION TECHNOLOGY Co Ltd
Priority date: 2010-12-17
Filing date: 2010-12-17
Publication date: 2011-06-29
Anticipated expiration: 2020-12-17

Abstract

The utility model relates to a vehicular fuel gas sequential spraying system with an OBD (On-Board Diagnostics) system, comprising a fuel gas supply system. The fuel gas supply system consists of a gas storage steel bottle and a high-voltage electromagnetic valve that are connected with each other; a pressure sensor is arranged on the high-voltage electromagnetic valve; the high-voltage electromagnetic valve is connected with a manual cut-off valve by a steel pipe and is connected with a pressure reducer by a steel pipe; the pressure reducer is connected with one end of a gas filter by a rubber hose; the other end of the gas filter is connected with a gas spraying valve by a rubber hose; a nozzle of the gas spraying valve is connected with a corresponding engine cylinder by a rubber hose; the gas storage steel bottle is provided with a steel bottle corner valve; an inflation valve is arranged on a gas outlet pipe of the gas storage steel bottle; and an electric control system consists of a water temperature sensor arranged on the pressure reducer, a gas temperature sensor arranged on the gas spraying valve, a conversion switch, a buzzer, a manifold pressure sensor, a fuel gas pressure sensor, an oxygen sensor, an engine rotating speed sensor, an OBD adapter and a fuel gas ECU (electric control unit). The vehicular fuel gas multi-point sequential spraying system with the OBD system can ensure that the best air-fuel ratio of an engine and the best driving performance of an automobile under various working conditions, and the economy of the system can be improved by more than 10% compared with a normal vehicular fuel gas system.

Description

A kind of vehicle fuel sequencial jet system with OBD system

One, technical field

The utility model relates to the vehicle fuel ejecting system, particularly combustion gas is accurately sprayed the vehicle fuel sequencial jet system of a kind of OBD of the having system of control.

Two, background technique

Along with the development of global communications, various countries are to the motor vehicle exhaust emission pay attention to day by day.On June 24th, 2008, Environmental Protection Department issue " automobile-used compression-ignited, gaseous fuel spark-ignition engine require " with automobile mounted diagnosis (OBD) systems technology, and announce that this requirement was from enforcement on July 1 in 2008.Existing gas engine electric-controlled multipoint sequencial jet system and controlling method can not adapt to this requirement at present, existing gas burning system has only the rough control to the combustion gas pulsewidth, can not accept the monitoring of former car OBD and the combustion gas pulsewidth is carried out short-term correction and long-term the correction, thereby can not satisfy existing state 3 or state's 4 emission requests, the OBD trouble light is lighted when causing combustion gas.Therefore, how addressing the above problem, has been the problem that those skilled in the art were concerned about.

Three, summary of the invention

At above-mentioned situation, for overcoming the defective of prior art, the utility model purpose just provides a kind of vehicle fuel sequencial jet system of the OBD of having function.The technological scheme that the utility model solves is: connect combustion gas ECU and former car ECU by the gas combustion automobile OBD ABAP Adapter with multiple kinds, OBD uses the advanced numeric string vocal imitation skill based on the CAN bus, according to diagnosing former car ECU to the fuel injection pulsewidth under the different operating modes, combustion gas ECU carries out accurate in real time short-term and long-term revise by software to the combustion gas pulsewidth according to the fuel injection pulsewidth of former car ECU and the corrected signal of OBD transmission, makes vehicle identical with fuel performance at the process medium power of combustion gas.The regulation that meets simultaneously " automobile-used compression-ignited, gaseous fuel spark-ignition engine require " fully with automobile mounted diagnosis (OBD) systems technology, and native system can with OBD diagnostic system (OBDII and the EOBD) compatibility that has all vehicles now.In view of the above, the utility model structure is, comprise gas supply system and electric controller system, wherein gas supply system is by the atmosphere storage steel cylinder, gas charging valve, cylinder angle valve, pressure transducer, high-pressure solenoid valve, hand stop valve, decompressor, pneumatic filter, gas spray valve and cylinder constitute, the atmosphere storage steel cylinder is connected with high-pressure solenoid valve, and pressure transducer is installed on the high-pressure solenoid valve, and high-pressure solenoid valve is connected to hand stop valve by steel pipe, and then be connected to decompressor by steel pipe, decompressor is connected by rubber hose with pneumatic filter one end, by rubber hose the pneumatic filter the other end is connected with gas spray valve again, and the nozzle of gas spray valve is connected by rubber hose with corresponding cylinder, on the atmosphere storage steel cylinder cylinder angle valve is arranged, on the steam outlet pipe of atmosphere storage steel cylinder gas charging valve is arranged; Automatical control system is by the cooling-water temperature sensor that is installed on the decompressor, is installed in the gas temperature sensor on the gas spray valve, throw over switch, buzzer, menifold pressure transducer, gaseous-pressure sensor, lambda sensor, engine rotation speed sensor, OBD ABAP Adapter and combustion gas ECU constitute.Gas pressure sensor is contained on the pipeline between hand stop valve and the decompressor, former car ECU, solenoid valve, gas pressure sensor, manifold pressure sensor, cooling-water temperature sensor, gas temperature sensor, throw over switch, lambda sensor, engine rotation speed sensor, gas combustion automobile OBD ABAP Adapter, buzzer are connected with combustion gas ECU respectively, former car ECU, solenoid valve, gas pressure sensor, cooling-water temperature sensor, gas temperature sensor, throw over switch, gas combustion automobile OBD, buzzer are connected with combustion gas ECU respectively, constitute ECU (Electrical Control Unit); Thereby combustion gas ECU is by accurately controlling the combustion gas pulsewidth the sensor Signal Processing and according to the OBD signal combustion gas pulsewidth being carried out short-term and satisfy emission request with long-term the correction.

The utility model is the combustion gas multipoint sequential injection control system with OBD function, except from former car ECU gathers signal, also the combustion gas pulsewidth is carried out short-term and long-term the correction by the OBD feedback, guarantee the optimal air-fuel ratio of motor under various operating modes and the best driveability energy of automobile, make the exhaust emissions of vehicle meet exhaust emission standard fully, and power performance is identical with use gasoline performance, and Economy improves more than 10% than traditional vehicle fuel system, and economic and social benefit is huge.

Four, description of drawings

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is the combustion gas ECU circuit theory diagrams in the utility model.

Five, embodiment

Below in conjunction with accompanying drawing embodiment of the present utility model is elaborated.

Provide by Fig. 1 Fig. 2, the utility model comprises gas supply system and electric controller system, wherein gas supply system is by atmosphere storage steel cylinder 3, gas charging valve 1, cylinder angle valve 2, pressure gauge 4, high-pressure solenoid valve 5, hand stop valve 6, decompressor 8, pneumatic filter 10, gas spray valve 11 and cylinder 12 constitute, and atmosphere storage steel cylinder 3 is connected with high-pressure solenoid valve 5, pressure gauge 4 is installed on the high-pressure solenoid valve 5, high-pressure solenoid valve 5 connects decompressor 8 through manual stop valve 6, and decompressor 8 is connected with pneumatic filter 10, pneumatic filter 10 is connected on the gas spray valve 11, the nozzle of gas spray valve is connected with corresponding cylinder 12, and cylinder angle valve 2 is arranged on the atmosphere storage steel cylinder 3, and gas charging valve 1 is arranged on the steam outlet pipe of atmosphere storage steel cylinder 3; The electric controller system is by cooling-water temperature sensor 7, gas pressure sensor 9, gas temperature sensor 13, throw over switch 18, buzzer 17, manifold pressure sensor 14, former car ECU 16, gas combustion automobile OBD ABAP Adapter 19, lambda sensor 20, engine rotation speed sensor 21 and combustion gas ECU15 constitute, gas pressure sensor 9 is contained on the pipeline between hand stop valve 6 and the decompressor 8, former car ECU 16, solenoid valve 5, gas pressure sensor 9, cooling-water temperature sensor 7, gas temperature sensor 13, throw over switch 18, lambda sensor 20, engine rotation speed sensor 21, gas combustion automobile OBD ABAP Adapter 19, buzzer 17 is connected with combustion gas ECU15 respectively, constitutes ECU (Electrical Control Unit), combustion gas ECU15 controls the combustion gas pulsewidth accurately by judging above-mentioned each ECU (Electrical Control Unit) signal.

In order to guarantee using effect, described gas combustion automobile OBD ABAP Adapter 19 has the advanced numeric string vocal imitation skill based on the CAN bus, and has multiple kinds, can install and use with all vehicles on the market, native system is connected with combustion gas ECU 15 and former car ECU 16 by gas combustion automobile OBD ABAP Adapter 19, state of a control according to 16 pairs of fuel injection signals of the former car ECU of diagnosis, combustion gas ECU accurately controls required combustion gas tolerance by software, make the exhaust emissions of automobile meet exhaust emission standard, get rid of the fault that the mismatch problem owing to gas burning system and oil-fired system causes;

The combustion gas ECU of native system links to each other with former car ECU, gathers cooling-water temperature sensor, gas temperature sensor, throw over switch, buzzer, menifold pressure transducer, gaseous-pressure sensor, lambda sensor, engine rotation speed sensor, signals such as OBD ABAP Adapter carry out independent, real-time calculating to the injection pulse width of each nozzle of gas spray valve, accurately the injection pulse width of control gaseous injection valve makes the efficient of automobile in the process of burning gas reach consistent with power and oil firing;

The combustion gas ECU of the utility model system has integrated digital serial ports, can communicate with PC easily by datawire, by PC demarcate intuitively, easily motor under various operating modes air fuel ratio and the combustion gas pulsewidth to reach optimum performance.

Described combustion gas ECU 15 is made of housing and interior control circuit thereof, described control circuit is provided by Fig. 2, comprise input circlult, arithmetic processing circuit and output control circuit, wherein input circlult is mainly to manifold pressure sensor, speed probe, intake air temperature sensor, signal that cooling-water temperature sensor etc. provide and control signal are carried out filtering, amplify and processing, signal is through amplifying, give ECU after the denoising and carry out calculation process, native system is selected for use at a high speed, stable control chip, by repeatedly filtering, operations such as isolation, guaranteed that controller chip is stable, characteristics such as antijamming capability is strong, native system combustion gas ECU is by the COMPREHENSIVE CALCULATING to various signals, handle, controlling peripheral performance element carries out according to expection, promptly injection valve 11 jet pulsewidths and jet amount are accurately controlled by output IJBT circuit, guarantee automobile in gas process with the conformity of fuel performance, make automobile in the process of moving at a high speed, stable.In view of the above, this control circuit concrete structure is, between 23 pin of single-chip microcomputer U1 (ATmega64), 24 pin crystal oscillator Y1 is housed, and through capacitor C 17, C18 ground connection, constitutes clock circuit, and U1 provides time reference for single-chip microcomputer; 21 pin of single-chip microcomputer U1 (ATmega64), 52 pin, 64 pin

meet power supply

5V, 20 pin, 53 pin, 63 pin ground connection, the power circuit of formation single-chip microcomputer; The 57 pin connecting resistance R2 of single-chip microcomputer U1 (ATmega64), capacitor C 2, resistance R 2 connects capacitor C 1 and gas combustion automobile OBD ABAP Adapter through resistance R 1, capacitor C 1, C2 ground connection, capacitor C 1, C2, resistance R 1, R2 constitute the first secondary low-pass filter circuit; The 58 pin connecting resistance R4 of single-chip microcomputer U1, capacitor C 4, resistance R 4 connects capacitor C 3 and gas pressure sensor through resistance R 3, capacitor C 3, C4 ground connection, capacitor C 3, C4, resistance R 3, R4 constitute the second secondary low-pass filter circuit; The 60 pin connecting resistance R6 of single-chip microcomputer U1 (ATmega64), capacitor C 6, resistance R 6 connects capacitor C 5 and manifold pressure sensor through resistance R 5, capacitor C 5, C6 ground connection, capacitor C 5, C6, resistance R 5, R6 constitute the 3rd secondary low-pass filter circuit; These three groups of secondary low-pass filter circuits have been guaranteed OBD ABAP Adapter signal, the accuracy of gas pressure signal after entering combustion gas ECU control chip, have strengthened its antijamming capability; 56 pin connecting resistance R7, R8 and the capacitor C 7 of single-chip microcomputer U1 (ATmega64), resistance R 7 meets power supply 12V, capacitor C 7, resistance R 8 ground connection, resistance R 7, R8 and C7 constitute limiting filter circuit, and whether responsible detection system starts; 54 pin connecting resistance R10 and the capacitor C 8 of single-chip microcomputer U1 (ATmega64), and through resistance R 10, connecting resistance R9, R11, resistance R 9 meets power supply 5V, resistance R 11 connects capacitor C 9 and gas temperature sensor, capacitor C 8, C9 ground connection, capacitor C 8, C9 and resistance R 9, R10, R11 constitute first with on the secondary eliminator that draws; 61 pin of single-chip microcomputer U1 (ATmega64) connect capacitor C 11, resistance R 14, and through resistance R 14 connecting resistance R12, R13, resistance R 13 meets power supply 5V, resistance R 12 connects capacitor C 10 and cooling-water temperature sensor, capacitor C 10, C11 ground connection, capacitor C 10, C11 and resistance R 12, R13, R14 constitute second with on the secondary eliminator that draws, because cooling-water temperature sensor and gas temperature sensor all are resistance type sensors, by the secondary eliminator that draws on these two groups of bands, guaranteed that temperature signal has accurately the advantage that antijamming capability is strong; The 48 pin connecting resistance R15 capacitor C 13 of single-chip microcomputer U1, and connect collector electrode and the resistance R 16 of triode Q1 through resistance R 5, resistance R 16, capacitor C 13 ground connection, the emitter of triode Q1 meets power supply 5V, the base stage of triode Q1 meets diode D2, capacitor C 14, resistance R 17, diode D2, capacitor C 14 ground connection, resistance R 17 contacts fire switch, resistance R 15, R16, R17 capacitor C 13, C14 triode Q1 and diode D2 have constituted the switching circuit of ignition switch, combustion gas ECU is by the high-low level of 48 pin of detection single-chip microcomputer U1, judge the state of automobile, thereby reach the process of automobile starting igniting; 2 pin of single-chip microcomputer U1 connect diode first capacitor C 12, resistance R 18, and connect the serial ports reception through resistance R 18, capacitor C 12, diode first ground connection, and resistance R 18 capacitor C 12 and diode D1 constitute voltage clamping circuit; 3 pin of single-chip microcomputer U1 connect diode D3, capacitor C 15, resistance R 19, and connect serial ports through resistance R 19 and send, capacitor C 15, diode D3 ground connection, resistance R 19, capacitor C 15 and diode D3 constitute the clamped circuit of low voltage, these two groups of voltage clamping circuits are respectively the transmission and the receiving circuits of (main control chip) digital serial ports of combustion gas ECU single-chip microcomputer U1 (ATmega64), sort circuit avoided combustion gas ECU by datawire and PERCOM peripheral communication the time overtension to the influence of ECU; 16 pin of single-chip microcomputer U1 (ATmega64) connect 1 pin of integrated operational amplifier U2A, the 2 pin connecting resistance R25 of integrated operational amplifier U2A, R26, resistance R 25 ground connection, resistance R 26 meets

power supply

5V, 3 pin connecting resistance R27 of integrated operational amplifier, R28 and ground capacity C16, resistance R 27 meets power supply 5V, resistance R 28 meets former car ECU, resistance R 25, R26, R27, R28 capacitor C 16 and integrated operational amplifier constitute voltage comparator, by gathering the fuel injection signal of former car ECU, after carrying out Signal Processing, be converted into single-chip microcomputer U1 (ATmega64) acceptable TTL signal, be transferred to 16 pin, thereby gather the fuel oil signal of former car ECU under different operating modes, combustion gas ECU by with the contrast of fuel oil, by the rectangular wave of the 42 pin output certain frequency of single-chip microcomputer U1 by resistance R 20 current limlitings after control IJBT pipe Q2 conducting with close, thereby make gas spray valve can export the injection signal of expectation, accurately the quantity of control gaseous injection valve combustible gas injected; 42 pin of single-chip microcomputer U1 connect IJBT pipe Q2 base stage through resistance R 20, transmitter ground connection and the resistance R 21 of IJBT pipe Q2, collector electrode connecting resistance R21 diode D4 and the gas spray valve of IJBT pipe Q2, diode D4 connecting resistance R22, metal-oxide-semiconductor Q3, resistance R 22 connects metal-oxide-semiconductor Q3 and resistance R 23, metal-oxide-semiconductor Q3 meets power supply 12V, resistance R 23 connects the collector electrode of triode Q4, triode Q4 grounded-emitter connection, the base stage of triode Q4 connects 33 pin of single-chip microcomputer U1 through resistance R 24, resistance R 21, R22, R23, R24 diode D4 triode Q4 and metal-oxide-semiconductor Q3 constitute the protective circuit of high pulse voltage signal, thereby injection valve can be worked for a long time, and unlikely damage; 17 pin connecting resistance R29, the R30 of single-chip microcomputer U1 (ATmega64), resistance R 29 connects the grounded-emitter connection of triode Q8, resistance R 30 connects triode Q8 base stage, the collector connecting relay J2 of triode Q8, and the relay J 1 through connecting meets power supply 12V, resistance R 29, R30 and triode Q8 form switching circuit, the conducting of control relay J1, J2, thereby the opening and closing of control electromagnetic valve; 28 pin of single-chip microcomputer U1 (ATmega64) meet base stage and the ground capacity C19 of triode Q6, the grounded-emitter connection of triode Q6, the base stage of the collector connecting transistor Q7 of triode Q6, the emitter of triode Q7 meets power supply 12V, the collector electrode of triode Q7 meets conversion switch and earth resistance R31, single-chip microcomputer U1 (ATmega64) thus 28 pin by the conducting of output height Transistor-Transistor Logic level control Q6 and conducting and the shutoff that Q7 has been controlled in shutoff, make the throw over switch signaling line export corresponding high-low signal, capacitor C 19 has guaranteed the flatness of output signal, strengthens antijamming capability; 32 pin of single-chip microcomputer U1 (ATmega64) connect the base stage of triode Q5, the collector electrode of triode Q5 meets power supply 5V, the emitter of triode Q5 connects buzzer, 32 pin of single-chip microcomputer U1 (ATmega64) are by control triode Q5, make buzzer can send different alarm sounds, the combustion gas ECU of native system is by to after the judgement of input signal, the calculation process, and the performance element of control native system is finished corresponding action.

The combustion gas ECU of this system 15 can be connected communication with PC easily by dedicated data line, regulate the motor jet time in the process of moving and the major parameter of the motors such as proportions of ingredients of inflammable gas intuitively, easily by PC, install simple, debugging is convenient, accurately, automobile reaches at a high speed in the process of moving, stable purpose thereby make.

The working condition of the utility model system is, at first open storage steel bottle hand stop valve 6, open automobile ignition switch, motor 12 starts with the fuel oil state, when motor operation a period of time cooling water temperature reaches the combustion gas reverse temperature of combustion gas ECU 15 settings, be transformed into the combustion gas state by throw over switch 18, combustion gas ECU 15 sends control signal and opens high-pressure solenoid valve 5, make pressurized gas be transported to decompressor 8 by the steel pipe hand control valve of flowing through, enter pneumatic filter 10 after by decompressor 8 pressurized gas being kept to the low-pressure gas that is fit to engine operation, relatively pure low-pressure fuel gas enters in the gas spray valve 11 after being filtered, combustion gas ECU 15 gathers cooling-water temperature sensor 7, gas pressure sensor 9, gas temperature sensor 13, the engine coolant temperature signal that manifold pressure sensor 14 and gas combustion automobile OBD ABAP Adapter 19 are passed back, the gas pressure signal of gas spray valve 11, gas temperature signal, engine rotational speed signal, signal specific such as supply voltage and OBD adaptation data, by these signals are carried out calculation process, calculate the fuel gas injection time, thereby accurately control each nozzle sequence-injection time of injection valve, thereby make automobile when combustion gas during with fuel oil under various driving cycles motor operation conditions consistent, thereby automobile is had steadily in the process of moving, at a high speed, advantages such as power character is strong.

Claims

1. vehicle fuel sequencial jet system with OBD system, comprise blast tube system and electric controller system, it is characterized in that, described blast tube system is by atmosphere storage steel cylinder (3), gas charging valve (1), cylinder angle valve (2), pressure gauge (4), high-pressure solenoid valve (5), hand stop valve (6), decompressor (8), pneumatic filter (10), gas spray valve (11) and cylinder (12) constitute, atmosphere storage steel cylinder (3) is connected with high-pressure solenoid valve (5), pressure gauge (4) is installed on the high-pressure solenoid valve (5), and high-pressure solenoid valve (5) connects decompressor (8) through manual stop valve (6), and decompressor (8) is connected with pneumatic filter (10), pneumatic filter (10) connects gas spray valve (11), the nozzle of gas spray valve is connected with corresponding cylinder (12), and cylinder angle valve (2) is arranged on the atmosphere storage steel cylinder (3), and gas charging valve (1) is arranged on the steam outlet pipe of atmosphere storage steel cylinder (3); Described electric controller system is by cooling-water temperature sensor (7), gas pressure sensor (9), gas temperature sensor (13), throw over switch (18), buzzer (17), manifold pressure sensor (14), former car ECU (16), gas combustion automobile OBD ABAP Adapter (19), lambda sensor (20), engine rotation speed sensor (21) and combustion gas ECU (15) constitute, gas pressure sensor (9) is contained on the pipeline between hand stop valve (6) and the decompressor (8), former car ECU (16), high-pressure solenoid valve (5), gas pressure sensor (9), cooling-water temperature sensor (7), gas temperature sensor (13), throw over switch (18), lambda sensor (20), engine rotation speed sensor (21), gas combustion automobile OBD ABAP Adapter (19), buzzer (17) is connected with combustion gas ECU (15) respectively, constitutes ECU (Electrical Control Unit), combustion gas ECU (15) controls the combustion gas pulsewidth accurately by judging above-mentioned each ECU (Electrical Control Unit) signal.

2. the vehicle fuel sequencial jet system with OBD system according to claim 1, it is characterized in that, described gas combustion automobile OBD ABAP Adapter (19) has the advanced digital serial ports based on the CAN bus, and has communications protocol, can install and use with all vehicles on the market, be connected with combustion gas ECU (15) and former car ECU (16) by gas combustion automobile OBD ABAP Adapter (19), diagnose the state of a control of former car ECU (16) to fuel injection signal, combustion gas ECU (15) accurately controls required combustion gas tolerance by software, make the exhaust emissions of automobile meet exhaust emission standard, get rid of the fault that the mismatch problem owing to gas burning system and oil-fired system causes.

3. the vehicle fuel sequencial jet system with OBD system according to claim 1, it is characterized in that, described combustion gas ECU (15) links to each other with former car ECU (16), gather cooling-water temperature sensor (7), gas temperature sensor (13), throw over switch (18), buzzer (17), menifold pressure transducer (14), gas pressure sensor (9), lambda sensor (20), engine rotation speed sensor (21), the signal of OBD ABAP Adapter (19) carries out separately the injection pulse width of each nozzle of gas spray valve (11), real-time calculating, accurately the injection pulse width of control gaseous injection valve (11) makes the efficient of automobile in the process of burning gas reach consistent with power and oil firing.

4. the vehicle fuel sequencial jet system with OBD system according to claim 1, it is characterized in that, described combustion gas ECU (15) has integrated digital serial ports, communicate by datawire and PC, regulate major parameters such as in the process of moving engine speed of various sensors, nozzle and motor, fuel injection time, fueling injection pressure intuitively by PC, automobile reaches at a high speed in the process of moving, stable performance thereby make.

5. the vehicle fuel sequencial jet system with OBD system according to claim 1, it is characterized in that, described combustion gas ECU (15) is made of housing and interior control circuit thereof, described control circuit structure is, crystal oscillator Y1 is housed and through capacitor C 17, C18 ground connection between 23 pin of single-chip microcomputer U1,24 pin, constitute clock circuit, U1 provides time reference for single-chip microcomputer; 21 pin of single-chip microcomputer U1,52 pin, 64 pin meet power supply 5V, 20 pin, 53 pin, 63 pin ground connection, the power circuit of formation single-chip microcomputer; The 57 pin connecting resistance R2 of single-chip microcomputer U1, capacitor C 2, resistance R 2 connects capacitor C 1 and gas combustion automobile OBD ABAP Adapter through resistance R 1, capacitor C 1, C2 ground connection, capacitor C 1, C2, resistance R 1, R2 constitute the first secondary low-pass filter circuit; The 58 pin connecting resistance R4 of single-chip microcomputer U1, capacitor C 4, resistance R 4 connects capacitor C 3 and gas pressure sensor through resistance R 3, capacitor C 3, C4 ground connection, capacitor C 3, C4, resistance R 3, R4 constitute the second secondary low-pass filter circuit; The 60 pin connecting resistance R6 of single-chip microcomputer U1, capacitor C 6, resistance R 6 connects capacitor C 5 and vacuum transducer through resistance R 5, capacitor C 5, C6 ground connection, capacitor C 5, C6, resistance R 5, R6 constitute the 3rd secondary low-pass filter circuit; These three groups of secondary low-pass filter circuits have guaranteed that OBD ABAP Adapter signal, gas pressure signal, vacuum signal are accurate after entering combustion gas ECU control chip, antijamming capability is strong; 56 pin connecting resistance R7, R8 and the capacitor C 7 of single-chip microcomputer U1, resistance R 7 meets power supply 12V, capacitor C 7, resistance R 8 ground connection, resistance R 7, R8 and C7 constitute limiting filter circuit, and whether responsible detection system starts; 54 pin connecting resistance R10 and the capacitor C 8 of single-chip microcomputer U1, and through resistance R 10, connecting resistance R9, R11, resistance R 9 meets power supply 5V, resistance R 11 connects capacitor C 9 and gas temperature sensor, capacitor C 8, C9 ground connection, capacitor C 8, C9 and resistance R 9, R10, R11 constitute first with on the secondary eliminator that draws; 61 pin of single-chip microcomputer U1 connect capacitor C 11, resistance R 14, and through resistance R 14 connecting resistance R12, R13, resistance R 13 meets power supply 5V, resistance R 12 connects capacitor C 10 and cooling-water temperature sensor, capacitor C 10, C11 ground connection, capacitor C 10, C11 and resistance R 12, R13, R14 constitute second with on the secondary eliminator that draws, because decompressor cooling-water temperature sensor and gas temperature sensor all are resistance type sensors, by the secondary eliminator that draws on these two groups of bands, guaranteed that temperature signal has accurately the advantage that antijamming capability is strong; The 48 pin connecting resistance R15 capacitor C 13 of single-chip microcomputer U1, and connect collector electrode and the resistance R 16 of triode Q1 through resistance R 5, resistance R 16, capacitor C 13 ground connection, the emitter of triode Q1 meets power supply 5V, the base stage of triode Q1 meets diode D2, capacitor C 14, resistance R 17, diode D2, capacitor C 14 ground connection, resistance R 17 contacts fire switch, resistance R 15, R16, R17 capacitor C 13, C14 triode Q1 and diode D2 have constituted the switching circuit of ignition switch, combustion gas ECU is by the high-low level of 48 pin of single-chip microcomputer U1, judge the state of automobile, thereby reach the process of automobile starting igniting; 2 pin of single-chip microcomputer U1 connect diode first capacitor C 12, resistance R 18, and connect the serial ports reception through resistance R 18, capacitor C 12, diode first ground connection, and resistance R 18 capacitor C 12 and diode D1 constitute voltage clamping circuit; 3 pin of single-chip microcomputer U1 connect diode D3, capacitor C 15, resistance R 19, and connect serial ports through resistance R 19 and send, capacitor C 15, diode D3 ground connection, resistance R 19, capacitor C 15 and diode D3 constitute the clamped circuit of low voltage, these two groups of voltage clamping circuits are respectively the transmission and the receiving circuits of the digital serial ports of combustion gas ECU single-chip microcomputer U1, sort circuit avoided combustion gas ECU by datawire and PERCOM peripheral communication the time overtension to the influence of ECU; 16 pin of single-chip microcomputer U1 connect 1 pin of integrated operational amplifier U2A, the 2 pin connecting resistance R25 of integrated operational amplifier U2A, R26, resistance R 25 ground connection, resistance R 26 meets power supply 5V, 3 pin connecting resistance R27 of integrated operational amplifier, R28 and ground capacity C16, resistance R 27 meets power supply 5V, resistance R 28 meets former car ECU, resistance R 25, R26, R27, R28 capacitor C 16 and integrated operational amplifier constitute voltage comparator, by gathering the fuel injection signal of former car ECU, after carrying out Signal Processing, be converted into single-chip microcomputer U1 acceptable TTL signal, be transferred to 16 pin, thereby gather the fuel oil signal of former car ECU under different operating modes, combustion gas ECU by with the contrast of fuel oil, by the rectangular wave of the 42 pin output certain frequency of single-chip microcomputer U1 by resistance R 20 current limlitings after control IJBT pipe Q2 conducting with close, thereby make gas spray valve can export the injection signal of expectation, accurately the quantity of control gaseous injection valve combustible gas injected; 42 pin of single-chip microcomputer U1 connect IJBT pipe Q2 base stage through resistance R 20, transmitter ground connection and the resistance R 21 of IJBT pipe Q2, collector electrode connecting resistance R21 diode D4 and the gas spray valve of IJBT pipe Q2, diode D4 connecting resistance R22, metal-oxide-semiconductor Q3, resistance R 22 connects metal-oxide-semiconductor Q3 and resistance R 23, metal-oxide-semiconductor Q3 meets power supply 12V, resistance R 23 connects the collector electrode of triode Q4, triode Q4 grounded-emitter connection, the base stage of triode Q4 connects 33 pin of single-chip microcomputer U1 through resistance R 24, resistance R 21, R22, R23, R24 diode D4 triode Q4 and metal-oxide-semiconductor Q3 constitute the protective circuit of high pulse voltage signal, thereby injection valve can be worked for a long time, and unlikely damage; 17 pin connecting resistance R29, the R30 of single-chip microcomputer U1, resistance R 29 connects the grounded-emitter connection of triode Q8, resistance R 30 connects triode Q8 base stage, the collector connecting relay J2 of triode Q8, and the relay J 1 through connecting meets power supply 12V, resistance R 29, R30 and triode Q8 form switching circuit, the conducting of control relay J1, J2, thereby the opening and closing of control electromagnetic valve; 28 pin of single-chip microcomputer U1 meet base stage and the ground capacity C19 of triode Q6, the grounded-emitter connection of triode Q6, the base stage of the collector connecting transistor Q7 of triode Q6, the emitter of triode Q7 meets power supply 12V, the collector electrode of triode Q7 meets conversion switch and earth resistance R31, thereby 28 pin of single-chip microcomputer U1 are by the conducting of output height Transistor-Transistor Logic level control Q6 and conducting and the shutoff that Q7 has been controlled in shutoff, make the throw over switch signaling line export corresponding high-low signal, capacitor C 19 has guaranteed the flatness of output signal, strengthens antijamming capability; 32 pin of single-chip microcomputer U1 connect the base stage of triode Q5, the collector electrode of triode Q5 meets power supply 5V, the emitter of triode Q5 connects buzzer, 32 pin of single-chip microcomputer U1 are by control triode Q5, make buzzer can send different alarm sounds, combustion gas ECU is by to after the judgement of input signal, the calculation process, and the performance element of control native system is finished corresponding action.