Vehicle-mounted engine carbon deposition monitoring system
A monitoring system and engine technology, which is applied to engine components, machines/engines, mechanical equipment, etc., can solve the problems that the feedback voltage value of the oxygen sensor changes greatly, the periodic change frequency decreases, and the feedback voltage fluctuates. The effect of avoiding related failures and avoiding cumbersome processes
Active Publication Date: 2017-03-22
JILIN UNIV
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[0003] Experimental analysis shows that when the engine has a lot of carbon deposits, the carbon deposits continuously absorb and release fuel, which affects the adjustment cycle of the mixture, making the mixture change to a very lean and very rich level, and the change range of the feedback voltage value of the oxygen sensor Bigger, longer period
Taking Volkswagen as an example, under normal circumstances, the feedback voltage of the oxygen sensor changes between 0.3V and 0.7V, and its cycle will have 8 times of alternating maximum and minimum values within 10s. After carbon deposition, the feedback voltage fluctuation of the oxygen sensor becomes larger, for example, from the original 0.3V-0.7V to 0.2V-0.8V, and its cycle frequency will decrease
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[0034] The specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing:
[0035] refer to figure 1 , a vehicle engine carbon deposition monitoring system, the system includes: engine coolant temperature sensor, accelerator pedal position sensor, oxygen sensor, signal acquisition and processing unit, timer, AT89S51 single-chip microcomputer, indicator light or display screen, buzzer. Described engine coolant temperature sensor, accelerator pedal position sensor, oxygen sensor are all connected with signal acquisition and processing unit; Described signal acquisition and processing unit, timer, indicator light or display screen, buzzer are all connected with AT89S51 single-chip microcomputer .
[0036]The engine coolant temperature sensor is used to collect the engine coolant temperature information, and send the engine coolant temperature information to the AT89S51 MCU after being processed by the signal acquisition and pr...
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The invention belongs to the technical field of vehicle detection, and particularly relates to a vehicle-mounted engine carbon deposition monitoring system. The vehicle-mounted engine carbon deposition monitoring system is applicable to vehicle-mounted engine carbon deposition monitoring of a closed-loop electronic fuel injection automobile equipped with an oxygen sensor. A method comprises the steps that accelerator pedal position information, engine starting duration and accelerator pedal tread process duration information, engine coolant temperature information and oxygen sensor feedback voltage values are acquired, the engine carbon deposition conditions are analyzed and judged by an AT89S51 single-chip microcomputer, and early warning prompting is given out when the value of the engine carbon deposition degree is equal to the warning value. According to the vehicle-mounted engine carbon deposition monitoring system, monitoring and early warning of automotive engine carbon deposition are achieved through monitoring of feedback voltage changes of the oxygen sensor.
Description
technical field [0001] The invention relates to the technical field of automobile detection, in particular to an on-board engine carbon deposition monitoring system based on a closed-loop electronic fuel injection automobile oxygen sensor feedback voltage analysis method. Background technique [0002] Due to the influence of various factors such as fuel quality, road driving conditions, and driving habits of the driver, the car will always generate carbon deposits quickly or slowly during the running process. With the gradual increase of carbon deposits in the engine, the power of the engine And fuel economy gradually deteriorates, seriously affecting the overall performance of the car running. However, carbon deposits usually occur in engine injectors, valves, spark plugs, piston tops, throttle bodies, intake ports, EGR valves, etc., and these parts are often not easily observed. It is difficult for the driver to understand the carbon deposits in these parts. Only when the...
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IPC IPC(8): F02B77/08
CPCF02B77/083
Inventor 刘玉梅李战伦庄娇娇乔宁国周懿陈云张志远刘绪洪刘丽朱江
Owner JILIN UNIV