Method, device and equipment for diagnosing open-circuit fault of secondary coil of engine and medium

Abstract

The invention discloses a diagnosis method, device and equipment for an open-circuit fault of a secondary coil of an engine and a medium. The method comprises the following steps: acquiring a voltage at a pin of a primary coil of an engine, whereinwhen the voltage is larger than or equal to a preset voltage threshold value, the voltage is high voltage; counting the total duration of the high voltage appearing in an ignition period; and when the total duration is greater than or equal to a preset duration threshold value, determining the open-circuit fault of the secondary coil of the engine. According to the diagnosis method for the open-circuit fault of the secondary coil of the engine, whether the open-circuit fault occurs to the secondary coil or not can be judged only according to the voltage at the pin of the primary coil, and if the open-circuit fault occurs to the secondary coil, the torque output of the engine is limited in time, so that the effects of protecting the engine and improving the driving safety are achieved.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a diagnosis method, device, equipment and medium for an engine secondary coil open-circuit fault. Background technique [0002] The engine ignition system of modern automobiles collects sensor signals installed on different parts of the engine and the vehicle through the Electronic Control Unit (ECU), and selects the appropriate ignition energy to ignite the engine at the best time according to the operating conditions of the engine. The working principle of ignition is as follows: the micro control unit in the ECU outputs a control signal, turns on the driver stage switch, makes the battery charge the ignition coil, and turns off the driver stage switch to realize ignition after charging is completed. There are two ignition methods: external drive ignition and internal drive ignition. The former drive level switch is integrated in the ignition coil, and the latter drive level sw...

AI Technical Summary

Problems solved by technology

[0004] However, the engine fault diagnosis in the prior art does not enable the secondary coil open circuit fault detection function, so the state of the secondary coil circuit cannot be detected in time, so it cannot fully and accurately reflect the circuit state of the secondary coil and whether the coil ignition is normal

Images