CN104088711A - Electrical control management unit for engine fuel gas - Google Patents
Electrical control management unit for engine fuel gas Download PDFInfo
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- CN104088711A CN104088711A CN201410259391.9A CN201410259391A CN104088711A CN 104088711 A CN104088711 A CN 104088711A CN 201410259391 A CN201410259391 A CN 201410259391A CN 104088711 A CN104088711 A CN 104088711A
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Abstract
The invention discloses an electrical control management unit for engine fuel gas. The electrical control management unit comprises a main control unit as well as an ignition drive and ignition feedback circuit, an oil injection drive and fault diagnosis circuit, a low side drive and fault diagnosis circuit, a step motor drive and fault diagnosis circuit, an oxygen sensor heating and fault diagnosis circuit, an analog input signal processing unit, a switch value input signal processing unit, a data storage unit, a knock signal processing unit, a frequency signal processing circuit, a power supply and reset management unit and a communication unit which are connected with the main control unit respectively. According to the electrical control management unit, crankshaft signal processing circuits in the power supply and reset management unit, the communication unit and the frequency signal input unit are changed to integrated combination from discrete chips; not only are three discrete circuit units reduced, but also the consumption of integrated chips is remarkably reduced, so that the purpose of reducing the cost is achieved; meanwhile, an oxygen sensor heating drive circuit controlled by the integrated chips is changed to be built by discrete devices to improve the heating drive capability.
Description
Technical field
The present invention is specifically related to the automatically controlled management unit of a kind of engine gas, belongs to field of engine control.
Background technique
At present, in engine gas ECU (Electrical Control Unit) design proposal, generally adopt by each functional circuit and adopt separately an integrated chip, even several integrated chips are realized, then by main control unit, coordinated to control, be that ECU (Electrical Control Unit) is divided into main control unit, idle speed step motor driver element, PMU, reset processing unit, driver output unit, low limit, K line communication unit, CAN communication unit, detonation signal processing unit, storage unit, igniting driver element, oil spout driver element, each unit adopts independently special integrated chip, recombinant switching value input unit, frequency signal input unit, analogue signal input unit (Fig. 1).The number of chips that whole like this ECU (Electrical Control Unit) adopts is more, and cost is relatively high.Another kind is assisted processing unit by increase, the disclosed engine electric-controlled unit of Chinese patent CN101235786 (Fig. 2) for example, except main control unit, two association's processing units have been increased, association's processing unit is used for assisting to drive idle speed step motor, another one association processing unit adopts software approach to process igniting feedback, and the data after association's processing unit processes send main control unit to and carry out.The ECU (Electrical Control Unit) of this structure, owing to having increased association's processing unit, not only causes the reduction of whole system execution speed and efficiency especially, and increases the raising that assist process unit has more caused cost.
In addition, switching value input signal processing circuit in above-mentioned ECU (Electrical Control Unit), adopt fixing pull-up resistor or pull down resistor mode to realize, when ECU (Electrical Control Unit) is applied to different vehicles, useful signal Type-Inconsistencies due to switching signal, cause ECU (Electrical Control Unit) versatility poor, different automobile types need to design different switching value input signal processing circuit, has increased development cost.
The lambda sensor that detects exhaust gas component, it works and need to reach certain temperature, when vehicle launch, temperature is lower, and lambda sensor can not effectively be worked, and only has when vehicle launch a period of time, when exhaust temperature reaches lambda sensor operating temperature, lambda sensor could be worked.And prior art is for lambda sensor is just worked when the engine start, conventionally adopt the method for forcing heating, lambda sensor is worked in advance, to reach the effulent of controlling reduce start up period.Prior art lambda sensor adds thermal recovery integrated chip and drives, and integrated chip drives heating efficiency relative deficiency, the time lag that easily causes lambda sensor to work, and the actual engine start stage effulent minimizing decrement that causes is not obvious, still there will be and exceeds standard.Although can be by a plurality of driving passages of integrated chip in parallel to increase heating efficiency, but so not only can too much take chip channel, cause the reduction of integrated chip functional utilization, and multichannel is for heating the increase that also can cause chip heating value, objective heat radiation difficulty, meeting speed-up chip is aging, reduction reliability.
Besides, prior art electrical control unit of petrol engine, igniting feedback signal adopts electric resistance partial pressure to gather fire signal, is input to main control unit, by magnitude of voltage, judges whether effective IGNITION CONTROL oil spout.But because ignition signal voltage is high to upper hectovolt, and in igniting process, voltage signal fluctuation is larger.Adopt this structural circuit, after dividing potential drop, voltage can produce fluctuation equally, makes to obtain voltage value by analog-to-digital conversion and also easily produces fluctuation, thereby cause inaccurate that ignition effectiveness is judged, thereby can not effectively control oil spout, also can affect emission compliance.Secondly, electric resistance partial pressure gathers fire signal and also has a shortcoming, for each cylinder igniting output signal, all need to have an igniting feeder loop, detect respectively each cylinder igniting output, cause engine cylinder number more, repeat circuit is more, causes cost to increase, and is difficult to guarantee to control Optimizing Combustion and reaches standard.
Summary of the invention
For the problems referred to above, the technical problem to be solved in the present invention is to provide that a kind of integrated circuit is simple in structure, igniting detects safety and the stronger automatically controlled management unit of engine gas of heat driven ability.
The automatically controlled management unit of engine gas of the present invention, comprise main control unit, and the igniting being connected with main control unit respectively drives and igniting feeder loop, oil spout driving and fault diagnosis circuit, the driving of low limit and fault diagnosis circuit, stepper motor driving and fault diagnosis circuit, lambda sensor heating and fault diagnosis circuit, analog input signal processing unit, switching value input signal processing unit, data storage cell, detonation signal processing unit, frequency signal processing circuit, power supply and reset management unit and communication unit;
Described main control unit adopts 16 8-digit microcontroller C167CS main control chips, and is externally connected to crystal oscillation circuit, and the frequency of described crystal oscillation circuit is 8MHz;
Described igniting drives and igniting feeder loop comprises ignition drive circuit and igniting feeder loop; Described ignition drive circuit is provided with two-way igniting and drives, and current-limiting resistance, IGBT pipe, consists of; Described ignition drive circuit input fire signal goes out from the Ign_1 termination of main control unit; Described igniting feeder loop is comprised of dividing potential drop cladding circuit, hysteresis comparator and elegant reference circuit; Described ignition drive circuit output signal picks out from IGBT pipe, and accesses the input end of the dividing potential drop cladding circuit of rear class igniting feeder loop;
Described oil spout driving and fault diagnosis circuit adopt and drive chip TLE6220, drive four road fuel injection signals; Described driving chip TLE6220 and main control chip are by spi bus communication, and its reset signal input port connects the reset output of main control chip, and drive output is connected to respectively anti-interference capacitor;
Described low limit drives and fault diagnosis circuit adopts low limit to drive chip L9825, the control signal of main relay and engine speed output is by B_MainRly and B_EngineSpeed signal access parallel control, and other drive signal to send into L9825 by spi bus and control driving; In the main relay drive circuit that described low limit drives chip L9825 to connect, access diode;
Described stepper motor drives and fault diagnosis circuit adopts stepper motor to drive chip L9935, and its driver output port is connected to shunt resistor;
Described lambda sensor heating and fault diagnosis circuit are comprised of switch driving circuit and resistor voltage divider circuit testing circuit; Described switch driving circuit adopts metal-oxide-semiconductor IRLR2905 to drive the heating of lambda sensor heating stick, and metal-oxide-semiconductor gate pole is connected to current-limiting resistance; Between described resistor voltage divider circuit testing circuit, be connected to RC eliminator;
Described analog input signal processing unit comprises voltage signal processing circuit and cell voltage signal processing circuit after suction pressure signal processing circuit, throttle position signal processing circuit, evaporator temperature sensor signal processing circuit, cooling-water temperature transmitter signal processing circuit, intake air temperature sensor signal processing circuit, front oxygen sensor signal processing circuit and rear oxygen oxygen sensor signal processing circuit, ignition switch;
Described switching value input signal processing unit comprises Der StandlichtScheinwerfer und Parkleuchtenschalter signal processing circuit, air-conditioning demand signal processing circuit and air condition compressor switching signal processing circuit;
Described data storage cell adopts Flash chip M29F499BB, directly by 16 bit data address bus modes, is connected with main control chip;
Described detonation signal processing unit adopts detonation signal process chip HIP9011 to connect main control chip port by spi bus;
Described frequency signal processing circuit comprises camshaft signal processing circuit, vehicle speed signal processing circuit and crankshaft signal processing circuit;
Described power supply and reset management unit, communication unit and crankshaft signal processing circuit adopt integrated chip L9741 to connect to form;
Further, described crankshaft signal processing circuit is comprised of bleeder circuit, eliminator and difference hysteresis loop comparator.
Further, described power supply and reset management unit are exported three road 5V voltages, access respectively ECU (Electrical Control Unit), air inlet pressure sensor and throttle position sensor power supply.
Further, described power supply and reset management unit are exported three road 5V voltages, are all connected to ripple filtering electric capacity.
Further, described communication unit is connected the signal end of main control chip by the inner integrated CAN communication receiving/transmission device of integrated chip L9741 with K line communication receiving/transmission device.
Beneficial effect of the present invention: integrated circuit of the present invention is simple in structure, employing is by the crankshaft signal processing circuit in power supply and reset management unit, communication unit, frequency signal input unit, by discrete individual chips, changing integrated combination into is completed by a L9741 integrated chip, not only reduced by three discrete circuit units, significantly reduce the use amount of integrated chip, thereby reach the object reducing costs; And minimizing device makes board structure of circuit compact, reduced circuit board footprints, simultaneously by the lambda sensor heat driven circuit of being controlled by integrated chip, using discrete device instead builds, to improve heat driven ability, the rapid heating of realization to lambda sensor, it is reached with engine operation almost synchronouss working, and igniting feedback voltage-dividing detection circuit, employing comparison circuit is realized, not only improved the reliability that igniting detects, reduced because the oil spout unburned that catches fire causes discharge and increase, thereby guarantee to meet high standard emission request.
Accompanying drawing explanation
For ease of explanation, the present invention is described in detail by following concrete enforcement and accompanying drawing.
Fig. 1 is the overall structure schematic diagram of a kind of ECU (Electrical Control Unit) of prior art;
Fig. 2 is the overall structure schematic diagram of the another kind of ECU (Electrical Control Unit) of prior art;
Fig. 3 is the overall structure schematic diagram of embodiment of the present invention ECU (Electrical Control Unit);
Fig. 4 is the first portion of embodiment of the present invention main control chip;
Fig. 5 is the second portion of embodiment of the present invention main control chip;
Fig. 6 is the structural drawing of embodiment of the present invention ignition drive circuit;
Fig. 7 is the structural drawing of embodiment of the present invention igniting feeder loop;
The structural drawing of the oil spout driving of Fig. 8 the invention process and fault diagnosis circuit;
Fig. 9 is the structural drawing of the embodiment of the present invention low limit driving and fault diagnosis circuit;
Figure 10 is the structural drawing of the driving of embodiment of the present invention stepper motor and fault diagnosis circuit;
Figure 11 is the structural drawing of the heating of embodiment of the present invention lambda sensor and fault diagnosis circuit;
Figure 12 is the structural drawing of embodiment of the present invention suction pressure signal processing circuit;
Figure 13 is the structural drawing of embodiment of the present invention throttle position signal processing circuit;
Figure 14 is the structural drawing of embodiment of the present invention evaporator temperature sensor signal processing circuit;
Figure 15 is the structural drawing of embodiment of the present invention cooling-water temperature transmitter signal processing circuit;
Figure 16 is the structural drawing of embodiment of the present invention intake air temperature sensor signal processing circuit;
Figure 17 is the structural drawing of oxygen sensor signal processing circuit before the embodiment of the present invention;
Figure 18 is the structural drawing of embodiment of the present invention post oxygen sensor signal processing circuit;
Figure 19 is the structural drawing of voltage signal processing circuit after embodiment of the present invention ignition switch;
Figure 20 is the structural drawing of embodiment of the present invention cell voltage signal processing circuit;
Figure 21 is the structural drawing of embodiment of the present invention Der StandlichtScheinwerfer und Parkleuchtenschalter signal processing circuit;
Figure 22 is the structural drawing of embodiment of the present invention air-conditioning demand signal processing circuit;
Figure 23 is the structural drawing of embodiment of the present invention air condition compressor switching signal processing circuit;
Figure 24 is the structural drawing of embodiment of the present invention data storage cell;
Figure 25 is the structural drawing of embodiment of the present invention detonation signal processing unit;
Figure 26 is the structural drawing of embodiment of the present invention camshaft signal processing circuit;
Figure 27 is the structural drawing of embodiment of the present invention vehicle speed signal processing circuit;
Figure 28 is the structural drawing of embodiment of the present invention crankshaft signal processing circuit;
Figure 29 is the structural drawing of embodiment of the present invention power supply and reset management unit;
Figure 30 is the structural drawing of embodiment of the present invention communication unit.
Embodiment
As shown in Figure 3, the automatically controlled management unit of engine gas of the present invention, comprise main control unit 1, and the igniting being connected with main control unit 1 respectively drives and igniting feeder loop 2, oil spout driving and fault diagnosis circuit 3, low limit drives and fault diagnosis circuit 4, stepper motor drives and fault diagnosis circuit 5, lambda sensor heating and fault diagnosis circuit 6, analog input signal processing unit 7, switching value input signal processing unit 8, data storage cell 9, detonation signal processing unit 10, frequency signal processing circuit 11, power supply and reset management unit 12 and communication unit 13, realizing main control chip controls the management of each element circuit,
As shown in Figure 4 and Figure 5, described main control unit 1 adopts high-performance 16 8-digit microcontroller C167CS main control chips, and simultaneously and be externally connected to crystal oscillation circuit, the frequency of described crystal oscillation circuit is 8MHz;
As shown in Figure 6 and Figure 7, described igniting driving and igniting feeder loop 2 comprise ignition drive circuit and igniting feeder loop; Described ignition drive circuit is provided with two-way igniting and drives, and current-limiting resistance R32 and IGBT pipe Q101, consists of; Described IGBT pipe Q101 adopts STGB10NB40LZ, and its ignition drive circuit input fire signal goes out from the Ign_1 termination of main control chip, through current-limiting resistance R32, connects IGBT pipe gate pole, controls IGBT switch, thereby controls igniting; Described igniting feeder loop is comprised of dividing potential drop cladding circuit, hysteresis comparator and elegant reference circuit; Resistance R 42, resistance R 49 and diode D8 form dividing potential drop cladding circuit, R42 and R49 are to fire signal dividing potential drop (wherein R42 and R49 get respectively 68 kilo-ohms and 10 kilo-ohms), the voltage of diode D8 after to dividing potential drop carries out clamper, and the voltage after dividing potential drop is remained within the scope of 0-5V.IgnOut_1 and IgnOut_2 are two-way igniting output signals, respectively through preventing diode D6 and the D7 of reversal connection, after the negative terminal of two diodes connects, through the reverse input end of resistance R 42 access comparators; Stagnant ring comparison circuit consists of resistance R 46, R48 and comparator LM2903, and resistance R 47 is comparator output terminal IgnFb default conditions pull-up resistors, and the IgnFb end while guaranteeing not light a fire of take is high level, and comparator output terminal connects Master control chip port IgnFb.Voltage reference circuit is comprised of resistance R 44 and R45, to 5V power supply dividing potential drop, produces the benchmark voltage of 2.5V at the tie point of resistance R 44 and R45, and reference signal access comparator is input end in the same way;
As shown in Figure 8, described oil spout driving and fault diagnosis circuit 3 adopt and drive chip TLE6220, drive four road fuel injection signals, are respectively Inj_1 to Inj_4, and drive output corresponds to InjOut_1 to InjOut_4, connects oil sprayer signal port.TLE6220 and Master control chip are by spi bus communication, driver circuit fault message is fed back to Master control chip, and SCLK, MOSI, MISO are spi bus ports, and CS_Inj is chip selection signal port, ResetIn is reset signal input port, connects the reset output of Master control chip.At drive output access anti-interference capacitor, capacitor C 74, C75, C76, C77, avoid interference simultaneously;
As shown in Figure 9, described low limit drives and fault diagnosis circuit 4 adopts low limits to drive chip L9825, supports 8 roads to drive, the wherein first via and the second tunnel compatibility parallel drive and driven in series, and driven in series pattern is only supported on other six tunnel.The chip selection signal port of L9825 is CS_Drv2, and reseting controling signal port is ResetIn.The control signal of main relay and engine speed output is by B_MainRly and B_EngineSpeed parallel control, and the driving signal of other device sends to L9825 by spi bus.In the drive circuit of main relay, for avoiding misleading because main relay misconnection makes main relay, in drive circuit, accessed diode D2, so relay can only externally be controlled termination battery power, L9825 and is output as conducting when low.Trouble signal on each driver circuit feeds back to Master control chip by spi bus;
As shown in figure 10, described stepper motor drives and fault diagnosis circuit 5 adopts stepper motor to drive chip L9935, and wherein capacitor C 78, C79, C80 are chip internal Circuit Matching electric capacity, and resistance R 109 and R110 are diagnosis resistance.Wherein better method is driver output port shunt resistor R107 and a R108, in parallel with the internal resistance of stepper motor two-phase respectively, increases diagnosis electric current, improves diagnosis efficiency.EN_MotorDvr is the enable port of chip, and CS_MotorDvr is that the sheet of chip selects port, and SCLK, MOSI, MISO are spi bus ports;
As shown in figure 11, described lambda sensor heating and fault diagnosis circuit 6 are comprised of switch driving circuit and resistor voltage divider circuit testing circuit, can, in ternary catalyzing unit front end and back end, be respectively arranged with front lambda sensor and post oxygen sensor; Described switch driving circuit adopts metal-oxide-semiconductor IRLR2905 to drive the heating of lambda sensor heating stick, between PWM_O2UpHeater end and metal-oxide-semiconductor gate pole, is connected current-limiting resistance R73, and it is the PWM heat driven signal end of Master control chip that PWM_O2UpHeater holds; Fault diagnosis circuit adopts electric resistance partial pressure diagnostic circuit, three divider resistance resistance R 75, R76, R77 form, between voltage sample point (tie point of resistance R 75 and R76) and drive output PWM_O2HeaterOut, seal in a resistance (resistance R 74), on voltage sample point, connect pull-up resistor (resistance R 75) and pull down resistor (resistance R 76) simultaneously.Between the sampled point the other end and Master control chip port V_DiagUpOxygen, access RC eliminator (resistance R 77 and capacitor C 67 form), sampled voltage signal is carried out to filtering;
As shown in Figure 12 to Figure 20, described analog input signal processing unit 7 comprises voltage signal processing circuit and cell voltage signal processing circuit after suction pressure signal processing circuit, throttle position signal processing circuit, evaporator temperature sensor signal processing circuit, cooling-water temperature transmitter signal processing circuit, intake air temperature sensor signal processing circuit, front oxygen sensor signal processing circuit, rear oxygen oxygen sensor signal processing circuit, ignition switch; Wherein:
Figure 12 is suction pressure signal processing circuit, and it is comprised of pull down resistor R51 and RC eliminator R50, C48.Sensor signal is from the input of S_IntakePres end, and through resistance R 51 and sensor internal electric resistance partial pressure, after RC eliminator, signal accesses the analog input port V_IntakePres of Master control chip; Figure 13 is that throttle position signal processing circuit, Figure 14 are that evaporator temperature sensor signal processing circuit, Figure 15 are that cooling-water temperature transmitter signal processing circuit, Figure 16 are intake air temperature sensor signal processing circuit, foregoing circuit structure is basic identical, by the pull-up resistor of 5V power supply VCC and RC eliminator are formed.Throttle position signal processing circuit is by pull-up resistor R52, resistance R 53 and capacitor C 50 form RC filtering, sensor signal is from the input of S_ThrottlePos end, after drawing on 52 pairs of 5V power supplys of resistance R, through the filtering of RC eliminator, be input to the analog input port V_ThrottlePos of Master control chip; Figure 17 and Figure 18 are respectively front oxygen sensor signal processing circuit and rear oxygen oxygen sensor signal processing circuit, two processing circuits are identical, front oxygen sensor signal processing circuit, is comprised of switching circuit (resistance R 83, R84 and triode Q12), bleeder circuit (resistance R 85, R86, R88) and RC eliminator (resistance R 87 and capacitor C 70).The divider resistance of bleeder circuit is selected by switching circuit, and switching circuit closed condition realizes oxygen sensor voltage input; Switching circuit open mode, realizes lambda sensor internal resistance measurement.S_OxygenUp is sensor signal output terminal, and B_R_OxygenUp is Master control chip control end, controls Q12 switch.Q12 conducting, resistance R 85, R86 and R88 form bleeder circuit, and Q12 closes, and R86 and R88 form bleeder circuit.R87 and C70 form RC eliminator.The analog input port V_OxygenUp of signal access Master control chip after processing; Figure 19 is voltage signal processing circuit after ignition switch, by bleeder circuit (resistance R 69, R70) and eliminator (capacitor C 63), formed, resistance R 69 and R70 to ignition switch after voltage V_IgnitionKey dividing potential drop, the analog input port V_IgnitionKeyIn of signal access Master control chip; Figure 20 is cell voltage signal processing circuit, bleeder circuit (resistance R 71, R72) and eliminator (capacitor C 65), consists of, and resistance R 71 and R72 are to battery voltage VB dividing potential drop, and signal accesses the analog input port V_VB_In of Master control chip;
As shown in Figure 21 to Figure 23, described switching value input signal processing unit 8 comprises Der StandlichtScheinwerfer und Parkleuchtenschalter signal processing circuit, air-conditioning demand signal processing circuit and air condition compressor switching signal processing circuit; Three processing circuits are identical, and by configuring resistance (pull-up resistor R60, pull down resistor R60 ') and eliminator, (resistance R 18 and capacitor C 54 form lamp switch signal processing circuit.Sensor signal output terminal, dispose pull-up resistor R60 and pull down resistor R60 ' simultaneously, according to the life type of switching signal, select respectively one to be connected, if the life type of switching signal is low level, select pull-up resistor R60, in circuit, do not connect pull down resistor R60 '; If the life type of switching signal is high level, select pull down resistor R60 ', do not select pull-up resistor R60.Switching signal is from the input of K_HeadLamp port, and process configures resistance, eliminator, the port B_HeadLamp of signal access Master control chip after processing.Resistance R 18 also plays metering function, and restriction flows into the electric current of Master control chip port;
As shown in figure 24, described data storage cell 9, for storing automatically controlled unit controls program and service data, adopts the Flash chip M29F499BB of ST company production, storage space 512KB, and sectional management is supported in memory block, data memory segment management flexibly.M29F400BB is directly connected by 16 bit data address bus modes with Master control chip;
As shown in figure 25, described detonation signal processing unit 10, for judging whether pinking of motor, is converted to analog signals by irregular detonation signal.The special-purpose detonation signal process chip HIP9011 that adopts INTELSIL company to produce in embodiment.The processing circuits such as the inner integrating filtering of HIP9011, amplification, integration.Sensor signal is from the access of S_Knock port, and the voltage signal of processing through HIP9011 is delivered to the analog input channel V_KonckIn of Master control chip.The external resistance capacitance of HIP9011 is used regulation coupling according to chip.HIP9011 is by spi bus setting signal processing parameter, and SCLK, MOSI, MISO are spi bus ports, connects Master control chip port.CS_Konck is the chip selection signal port of HIP9011.KnockHold is the retentive control signal that Master control chip chip is exported to HIP9011.CLKOUT is the CLK clock output of Master control chip, and HIP9011 CLK clock is provided;
As shown in Figure 26, Figure 27 and Figure 28, described frequency signal processing circuit 11 comprises camshaft signal processing circuit, vehicle speed signal processing circuit and crankshaft signal processing circuit, and Figure 26 is camshaft signal processing circuit, processes Hall-type camshaft-signal sensor signal.By pull-up resistor R65 and limiting filter circuit (resistance R 66 and capacitor C 60), formed.Sensor signal accesses from S_Cam, through pull-up resistor R65, eliminator, and the port CamIn of the signal access Master control chip after processing, R66 also plays metering function, and restriction flows into the electric current of Master control chip; Figure 27 is vehicle speed signal processing circuit, processes Hall-type camshaft vehicle speed sensor signal.By protective circuit (diode D2), pull-up resistor R67, limiting filter circuit (resistance R 68 and capacitor C 62), formed.Protection diode D9 flows into Master control chip port for preventing larger electric current.Sensor signal accesses from S_VSpeed, through D9, and pull-up resistor, eliminator, and after resistance R 68 current limlitings, access the port VSpeedIn of Master control chip; Figure 28 is crankshaft signal processing circuit, is mainly used in the sinusoidal wave signal from magnetoelectric crankshaft sensor, converts square signal output to, supplies with Master control chip.This circuit is selected the electric circuit constitute by bleeder circuit, eliminator, difference hysteresis input pattern.Wherein bleeder circuit consists of resistance R 28 and crankshaft sensor internal resistance, while inputting to reduce sensor high voltage, and the voltage magnitude of chip I N_P and IN_M end; The connection of sensor anode forms eliminator by resistance R 26 and capacitor C 41, and negative terminal is connected with resistance R 30 and capacitor C 42 forms eliminators, and input signal is carried out to filtering, and after filtering, signal connects respectively input end IN_P and the IN_M of chip internal differential comparator; Mode selection terminal, by a pull-up resistor R31, is chosen as low difference hysteresis input pattern.After processing, signal is exported from 30 pin, through current-limiting resistance R27, is connected to Master control chip port CrankIn;
As shown in figure 29, described power supply and reset circuit 12 are mainly used in power management and system reset.Power management is 5V voltage by storage battery 14V voltage transitions, supplies with whole ECU (Electrical Control Unit) and operative sensor.Battery power is effective, has one when effective in ignition key signal or power enable signal, and L9741 processes output three road 5V voltages, is respectively ECU (Electrical Control Unit), air inlet pressure sensor and throttle position sensor power supply.Automobile storage battery power supply enters from VBat termination, through over commutation (D3), capacitor filtering (C22), anti-reverse impact (TVS manages D2) and ripple filtering, processes the power input VBAT that (capacitor C 23, C24) is input to L9741; Ignition key switch signal is inputted from V_IgnitionKey, through RC filtering (C28, C29 and R21), resistance current limliting (R21), pull down resistor (R20) circuit, is input to KEYIN end; The PowerLatchCtrl enable signal of Master control chip output is from the input of ENABLE end.Three road 5V power supplys are respectively from VDD, VS1, VS2 output, 5V power supply VCC provides ECU (Electrical Control Unit) power supply, (capacitor C 26 and C27) processed in the filtering of access ripple, 5V power supply VCC_TMAP provides air inlet pressure sensor power supply, (capacitor C 31, C32, C33) processed in the filtering of access ripple, 5V power supply VCC_S_TP provides throttle position sensor power supply, and (capacitor C 37, C38, C39) processed in the filtering of access ripple.Reset circuit realization in the reset constantly that powers on, guarantees synchronous to whole ECU (Electrical Control Unit).The inner integrated reset processing circuit of L9741, the resistance R 22 being connected in parallel and capacitor C 30, be the RC vibrator circuit of internal reset circuit, reset signal, from the output of ResetIn end, connects the reset signal input end of other circuit of ECU (Electrical Control Unit);
As shown in figure 30, communication unit shown in 13 is by the inner integrated CAN communication receiving/transmission device of L9741 and K line communication receiving/transmission device.Wherein CAN communication is for ECU (Electrical Control Unit) and the communication of gearbox control unit, and the communication of K line is for ECU (Electrical Control Unit) and failure diagnosis apparatus communication.CAN transceiver input port TXC and RXC are connected respectively CanTxOut and the CanRxIn of Master control chip, and output terminal is connected in series respectively two resistance R 23 and R24 (all adopting 60.4 ohm of resistances in enforcement, for mating communicating terminal resistance).K line transceiver input port MTX1 and KEY1 are connected respectively K_TxOut and the K_RxIn of Master control chip, and output terminal KwpOut connects a pull-up resistor R25 to power supply VB, and when there is no communication signal output, voltage does not remain VB;
Integrated circuit of the present invention is simple in structure, employing is by the crankshaft signal processing circuit in power supply and reset management unit, communication unit, frequency signal input unit, by discrete individual chips, changing integrated combination into is completed by a L9741 integrated chip, not only reduced by three discrete circuit units, significantly reduce the use amount of integrated chip, thereby reach the object reducing costs; And minimizing device makes board structure of circuit compact, reduced circuit board footprints, simultaneously by the lambda sensor heat driven circuit of being controlled by integrated chip, using discrete device instead builds, to improve heat driven ability, the rapid heating of realization to lambda sensor, it is reached with engine operation almost synchronouss working, and igniting feedback voltage-dividing detection circuit, employing comparison circuit is realized, not only improved the reliability that igniting detects, reduced because the oil spout unburned that catches fire causes discharge and increase, thereby guarantee to meet high standard emission request.
Embodiment recited above is described the preferred embodiment of the present invention, not the spirit and scope of the present invention is limited.Do not departing under the prerequisite of design concept of the present invention; various modification and improvement that related domain ordinary person makes technological scheme of the present invention; all should drop into protection scope of the present invention, the technology contents that the present invention asks for protection, is all documented in claims.
Claims (5)
1. the automatically controlled management unit of engine gas, it is characterized in that: comprise main control unit, and the igniting being connected with main control unit respectively drives and igniting feeder loop, oil spout driving and fault diagnosis circuit, the driving of low limit and fault diagnosis circuit, stepper motor driving and fault diagnosis circuit, lambda sensor heating and fault diagnosis circuit, analog input signal processing unit, switching value input signal processing unit, data storage cell, detonation signal processing unit, frequency signal processing circuit, power supply and reset management unit and communication unit;
Described main control unit adopts 16 8-digit microcontroller C167CS main control chips, and is externally connected to crystal oscillation circuit, and the frequency of described crystal oscillation circuit is 8MHz;
Described igniting drives and igniting feeder loop comprises ignition drive circuit and igniting feeder loop; Described ignition drive circuit is provided with two-way igniting and drives, and current-limiting resistance, IGBT pipe, consists of; Described ignition drive circuit input fire signal goes out from the Ign_1 termination of main control unit; Described igniting feeder loop is comprised of dividing potential drop cladding circuit, hysteresis comparator and elegant reference circuit; Described ignition drive circuit output signal picks out from IGBT pipe, and accesses the input end of the dividing potential drop cladding circuit of rear class igniting feeder loop;
Described oil spout driving and fault diagnosis circuit adopt and drive chip TLE6220, drive four road fuel injection signals; Described driving chip TLE6220 and main control chip are by spi bus communication, and its reset signal input port connects the reset output of main control chip, and drive output is connected to respectively anti-interference capacitor;
Described low limit drives and fault diagnosis circuit adopts low limit to drive chip L9825, the control signal of main relay and engine speed output is by B_MainRly and B_EngineSpeed signal access parallel control, and other drive signal to send into L9825 by spi bus and control driving; In the main relay drive circuit that described low limit drives chip L9825 to connect, access diode;
Described stepper motor drives and fault diagnosis circuit adopts stepper motor to drive chip L9935, and its driver output port is connected to shunt resistor;
Described lambda sensor heating and fault diagnosis circuit are comprised of switch driving circuit and resistor voltage divider circuit testing circuit; Described switch driving circuit adopts metal-oxide-semiconductor IRLR2905 to drive the heating of lambda sensor heating stick, and metal-oxide-semiconductor gate pole is connected to current-limiting resistance; Between described resistor voltage divider circuit testing circuit, be connected to RC eliminator;
Described analog input signal processing unit comprises voltage signal processing circuit and cell voltage signal processing circuit after suction pressure signal processing circuit, throttle position signal processing circuit, evaporator temperature sensor signal processing circuit, cooling-water temperature transmitter signal processing circuit, intake air temperature sensor signal processing circuit, front oxygen sensor signal processing circuit and rear oxygen oxygen sensor signal processing circuit, ignition switch;
Described switching value input signal processing unit comprises Der StandlichtScheinwerfer und Parkleuchtenschalter signal processing circuit, air-conditioning demand signal processing circuit and air condition compressor switching signal processing circuit;
Described data storage cell adopts Flash chip M29F499BB, directly by 16 bit data address bus modes, is connected with main control chip;
Described detonation signal processing unit adopts detonation signal process chip HIP9011 to connect main control chip port by spi bus;
Described frequency signal processing circuit comprises camshaft signal processing circuit, vehicle speed signal processing circuit and crankshaft signal processing circuit;
Described power supply and reset management unit, communication unit and crankshaft signal processing circuit adopt integrated chip L9741 to connect to form.
2. the automatically controlled management unit of engine gas according to claim 1, is characterized in that: described crankshaft signal processing circuit is comprised of bleeder circuit, eliminator and difference hysteresis loop comparator.
3. the automatically controlled management unit of engine gas according to claim 1, is characterized in that: described power supply and reset management unit are exported three road 5V voltages, accesses respectively ECU (Electrical Control Unit), air inlet pressure sensor and throttle position sensor power supply.
4. the automatically controlled management unit of engine gas according to claim 3, is characterized in that: described power supply and reset management unit are exported three road 5V voltages, are all connected to ripple filtering electric capacity.
5. the automatically controlled management unit of engine gas according to claim 1, is characterized in that: described communication unit is connected the signal end of main control chip by the inner integrated CAN communication receiving/transmission device of integrated chip L9741 with K line communication receiving/transmission device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410259391.9A CN104088711A (en) | 2014-06-12 | 2014-06-12 | Electrical control management unit for engine fuel gas |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410259391.9A CN104088711A (en) | 2014-06-12 | 2014-06-12 | Electrical control management unit for engine fuel gas |
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