Drive control module for controlling motor and control method of drive control module

Abstract

The invention discloses a drive control module for controlling a motor and a control method of the drive control module. The drive control module comprises a cell, a relay for controlling the motor to start or stop and a single-chip microcomputer for controlling the relay to start or stop. The drive control module also comprises an external switch and a self-protection circuit. The external switch is arranged at the ground terminal of the relay; and the self-protection circuit comprises a NOT gate circuit, wherein the NOT gate circuit is provided with an input end, an output end and a power supply end. The power supply end is connected with the cell; the input end is connected with the output end of the relay; and the output end is connected with the external switch. The NOT gate circuit is preset with a high threshold. The NOT gate circuit controls the external switch to switch on or switch off after making a comparison between the output end voltage of the relay and the high threshold. With the technical scheme above, the self-protection circuit automatically disconnects the relay and the ground under the condition of short circuit, thereby guaranteeing a fuse and the control module not to be burnt out when motor wire bundle and cell wire bundle are contacted or intertwined.

Description

technical field [0001] The invention relates to the field of auto parts, in particular to a drive control module for controlling a motor. Background technique [0002] With the increasing requirements of users for the intelligence, automation and comfort of automobiles, automatic functions such as automatic lifting of windows, automatic folding of rearview mirrors, automatic retracting of fuel tank caps, etc. are widely used in modern automobiles, and these intelligent The realization of the functions requires the DC motor to drive the mechanical structure to realize. refer to figure 1 , which is a schematic diagram of the control and connection of the DC motor in the prior art. At present, the running switch of the DC motor is realized through the operation of the control module, and the control module is realized by the single-chip microcomputer in the module to control the relay switch. DC The motor is connected to the relay in the module through the in-vehicle wiring h...

AI Technical Summary

Problems solved by technology

At this time, because the on-resistance of the relay switch is very small, a large current will pass through the fuse and the relay, causing the fuse and the relay to burn out due to overheating, which will cause the entire motor function module to fail, and the car will have safety problems.

Since the control module stops working when the motor is locked, it is impossible to diagnose this fault and close the relay, so such problems can only be solved by replacing the fuse or the control module in the prior art

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