Electronic steering column lock control circuit and control method thereof

Abstract

The invention provides an electronic steering column lock control circuit and a control method thereof. The control circuit comprises a main MCU connected with a power supply circuit used for supplying power to an electronic steering column lock and diagnosing power supply, an auxiliary MCU connected with a ground supply circuit used for supplying ground to the electronic steering column lock and connected with a ground supply diagnosis circuit used for diagnosing ground supply, and a power feedback circuit used for controlling the output of the ground supply circuit according to whole vehicle power state feedback. By the adoption of the embodiment, the main MCU and the auxiliary MCU are arranged, so that power supply and ground supply of the ESCL are controlled, and safety is improved; the power feedback circuit is additionally arranged, so that it is guaranteed that the ESCL cannot normally work in a non-OFF power state, and it is guaranteed that the ESCL cannot be mistakenly triggered to be locked even under the condition that procedures of the main MCU and the auxiliary MCU run mistakenly; and in addition, the diagnosis circuit is arranged for power supply and ground supply, and power and ground cannot be output when it is diagnosed that a fault occurs.

Description

technical field [0001] The invention relates to the technical field of automobile electronics, in particular to an electronic steering column lock control circuit and a control method thereof. Background technique [0002] The one-key start system (PEPS) has been widely used in fuel vehicles. As a new option to replace the traditional ignition key and ignition lock, the driver only needs to press the start button or switch to complete the engine start. It is easy to operate, safe and stylish, more in line with the trend of intelligent automotive electronics, and has begun to be widely used in high-end cars at home and abroad. [0003] Electronic Steering Column Lock (ESCL), as part of the one-button start system, is installed on the steering column of the car to lock the steering column and lock the steering wheel to achieve the anti-theft function. However, ESCL is a double-edged sword. If it is not properly controlled, the following problems will occur: 1. It cannot be un...

AI Technical Summary

Problems solved by technology

However, ESCL is a double-edged sword. If it is not properly controlled, the following problems will occur: 1. It cannot be unlocked when it needs to be unlocked. Lock it when it needs to be locked. For example, if it is locked during driving and the steering cannot be turned, it is very likely to cause a car crash and death.

[0004] At present, most PEPS are controlled by a single MCU, and a single MCU cannot guarantee the redundant judgment of ESCL

And many of them are purely based on software strategies to ensure safety control. If the software runs away, there may be a danger of locking without needing to be locked. There is no solution to combine hardware circuits to ensure safety.

Images