Heavy truck electric appliance load driving device based on PWM control

Abstract

A heavy truck electrical apparatus load driving device based on PWM control comprises a microcomputer controller MCU1; the microcomputer controller MCU1 generates an adjustable duty ratio pulse signal PWM control strategy; a driving control module 2 executes the duty ratio pulse signal PWM control strategy and drives a power driving module 4; the power driving module 4 drives an electrical apparatus load 5; the power driving module 4 monitors the work state of the electrical apparatus load 5 and outputs the feedback state which is collected and transmitted to the microcomputer printer controller MCU 1 and the driving control module 2 by a state collecting module 3; the invention can prolong the service life of the heavy truck self electrical apparatus load, reduce the impact on the power system and improve the reliability of the heavy truck self electrical apparatus.

Description

technical field [0001] The invention belongs to the technical field of automotive electronics applications, in particular to a heavy-duty truck electrical load drive device based on a microcomputer controller (MCU) and an adjustable duty ratio pulse signal (PWM). Background technique [0002] For the automotive field that requires very high safety and reliability performance, under the traditional control method, the service life of body electrical loads such as lights, motors, and various solenoid valves has always been a bottleneck for heavy-duty trucks. The traditional control loop of the body electrical load is generally: from the power supply (generator + battery) to the fuse to the control switch to the electrical load (such as the lamp) to the ground (frame). [0003] This simple control method makes the service life of the electrical load very short, and the instantaneous impact on the power system is very large. Because the impedance of electrical loads, especially...

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Problems solved by technology

[0004] In the above-mentioned traditional control method, the working status of the electrical load cannot be detected, and a closed-loop model with protective functions cannot be formed. Therefore, when the electrical load is overloaded or short-circuited, the body wiring harness will quickly heat up, and in severe cases, it will cause a car spontaneous combustion accident.

And because the fuse is used in the front stage of this traditional control method, when the electrical load is overloaded or short-circuited, the fuse will be blown. If you drive at high speed at night, it is very likely to cause accidental traffic accidents.

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