CN110672331A - Wide-range oxygen sensor signal acquisition and signal simulation control unit - Google Patents
Wide-range oxygen sensor signal acquisition and signal simulation control unit Download PDFInfo
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- CN110672331A CN110672331A CN201910590578.XA CN201910590578A CN110672331A CN 110672331 A CN110672331 A CN 110672331A CN 201910590578 A CN201910590578 A CN 201910590578A CN 110672331 A CN110672331 A CN 110672331A
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/10—Testing internal-combustion engines by monitoring exhaust gases or combustion flame
- G01M15/102—Testing internal-combustion engines by monitoring exhaust gases or combustion flame by monitoring exhaust gases
- G01M15/104—Testing internal-combustion engines by monitoring exhaust gases or combustion flame by monitoring exhaust gases using oxygen or lambda-sensors
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
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- G05B17/02—Systems involving the use of models or simulators of said systems electric
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
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- G05B2219/00—Program-control systems
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- G05B2219/00—Program-control systems
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Abstract
The invention relates to a signal acquisition and signal simulation control unit of a wide-area oxygen sensor, which comprises a signal acquisition unit, a control unit and a signal simulation unit; the input end of the signal acquisition unit is connected with the wide-area oxygen sensor and is used for acquiring the real signal of the engine acquired by the wide-area oxygen sensor; the output end of the signal acquisition unit is connected with the input end of the signal simulation unit, and the output end of the signal simulation unit is connected to the gasoline controller and used for outputting a control simulation control signal; the control unit is connected with the enabling end of the signal simulation unit and used for accurately and quantitatively offsetting the real signal of the engine, so that the output simulation control signal has a lean or rich offset compared with the real engine signal. The wide-range oxygen sensor simulation unit provided by the control unit completely depends on the signal of the wide-range oxygen sensor and is not limited by the acquisition signal of the gasoline ECU wide-range oxygen sensor, so that the wide-range oxygen sensor simulation unit provided by the unit has higher adaptability.
Description
Technical Field
The invention relates to an automobile gas control system, in particular to a wide-area oxygen sensor signal acquisition and signal simulation control unit.
Background
The current six-vehicle type system adopts a wide-area oxygen sensor as a signal input unit for detecting the combustion state of the fuel of the vehicle, and the signal fed back by the wide-area oxygen sensor is input into an ECU of a vehicle controller so as to accurately analyze the current combustion state and output a control signal for next combustion input. Therefore, in the refitting process of the gas system of the six-vehicle type in China, whether the gas system can accurately acquire the wide-area oxygen sensor signal and output the signal to the gasoline ECU according to the self requirement or not is crucial to the vehicle performance calibration, the drivability calibration and the emission calibration of the gas system of the dual-purpose fuel vehicle. In the original dual-purpose fuel vehicle system, a combustion state feedback sensor generally adopts a narrow-area oxygen sensor. The signal of the narrow-area oxygen sensor is simply a switch-type signal, and the corresponding signal acquisition unit and the corresponding simulation unit are simpler, but the precision and the accuracy of the signal are not high. With the increasing tightening of national emission regulations and the increasing demand for vehicle emission control, wide-area oxygen sensors will be used in place of narrow-area oxygen sensors. The wide-range oxygen sensor is completely adopted in the six-model state, the signal precision output by the wide-range oxygen sensor is greatly improved, and the signal acquisition and simulation unit is extremely complex. At present, wide-range oxygen sensor acquisition units are widely applied in the market, but a large variety of oxygen sensor acquisition units are built by discrete devices, so that the circuits are huge and complex. The signal simulation units aiming at the wide-area oxygen sensor are more few, and become a technical problem because the signal complexity of the wide-area oxygen sensor and the signal acquisition units aiming at the wide-area oxygen sensor of each main engine plant are different.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a wide-range oxygen sensor signal acquisition and signal simulation control unit, the wide-range oxygen sensor simulation unit provided by the control unit completely depends on the signal of the wide-range oxygen sensor and is not limited by the acquisition signal of the gasoline ECU wide-range oxygen sensor, and the wide-range oxygen sensor simulation unit provided by the control unit has higher adaptability.
The purpose of the invention is realized by the following technical scheme:
a signal acquisition and signal simulation control unit of a wide-area oxygen sensor comprises a signal acquisition unit, a control unit and a signal simulation unit;
the input end of the signal acquisition unit is connected with the wide-area oxygen sensor and is used for acquiring the real signal of the engine acquired by the wide-area oxygen sensor;
the output end of the signal acquisition unit is connected with the input end of the signal simulation unit, and the output end of the signal simulation unit is connected to the gasoline controller and used for outputting a control simulation control signal;
the control unit is connected with the enabling end of the signal simulation unit and used for accurately and quantitatively offsetting the real signal of the engine, so that the output simulation control signal has an offset which is lean or rich compared with the real engine signal.
Further, the signal collecting unit uses the linear sensor chip CJ125 as a control unit.
Further, the control unit selects a single chip microcomputer as a processor, and the type of the single chip microcomputer is MC9S12XET256 MAL.
Furthermore, the signal simulation unit comprises an enabling module, a sensor internal temperature detection and Nernst voltage process screening module and a Nernst voltage simulation module;
the enabling module comprises a relay RLY3 for disconnecting the gasoline computer ECU and the wide-area oxygen SENSOR energy Steve voltage UN line, the gasoline computer ECU end is set as a UN _ ECU end, and the wide-area oxygen SENSOR energy Steve voltage UN line end is set as a UN _ SENSOR end;
the No. 3 pin is connected with the No. 4 pin in an initial state, and a simulation function is not involved;
and after the simulation signal is enabled, the No. 4 pin is connected with the No. 4 pin, and the UN _ SENSOR end is connected with the UN _ ECU through the temperature detection and Nernst voltage process screening module in the SENSOR and the Nernst voltage simulation module to enter a signal simulation mode.
Furthermore, the nernst voltage simulation module consists of an adder/subtracter and a DA chip;
the input end of the adder/subtractor is connected with the UN _ SENSOR end and the DA chip, and quantitative amplitude accumulation or decrement is carried out on the Nernst signal UN _ SENSOR;
the DA chip is used for setting the voltage value output by the DA chip, and the value is the value deviated from the Nernst signal UN _ SENSOR;
the adder/subtractor output is connected to pin No. 5 of the relay RLY 3.
Furthermore, the DA chip is used for setting the output voltage value thereof in an SPI bus communication mode.
Further, a digital switch U2 is connected between the UN _ SENSOR terminal and the pin No. 5 of the relay RLY3 in series;
and a digital switch U1 is connected between the output end of the adder/subtractor and the pin No. 5 of the relay RLY3 in series.
Further, the sensor internal temperature detection and nernst voltage process screening module comprises a comparator;
the positive end of the comparator is connected with the current output signal of the IP pump;
the negative end of the comparator divides voltage through a resistor R707 and a resistor R708 so as to provide a turnover reference voltage for the comparator;
the output end of the comparator is divided into two paths of outputs, one path of output is used for controlling the digital switch U2, and the other path of output sequentially passes through the inverter to control the digital switch U1.
Further, the engine real signal refers to the nernst voltage UN fed back by the wide-range oxygen sensor.
The invention has the beneficial effects that: the scheme is innovated on the basis of deep research on the principle of the wide-range oxygen sensor, the wide-range oxygen sensor simulation unit provided by the control unit completely depends on the signal of the wide-range oxygen sensor and is not limited by the acquisition signal of the gasoline ECU wide-range oxygen sensor, and the wide-range oxygen sensor simulation unit provided by the control unit has higher adaptability. The signal acquisition part of the wide-area oxygen sensor signal acquisition and simulation control unit provided by the invention directly refers to a special chip CJ125 control unit of doctor company to build a circuit for supporting, so that the circuit is simple and convenient to integrate into an ECU (electronic control Unit) of a gas controller. According to the real wide-range oxygen sensor signal acquired by the wide-range oxygen sensor signal acquisition unit, the wide-range oxygen sensor signal simulation unit can carry out deviation towards a large value or a small value on the real signal on the basis, and the deviation amount can be quantitatively and accurately controlled, so that the wide-range oxygen sensor signal input into the gasoline controller has deviation towards a rich value or a lean value compared with the real engine signal.
Drawings
FIG. 1 is a block diagram of the system of the present invention;
FIG. 2 is a circuit diagram of a signal acquisition unit;
FIG. 3 is a circuit diagram of a simulation unit;
FIG. 4 is a Nernst voltage simulation module;
FIG. 5 is a circuit diagram of a sensor internal temperature sensing and Nernst voltage process screening module;
FIG. 6 is a circuit diagram of a wide-area oxygen sensor signal emulation enable module.
Detailed Description
The technical solution of the present invention is further described in detail with reference to the following specific examples, but the scope of the present invention is not limited to the following.
As shown in fig. 1, a wide-area oxygen sensor signal acquisition and signal simulation control unit includes a signal acquisition unit, a control unit and a signal simulation unit; the input end of the signal acquisition unit is connected with the wide-area oxygen sensor and is used for acquiring the real signal of the engine acquired by the wide-area oxygen sensor; the output end of the signal acquisition unit is connected with the input end of the signal simulation unit, and the output end of the signal simulation unit is connected to the gasoline controller and used for outputting a control simulation control signal;
the control unit is connected with the enabling end of the signal simulation unit and used for accurately and quantitatively offsetting a real signal of an engine, so that the output simulation control signal has a dilute offset or a concentrated offset compared with the real engine signal, the signal acquisition unit uses the linear sensor chip CJ125 as a control unit, as shown in figure 2, LSUIUN is connected with a wide-area oxygen sensor Nernst feedback voltage end UN, LSUIVM is connected with a wide-area oxygen sensor virtual ground end VM, LSUIIP is connected with a wide-area oxygen sensor pump oxygen film pump current end IP, LSUIIA is connected with a wide-area oxygen sensor calibration resistance end IA, and LSUIHtN is connected with a wide-area oxygen sensor heating negative end H-.
A21 st pin output lambda value signal of the CJ125 is filtered by external R63/C134 and then collected by AN MCU AN12 port, a 12 nd pin output temperature value signal of the CJ125 is filtered by external R62/C135 and then collected by AN MCU AN11 port, lambda is a term of profession of AN automobile fuel combustion and exhaust system, lambda =1 is a theoretical mixture, lambda >1 is a lean mixture, and lambda <1 is a rich mixture.
The control unit selects a single chip microcomputer as a processor, and the type of the single chip microcomputer is MC9S12XET256 MAL.
Signals of the wide-area oxygen sensor have five lines in total, IP, pump oxygen diaphragm pump current, VM, virtual ground, H, the oxygen sensor heating negative terminal, H < + >, the oxygen sensor heating positive terminal, UN, Nernst feedback voltage. The oxygen sensor is connected with the gasoline ECU by six lines, and an IA (Integrated IA) -calibration resistance line is added compared with the sensor, and the calibration resistance is embedded in a sensor plug. The wide-area oxygen sensor simulation related to the invention needs to disconnect UN (Nernst feedback voltage) and connect IP (pumping oxygen diaphragm pumping current) lines.
As shown in fig. 3, the signal simulation unit includes an enabling module (block iii), a sensor internal temperature detection and nernst voltage process screening module (block ii), and a nernst voltage simulation module (block i). According to the working principle of the wide-range oxygen sensor, the zirconia membrane inside the wide-range oxygen sensor can induce a Nernst voltage value through the difference between the oxygen content in the exhaust gas of the induction chamber and the oxygen content in the atmosphere in the reference chamber. The wide-area oxygen sensing interface chip inside the gasoline controller generates a pump current to act on the pump oxygen diaphragm inside the sensor through the nernst voltage value fed back by oxygen sensing, and the sensed nernst voltage reaches a balance value by pumping oxygen molecules into and out of the sensing chamber. The interface chip can directly calculate the current lambda value by detecting the magnitude of the pump current. The method adopts the simulation of the Nernst voltage UN fed back by the sensor to enable the value to translate on the basis of a real value, thereby changing the magnitude of the output pump current of the interface chip and finally realizing the directional and quantitative translation of the lambda value of the gasoline controller on the basis of the real value.
The gasoline computer and the wide-area oxygen SENSOR can be disconnected with each other through a Wheatstone voltage UN line, one end connected with the gasoline computer is UN _ ECU, and one end connected with the SENSOR is UN _ SENSOR. As shown in FIG. 3, the wide-area oxygen sensing signal simulation module is mainly realized by using a device RLY3 relay, when the relay does not have an enabling signal, the UN _ ECU and the UN _ SENSOR are short-circuited together, and the simulation function is not intervened. When the simulation signal is enabled, the pin of the relay 4/5 is short-circuited, and the UN _ SENSOR is connected with the UN _ ECU through the control modules of the block diagram two and the block diagram three in fig. 3, so as to enter a signal simulation mode. The relay can not influence the normal collection of the sensor signal by the gasoline controller under the condition of abnormal system power supply. The relay can be used under the condition that the system power supply is abnormal, the normal collection of the sensor signals by the gasoline controller cannot be influenced, the relay driving circuit is shown in the right lower corner part of fig. 6, and PB0 is the relay driving signal. The signal is provided for the system MCU, when PB0 is low level, the relay is in the initial working state, pins 4 and 3 are communicated, and pins 9 and 19 are connected. When PB0 is high, the relay operating state switches between pin 4 and 5, and pin 9 and pin 8.
As shown in fig. 6, the enabling module includes a relay RLY3, which disconnects the gasoline computer ECU from the wide-range oxygen SENSOR nernst voltage UN line, the gasoline computer ECU end is set as UN _ ECU end, the wide-range oxygen SENSOR nernst voltage UN line end is set as UN _ SENSOR end; pin 4 of relay RLY3 (hereinafter referred to as relay) is connected with UN _ ECU end, pin 3 is connected with UN _ SENSOR end, and pin 5 is connected with SENSOR internal temperature detection and Nernst voltage process screening module and Nernst voltage simulation module; the No. 3 pin is connected with the No. 4 pin in the initial state, and the simulation function is not involved; and after the simulation signal is enabled, the No. 4 pin is connected with the No. 4 pin, the UN _ SENSOR end is connected with the UN _ ECU through the temperature detection inside the SENSOR, the Nernst voltage process screening module and the Nernst voltage simulation module, and the signal simulation mode is entered.
As shown in fig. 4, the nernst voltage simulation module is composed of an adder/subtractor and a DA chip, wherein an input end of the adder/subtractor is connected with a UN _ SENSOR end and the DA chip, a quantitative amplitude value of the nernst signal UN _ SENSOR is accumulated or decreased, the DA chip is used for setting a voltage value output by the DA chip, the voltage value is a value deviated from the nernst signal UN _ SENSOR, an output end of the adder/subtractor is connected to a pin No. 5 of the relay RLY3, a circuit of the DA chip is shown in a lower left corner of fig. 4, an SPI bus control mode is adopted for controlling the DA chip, MOSI is an SPI data input line, SCK is an SPI clock signal line, and PK7 is an SPI signal chip selection line. When PK7 is pulled low to enable the DA chip SPI bus function, the MCU writes data into the DA chip via the MOSI data input line on the rising edge of the SCK clock. The DA chip internally outputs a corresponding voltage signal through a 7 pin (OUTB) according to the data written by the MCU.
In a preferred embodiment, a digital switch U2 is connected in series between the UN _ SENSOR terminal and pin No. 5 of the relay RLY3, and a digital switch U1 is connected in series between the output terminal of the adder/subtractor and pin No. 5 of the relay RLY 3.
As shown in FIG. 5, the sensor internal temperature detection and Nernst voltage process screening module includes a comparator; the positive end of the comparator is connected with the current output signal of the IP pump; the negative end of the comparator divides voltage through a resistor R707 and a resistor R708 so as to provide a turnover reference voltage for the comparator; the output end of the comparator is divided into two paths of output, one path of output is used for controlling the digital switch U2, and the other path of output sequentially passes through the inverter to control the digital switch U1.
The Nernst voltage UN port is not only a sensor oxygen content difference feedback signal port but also a working temperature detection port in the oxygen sensor. The interface chip of the oxygen sensor in the gasoline controller can detect the current working temperature by injecting an alternating current detection signal with certain frequency and amplitude to the UN port in a mode of detecting the internal resistance of the oxygen sensor, and load a PWM heating signal through an H-pin to realize the PID closed-loop control of the working temperature. Therefore, the oxygen sensor signal simulation module must avoid the working temperature detection process of the sensor, when the sensor is in the temperature detection process, the IP voltage amplitude is very small, and the block diagram II controls the intervention and exit of the oxygen sensor simulation by screening the IP signal size. The yellow part constructs a circuit of a comparator, the IP pump current output signal is connected to the positive end of the comparator, and the negative end of the comparator divides the voltage through resistors R707 and R708 so as to provide an overturning reference voltage for the comparator. The part of the IP signal with the lower amplitude is screened out by the comparator module, and this part indicates that the sensor UN is operating in the temperature detection process. One path of output signals of the comparator directly controls the digital switch on the exit oxygen simulation route, and the other path controls the digital switch on the exit oxygen simulation route through the phase inverter. The block diagram II module can accurately realize that the oxygen sensor simulation exits when the UN is in the temperature detection process, intervenes in the oxygen sensor simulation when the pump oxygen current works, and quantitatively and directionally realize the deviation of the lambda value acquired by the gasoline controller and the real lambda value.
The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A wide-area oxygen sensor signal acquisition and signal simulation control unit is characterized by comprising a signal acquisition unit, a control unit and a signal simulation unit;
the input end of the signal acquisition unit is connected with the wide-area oxygen sensor and is used for acquiring the real signal of the engine acquired by the wide-area oxygen sensor;
the output end of the signal acquisition unit is connected with the input end of the signal simulation unit, and the output end of the signal simulation unit is connected to the gasoline controller and used for outputting a control simulation control signal;
the control unit is connected with the enabling end of the signal simulation unit and used for accurately and quantitatively offsetting the real signal of the engine, so that the output simulation control signal has an offset which is lean or rich compared with the real engine signal.
2. The wide area oxygen sensor signal acquisition and signal simulation control unit of claim 1, wherein the signal acquisition unit uses a linear sensor chip CJ125 as a control unit.
3. The wide-area oxygen sensor signal acquisition and signal simulation control unit of claim 2, wherein the control unit selects a single chip microcomputer as the processor, and the single chip microcomputer is selected to be MC9S12XET256 MAL.
4. The wide-area oxygen sensor signal acquisition and signal simulation control unit of claim 1, wherein the signal simulation unit comprises an enabling module, a sensor internal temperature detection and Nernst voltage process screening module, and a Nernst voltage simulation module;
the enabling module comprises a relay RLY3 for disconnecting the gasoline computer ECU and the wide-area oxygen SENSOR energy Steve voltage UN line, the gasoline computer ECU end is set as a UN _ ECU end, and the wide-area oxygen SENSOR energy Steve voltage UN line end is set as a UN _ SENSOR end;
pin 4 of the relay RLY3 is connected with the UN _ ECU end, pin 3 is connected with the UN _ SENSOR end, and pin 5 is connected with the temperature detection and Nernst voltage process screening module and the Nernst voltage simulation module in the SENSOR;
the No. 3 pin is connected with the No. 4 pin in an initial state, and a simulation function is not involved;
and after the simulation signal is enabled, the No. 4 pin is connected with the No. 4 pin, and the UN _ SENSOR end is connected with the UN _ ECU through the temperature detection and Nernst voltage process screening module in the SENSOR and the Nernst voltage simulation module to enter a signal simulation mode.
5. The wide-area oxygen sensor signal acquisition and signal simulation control unit of claim 4, wherein the nernst voltage simulation module is composed of an adder/subtractor and a DA chip;
the input end of the adder/subtractor is connected with the UN _ SENSOR end and the DA chip, and quantitative amplitude accumulation or decrement is carried out on the Nernst signal UN _ SENSOR;
the DA chip is used for setting the voltage value output by the DA chip, and the value is the value deviated from the Nernst signal UN _ SENSOR;
the adder/subtractor output is connected to pin No. 5 of the relay RLY 3.
6. The wide-area oxygen sensor signal acquisition and signal simulation control unit of claim 5, wherein the DA chip is used for setting the voltage value output by the DA chip in an SPI bus communication mode.
7. The wide area oxygen SENSOR signal acquisition and signal emulation control unit of claim 6, wherein digital switch U2 is connected in series between the UN _ SENSOR terminal and pin No. 5 of relay RLY 3;
and a digital switch U1 is connected between the output end of the adder/subtractor and the pin No. 5 of the relay RLY3 in series.
8. The wide area oxygen sensor signal acquisition and signal simulation control unit of claim 7, wherein the sensor internal temperature detection and nernst voltage process screening module comprises a comparator;
the positive end of the comparator is connected with the current output signal of the IP pump;
the negative end of the comparator divides voltage through a resistor R707 and a resistor R708 so as to provide a turnover reference voltage for the comparator;
the output end of the comparator is divided into two paths of outputs, one path of output is used for controlling the digital switch U2, and the other path of output sequentially passes through the inverter to control the digital switch U1.
9. The wide area oxygen sensor signal acquisition and signal emulation control unit of any one of claims 1-8, in which the engine true signal is the nernst voltage UN fed back from the wide area oxygen sensor.
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| CN111351901A (en) * | 2020-04-02 | 2020-06-30 | 昆易电子科技(上海)有限公司 | Sensor special working condition simulation device |
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