CN112947361A - Vehicle-mounted emission fault monitoring system - Google Patents
Vehicle-mounted emission fault monitoring system Download PDFInfo
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- CN112947361A CN112947361A CN202110122982.1A CN202110122982A CN112947361A CN 112947361 A CN112947361 A CN 112947361A CN 202110122982 A CN202110122982 A CN 202110122982A CN 112947361 A CN112947361 A CN 112947361A
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- accelerator pedal
- position signal
- emission
- main controller
- pedal position
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0259—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterized by the response to fault detection
- G05B23/0262—Confirmation of fault detection, e.g. extra checks to confirm that a failure has indeed occurred
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24065—Real time diagnostics
Abstract
The invention provides a vehicle-mounted emission fault monitoring system, which comprises: the system comprises a CAN communication module, a main controller and an accelerator pedal position signal processing module; the main controller receives the emission fault information transmitted by the CAN communication module and identifies whether the fault code is an emission fault code; when the accelerator pedal position signal processing module receives the emission fault code, the accelerator pedal position signal is attenuated according to a certain proportion and then is sent to the engine ECU, so that the engine ECU controls the opening of a throttle valve according to the attenuated accelerator pedal position signal; when the accelerator pedal position signal processing module receives the non-emission fault code, the acquired accelerator pedal position signal is transmitted to the engine ECU, so that the engine ECU controls the opening of a throttle according to the accelerator pedal position signal. The position signal of the accelerator pedal received by the engine ECU in the fault state of the exhaust system is smaller than the position signal of the accelerator pedal in the normal state, so that the opening of a throttle valve is reduced, the power output of the engine is forcibly reduced, and the emission of pollutants is reduced.
Description
Technical Field
The invention relates to the technical field of fault monitoring, in particular to a vehicle-mounted emission fault monitoring system.
Background
At present, a gasoline engine exhaust system mainly performs closed-loop control on the air-fuel ratio of an engine through an oxygen sensor, so that the conversion efficiency of a three-way catalytic converter is improved, and pollutants discharged by an automobile are reduced. However, with the increase of the driving mileage of the automobile, the exhaust system has faults of exhaust pipe vibration, oxygen sensor aging, three-way catalyst failure and the like, so that the performance of the engine is affected, and the exhaust emission of the automobile is deteriorated. Although the automobile OBD (on Board diagnostics) diagnosis system can monitor the exhaust emission in real time, the faults have little influence on the dynamic property and the maneuverability of the vehicle, so that the vehicle with the fault exhaust system can still continue to run, the exhaust emission of the automobile is increased, and the effective control on the fault vehicle cannot be realized.
When the exhaust system breaks down, maintenance personnel need spend a large amount of time to detect the trouble and just can find out the position that produces the trouble, therefore has the problem that maintenance efficiency is low and detection maintenance cost is high.
Disclosure of Invention
The invention aims to provide a vehicle-mounted emission fault monitoring system to realize automatic monitoring of vehicle-mounted emission faults.
To achieve the above object, the present invention provides a vehicle-mounted emission fault monitoring system, including:
the CAN communication module is connected with the automobile OBD diagnosis interface and used for receiving emission fault information sent by the engine ECU through the automobile OBD diagnosis interface; the emission fault information comprises engine rotating speed, engine torque, throttle opening, an accelerator pedal position signal and a fault code;
the main controller is connected with the CAN communication module and used for receiving the emission fault information transmitted by the CAN communication module and identifying whether a fault code is an emission fault code;
the accelerator pedal position signal processing module is respectively connected with the engine ECU and the main controller;
when the accelerator pedal position signal processing module receives an emission fault code sent by the main controller, the accelerator pedal position signal is attenuated according to a certain proportion and then sent to the engine ECU, so that the engine ECU controls the opening of a throttle according to the attenuated accelerator pedal position signal;
when the accelerator pedal position signal processing module receives a non-emission fault code sent by the main controller, the acquired accelerator pedal position signal is transmitted to the engine ECU, so that the engine ECU controls the opening of a throttle according to the accelerator pedal position signal.
Optionally, the system further comprises:
the serial port module is respectively connected with the main controller and the Bluetooth module of the mobile terminal and is used for sending an acquisition instruction sent by the Bluetooth module of the mobile terminal to the main controller so that the main controller sends the emission fault information according to the acquisition instruction; the serial port module is also used for sending the emission fault information sent by the main controller to the Bluetooth module so as to display the emission fault information on the mobile terminal.
Optionally, the system further comprises:
and the USB conversion serial port module is respectively connected with the upper computer and the main controller and is used for transmitting the discharge fault information to the upper computer for displaying.
Optionally, the system further comprises:
the first power conversion module is connected with a 16 th pin of the automobile OBD diagnosis interface and used for directly obtaining the voltage of a vehicle storage battery through the 16 th pin, converting the voltage of the vehicle storage battery into 5V voltage and providing electric energy for the serial port module;
and the second power supply conversion module is respectively connected with the first power supply conversion module and the main controller and is used for converting 5V voltage into 3V voltage and providing electric energy for the main controller.
Optionally, when the master controller recognizes that the fault codes include the P00, P03 and P04 codes, the fault codes are emission fault codes and non-emission fault codes except the emission fault codes.
Optionally, the CAN communication module is connected with the automobile OBD diagnosis interface through a patch cord.
Optionally, when the engine ECU monitors a vehicle fault, the emission fault information is sent to the CAN communication module through the vehicle OBD diagnostic interface.
Optionally, an overheat protection circuit is disposed inside the first power conversion module, and when the output current is greater than 1A, the current is automatically limited.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a vehicle-mounted emission fault monitoring system, which comprises: the system comprises a CAN communication module, a main controller and an accelerator pedal position signal processing module; the main controller receives the emission fault information transmitted by the CAN communication module and identifies whether the fault code is an emission fault code; when the accelerator pedal position signal processing module receives the emission fault code, the accelerator pedal position signal is attenuated according to a certain proportion and then is sent to the engine ECU, so that the engine ECU controls the opening of a throttle valve according to the attenuated accelerator pedal position signal; when the accelerator pedal position signal processing module receives the non-emission fault code, the acquired accelerator pedal position signal is transmitted to the engine ECU, so that the engine ECU controls the opening of a throttle according to the accelerator pedal position signal. The position signal of the accelerator pedal received by the engine ECU in the fault state of the exhaust system is smaller than the position signal of the accelerator pedal in the normal state, so that the opening of a throttle valve is reduced, the power output of the engine is forcibly reduced, and the emission of pollutants is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a block diagram of a vehicle emission fault monitoring system of the present invention;
description of the symbols: 1. CAN communication module, 2, main control unit, 3, accelerator pedal position signal processing module, 4, serial module, 5, bluetooth module, 6, USB conversion serial module, 7, host computer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a vehicle-mounted emission fault monitoring system to realize automatic monitoring of vehicle-mounted emission faults.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in FIG. 1, the present invention discloses a vehicle-mounted emission fault monitoring system, comprising: the system comprises a CAN communication module 1, a main controller 2 and an accelerator pedal position signal processing module 3; CAN communication module 1 and car OBD diagnose interface connection, main control unit 2 with CAN communication module 1 connects, accelerator pedal position signal processing module 3 respectively with engine ECU with main control unit 2 is connected.
The CAN communication module 1 is used for receiving emission fault information sent by an engine ECU through the automobile OBD diagnosis interface; the emission fault information comprises engine rotating speed, engine torque, throttle opening, an accelerator pedal position signal and a fault code; specifically, CAN communication module 1 passes through the patch cord and diagnoses interface connection with car OBD, and OBD one minute two patch cords are selected to this embodiment patch cord, and patch cord one end articulate is connected to car OBD diagnosis interface, and one articulate is connected to CAN communication module 1 in the other both ends, and another connects as reserving and supplies other usage to use. In this embodiment, the vehicle OBD diagnostic interface is a diagnostic interface of a vehicle OBD system.
The main controller 2 is used for receiving the emission fault information transmitted by the CAN communication module 1 and identifying whether a fault code is an emission fault code; specifically, the discharge fault code is fixed to P00, P03, P04 in the first 3 bits in the OBD system, and when the main controller 2 recognizes that the fault code includes the P00, P03, and P04 codes, it is described that the fault code is a discharge fault code at this time, and is a non-discharge fault code except for the discharge fault code.
When accelerator pedal position signal processing module 3 receives the emission fault code that main control unit 2 sent, it is right accelerator pedal position signal sends for engine ECU after according to certain proportion decay to make engine ECU according to after the decay accelerator pedal position signal control throttle opening, reduce fuel injection system's fuel injection volume, reduce engine power output, thereby realize when having emission fault driver no matter how step on accelerator pedal, the engine can not output its hoped power, impel driver's compulsory maintenance vehicle.
When the accelerator pedal position signal processing module 3 receives the non-emission fault code sent by the main controller 2, the acquired accelerator pedal position signal is transmitted to the engine ECU, so that the engine ECU controls the throttle opening according to the accelerator pedal position signal. In the present embodiment, the vehicle-mounted computer of the engine is collectively referred to as an engine ECU.
As an embodiment, the system of the present invention further includes: the serial port module 4 is respectively connected with the main controller 2 and the Bluetooth module 5 of the mobile terminal, and is used for sending an acquisition instruction sent by the mobile terminal through the Bluetooth module 5 to the main controller 2 so that the main controller 2 sends the emission fault information according to the acquisition instruction; the serial port module 4 is also used for sending the emission fault information to the Bluetooth module 5 so as to display the emission fault information at the mobile terminal, so that maintenance personnel can conveniently check the emission fault information above the mobile terminal, and the maintenance time and the maintenance cost are saved.
That is, the serial module 4 essentially performs level conversion of logic signals between the main controller 2 and the bluetooth module 5.
The emission fault information is transmitted between the Bluetooth module 5 and the serial port module 4 of the mobile terminal in the form of a complete data frame, and a special communication protocol is formulated to identify the format of the processed data frame, so that the reliability and the integrity of the received and transmitted data are ensured. The frame head and the frame tail of the Bluetooth communication protocol are both expressed by one byte, and the American Standard Code for Information Interchange (ASCII) value 0 is used as a fixed frame head identifier, and the value 255 is used as a fixed frame tail identifier. The data is in hexadecimal form, the length range of the data is 0-255, and the data is two bytes in length. The data block ASCII code contains 0-9 and 24 capital letters, and the ASCII value range is 48-90. The data type is represented by one byte, where an ASCII value of 1 represents an OBD diagnostic system instruction and an ASCII value of 2 represents a designed supervisory system instruction.
As an embodiment, the system of the present invention further includes: and the USB conversion serial port module 6 is respectively connected with the upper computer 7 and the main controller 2 and is used for transmitting the emission fault information to the upper computer 7 for displaying so as to realize monitoring of the vehicle-mounted emission fault.
As an embodiment, the system of the present invention further includes: the first power conversion module is connected with a 16 th pin of the automobile OBD diagnosis interface, and the second power conversion module is connected with the first power conversion module and the main controller 2 respectively. The first power supply conversion module is used for directly obtaining the voltage of the vehicle storage battery through a 16 th pin, converting the voltage of the vehicle storage battery into 5V voltage and providing electric energy for the serial port module 4. The second power conversion module is used for converting 5V voltage into 3V voltage and providing electric energy for the main controller 2.
The input end and the output end of the first power supply conversion module are both provided with two filter capacitors to optimize the direct current characteristic of output voltage, an overheat protection circuit is arranged inside the first power supply conversion module, and when the output current is larger than 1A, the current can be automatically limited. And the input end and the output end of the second power supply conversion module are both provided with two filter capacitors to optimize the direct current characteristic of the output voltage.
Under the engine flameout state, the voltage value of the engine is 12-13V, and the voltage of the engine after the engine is started is generally 13.8-14.2V. Along with the change of the load of the electric equipment, the voltage fluctuation of the motor is obvious. A fuse is designed on a power circuit of an engine to prevent a vehicle storage battery from being damaged due to system failure. Meanwhile, a pi-type filter circuit is designed, so that the influence of voltage fluctuation of a vehicle storage battery on a system is avoided.
After the CAN communication module 1 in the vehicle-mounted emission fault monitoring system is connected with the vehicle OBD diagnosis interface, when an ignition switch is in an ON gear, the vehicle OBD diagnosis system automatically searches a matched communication protocol until normal OBD communication is established, enters a self-checking mode, and simultaneously completes initialization of the vehicle-mounted emission fault monitoring system. Once the engine ECU controls a fault Indicator lamp mil (map) on an automobile instrument panel to be turned on, it is described that a vehicle fault is monitored, at this time, the engine ECU sends the emission fault information to the CAN communication module 1 through the automobile OBD diagnostic interface, the main controller 2 identifies whether a fault code is an emission fault code, and when the accelerator pedal position signal processing module 3 receives the emission fault code sent by the main controller 2, the accelerator pedal position signal is attenuated according to a certain proportion and then sent to the engine ECU, so that the engine ECU controls the opening of a throttle valve according to the attenuated accelerator pedal position signal, the power output of the engine is reduced, and a driver is prompted to forcibly maintain the vehicle.
The embodiments in the specification are described in a progressive mode, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to assist in understanding the core concepts of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. An on-board emission fault monitoring system, the system comprising:
the CAN communication module is connected with the automobile OBD diagnosis interface and used for receiving emission fault information sent by the engine ECU through the automobile OBD diagnosis interface; the emission fault information comprises engine rotating speed, engine torque, throttle opening, an accelerator pedal position signal and a fault code;
the main controller is connected with the CAN communication module and used for receiving the emission fault information transmitted by the CAN communication module and identifying whether a fault code is an emission fault code;
the accelerator pedal position signal processing module is respectively connected with the engine ECU and the main controller;
when the accelerator pedal position signal processing module receives an emission fault code sent by the main controller, the accelerator pedal position signal is attenuated according to a certain proportion and then sent to the engine ECU, so that the engine ECU controls the opening of a throttle according to the attenuated accelerator pedal position signal;
when the accelerator pedal position signal processing module receives a non-emission fault code sent by the main controller, the acquired accelerator pedal position signal is transmitted to the engine ECU, so that the engine ECU controls the opening of a throttle according to the accelerator pedal position signal.
2. The on-board emission fault monitoring system of claim 1, further comprising:
the serial port module is respectively connected with the main controller and the Bluetooth module of the mobile terminal and is used for sending an acquisition instruction sent by the Bluetooth module of the mobile terminal to the main controller so that the main controller sends the emission fault information according to the acquisition instruction; the serial port module is also used for sending the emission fault information sent by the main controller to the Bluetooth module so as to display the emission fault information on the mobile terminal.
3. The on-board emission fault monitoring system of claim 1, further comprising:
and the USB conversion serial port module is respectively connected with the upper computer and the main controller and is used for transmitting the discharge fault information to the upper computer for displaying.
4. The on-board emission fault monitoring system of claim 2, further comprising:
the first power conversion module is connected with a 16 th pin of the automobile OBD diagnosis interface and used for directly obtaining the voltage of a vehicle storage battery through the 16 th pin, converting the voltage of the vehicle storage battery into 5V voltage and providing electric energy for the serial port module;
and the second power supply conversion module is respectively connected with the first power supply conversion module and the main controller and is used for converting 5V voltage into 3V voltage and providing electric energy for the main controller.
5. The vehicle-mounted emission fault monitoring system of claim 1, wherein when the master controller recognizes that the fault codes include the P00, P03 and P04 codes, the fault codes are emission fault codes and non-emission fault codes.
6. The on-board emissions fault monitoring system of claim 1 wherein the CAN communication module is connected to the vehicle OBD diagnostic interface via a patch cord.
7. The on-board emission fault monitoring system of claim 1, wherein when an engine ECU monitors for a vehicle fault, the emission fault information is sent to the CAN communication module through the automotive OBD diagnostic interface.
8. The on-board emission fault monitoring system of claim 4, wherein an overheat protection circuit is disposed inside the first power conversion module, and the current is automatically limited when the output current is greater than 1A.
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| CN202110122982.1A CN112947361A (en) | 2021-01-29 | 2021-01-29 | Vehicle-mounted emission fault monitoring system |
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| CN202110122982.1A CN112947361A (en) | 2021-01-29 | 2021-01-29 | Vehicle-mounted emission fault monitoring system |
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| DE102008032604A1 (en) * | 2008-07-11 | 2010-01-14 | Volkswagen Ag | Exhaust gas flow condition adjusting method for e.g. diesel engine of motor vehicle for desulfurization of catalysts, involves increasing or adjusting pressure gradient from diverging area to junction area |
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