Fault diagnosis circuit of automotive oxygen sensor heater
An automobile oxygen sensor and fault diagnosis technology, which is applied in the direction of instruments, measuring electricity, and measuring electrical variables, etc., can solve problems such as failure of the oxygen sensor and difficulty in reaching the working temperature of the oxygen sensor, and achieve the effect of saving drive ports
Inactive Publication Date: 2010-09-15
北京锐意泰克汽车电子有限公司
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Problems solved by technology
Therefore, when the resistance wire of the heater is ablated, it is difficult for the oxygen sensor to reach the normal working temperature, thus losing its function
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[0009] The fault diagnosis circuit of the automobile oxygen sensor heater that the present invention proposes, its circuit diagram is as figure 1 As shown, including the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4 and the capacitor R0; the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 One end is connected together; the other end of the first resistor R1 is connected to the drive signal output end of the automobile oxygen sensor heater; the other end of the second resistor R2 is connected to the fault diagnosis circuit power supply; the third The other end of the resistor R3 is connected to one end of the capacitor C0, and the connected common end is grounded; the other end of the fourth resistor R4 is connected to the other end of the capacitor C0, and the connected common end is the output end of the diagnostic signal Vdiag of the fault diagnosis circuit .
[0010] According to the cha...
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The invention relates to a fault diagnosis circuit of an automotive oxygen sensor heater and belongs to the technical field of automotive electronics. In the diagnosis circuit, one end of a first resistor R1, one end of a second resistor R2, one end of a third resistor R3 and one end of a fourth resistor R4 are connected; the other end of the first resistor R1 is connected with a drive signal output end of the automotive oxygen sensor heater; the other end of the second resistor R2 is connected with a power supply of the fault diagnosis circuit; the other end of the third resistor R3 is connected with one end of a capacitor C0 and the public end of the connected the resistor R3 and capacitor R0, which are connected, is grounded; and the other end of the fourth resistor R4 is connected with the other end of the capacitor C0, and the public end of the connected fourth resistor R4 and capacitor R0, which are connected, serves as the diagnosis signal Vdiag output end of the fault diagnosis circuit. The fault diagnosis circuit of the invention can realize the diagnosis of three faults including power supply short circuit, short circuit to earth and open circuit. Thus, the drive of the oxygen sensor heater is not limited to the drive chips with a diagnosis function, and the drive ports of the system are saved.
Description
technical field [0001] The invention relates to a fault diagnosis circuit for an automobile oxygen sensor heater, which belongs to the technical field of automobile electronics. Background technique [0002] With the development of the automobile industry, the problem of environmental pollution caused by automobile exhaust is becoming more and more serious. In order to effectively control automobile exhaust and reduce emission pollution, most automobiles are equipped with a three-way catalytic converter in the engine exhaust system to purify exhaust gas. However, once the air-fuel ratio (hereinafter referred to as A / F) deviates from the theoretical value (14.7:1), the purification ability of the three-way catalyst to exhaust will drop sharply. Therefore, an oxygen sensor is installed in the exhaust pipe of the automobile, and the air-fuel ratio is measured according to the oxygen concentration at the exhaust port, and the signal of the oxygen sensor is fed back to the autom...
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IPC IPC(8): G01R31/00G01R31/02
Inventor 汤贵秋赵小娜
Owner 北京锐意泰克汽车电子有限公司