On-line tester of handheld wide-domain oxygen sensor

Abstract

The invention discloses an on-line tester of a handheld wide-domain oxygen sensor. The on-line tester of the handheld wide-domain oxygen sensor comprises a shell (1) and a power supply (2), wherein the shell is connected with an oxygen sensor plughole (3); a display screen (4) is mounted in the shell and is connected with a microcomputer control unit (5); one end of the microcomputer control unit is connected with a key switch (6); the other end of the microcomputer control unit is successively connected with an AD collector (7) and a differential control circuit (8); one end of the oxygen sensor plughole is connected with the microcomputer control unit; the other end of the oxygen sensor plughole is connected with a probe (9) of the wide-domain oxygen sensor to be detected. According to the on-line tester of the handheld wide-domain oxygen sensor, the display screen is capable of directly displaying the pump current, measurement voltage and air-fuel ratio value of the wide-domain oxygen sensor; the on-line tester is high in detection accuracy, simple and convenient to connect and plug, high in operation efficiency, visual in display and convenient to carry; the quality and the yield of the products are ensured.

Description

technical field [0001] The invention relates to an oxygen sensor for a vehicle, in particular to a test instrument for a vehicle wide-area oxygen sensor. Background technique [0002] At present, according to the signal characteristics of the vehicle oxygen sensor, it can be divided into: narrow-area (jump type) and wide-area (broadband) oxygen sensors. The narrow-band oxygen sensor can only detect whether the air-fuel ratio is rich or lean, or whether the fuel injection is too much or too little, but it does not know how rich or lean it is. The EFI system uses this signal to make the fuel injection amount richer Jump back and forth between lean and control the vehicle's air-fuel ratio to about 14.7, which is fine for general use. As emission monitoring becomes more and more stringent, wide-area oxygen sensors appear. Wide-area oxygen sensors can know the specific air-fuel ratio, that is, how rich or lean the fuel injected into the engine cylinder is, and the specific ratio...

AI Technical Summary

Problems solved by technology

[0004] The existing general detection instrument of the wide-area oxygen sensor is a test bench, which is large in size, high in weight, difficult to move, and inconvenient to carry and use. It is also impossible to randomly detect its semi-finished products on the production line of the oxygen sensor. Inspection brings inconvenience and cannot guarantee product quality and yield

Images