Engine cooling module

Abstract

The invention provides an engine cooling module with fixed duty ratio. The engine cooling module comprises a motor, an impeller driven by the motor, and a speed control device connected in series between the motor and a motor power source. The speed control device comprises a high-speed branch and a low-speed branch connected in parallel, the low-speed branch is connected in series with a pulse width modulation circuit, and the pulse width modulation circuit reduces the average voltage with fixed duty ratio so as to make the motor rotate at low speed. By implementing the engine cooling module provided by the invention, the high-speed branch and the low-speed branch are combined into one to replace the traditional step-down resistor, the production cost is saved, and the power consumption is reduced.

Description

【Technical Field】 [0001] The invention relates to the field of automobile engine cooling, in particular to an engine cooling module with a motor and an impeller. 【Background technique】 [0002] The motor drive circuit of a traditional automobile engine cooling module has a high-speed branch and a low-speed branch connected in parallel. When the high-speed branch is turned on, the motor runs at high speed. When the low-speed branch is turned on and the high-speed branch is not turned on, the motor runs at low speed. Generally, the high-speed branch directly connects the power supply to an input terminal (such as the positive electrode) of the motor, and the low-speed branch realizes a step-down output by connecting a step-down resistor in series. In this way, when the motor rotates at a low speed, the step-down resistor will generate a lot of heat, resulting in greater loss. [0003] Those skilled in the art are aware that a pulse width modulation (PWM) circuit has the characteri...

AI Technical Summary

Problems solved by technology

However, because the PWM scheme has additional control circuits (such as circuits to adjust the duty cycle), the overall cost is significantly increased

In addition, the pulse width modulation (PWM) circuit uses a power supply branch to replace the traditional parallel high-speed branch and low-speed branch, and also has additional control terminals, which makes the interface of the engine cooling module using the PWM scheme incompatible with the traditional interface.

In the automotive field, different suppliers often provide different components, and the incompatibility of interfaces will seriously affect the sales scale of the engine cooling module of the PWM scheme, as well as the application occasions of the cooling module.

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