On-off control method for electric braking air compressor system by improving combined dryer

Abstract

The invention discloses an on-off control method for an electric braking air compressor system by improving a combined dryer, and belongs to the technical field of brake control of full electric vehicles. The on-off method is characterized in that an air pressure signal capable of reflecting a working state of the dryer is guided out to actuate a pressure switch by improving an air path structure inside a conventional combined dryer to control on and off of an electric braking air compressor by utilizing a pressure switch signal, so that synchronous control on on-off of the air compressor and unloading and purging actions of the dryer is realized, and therefore, the electric energy is saved, the working performance and the service life of the dryer are effectively guaranteed. In principle, the method realizes synchronization of the on-off of the electric braking air compressor and the unloading and purging actions of the dryer, has the advantages of being simple in structure, easy to implement, low in cost, reliable in performance and the like, and is especially suitable for various pure electric commercial vehicles and range-increasing type commercial vehicles, which adopt an air-pressure brake mode; and the method has an important engineering application value on improving and enhancing the reliability and the service life of an air pressure brake system.

Description

technical field [0001] The invention belongs to the technical field of brake control of pure electric vehicles, and in particular relates to a start-stop control method of an electric brake air compressor system using an improved combined dryer. Electric commercial vehicles and extended-range commercial vehicles. Background technique [0002] The brake air compressor of a traditional internal combustion engine vehicle using air pressure braking is usually driven by the internal combustion engine. When the pressure of the vehicle’s air storage tank reaches the highest set value, the internal combustion engine cannot be stopped due to driving needs, so it can only pass through the pressure regulating valve. The unloading device in the air compressor connects the output pipeline of the air compressor to the atmosphere for unloading, while the brake air compressor is still idled by the internal combustion engine, and at the same time the compressed air in the regeneration air st...

AI Technical Summary

Problems solved by technology

[0004] However, many electric brake air compressors for pure electric commercial vehicles and range-extended commercial vehicles on the market are often designed to install pressure sensors or pressure switches on the air storage tank, and use the signal of the pressure sensor or pressure switch to realize the air compressor. Since the pressure control point of the pressure sensor or pressure switch is often inconsistent with the unloading pressure control point of the pressure regulating valve in the combined dryer, it is easy to cause the start-stop of the air compressor and the unloading action of the dryer to be out of sync. , resulting in the following two adverse consequences: one is that the electric brake air compressor does not stop after the dryer unloads (while the dryer is purging), resulting in the electric brake air compressor idling and consuming electric energy in vain; The dynamic air compressor stops but the dryer does not purge. After a period of time, the active water-absorbing material of the dryer cannot be activated and is scrapped. At the same time, a large amount of water and oil are mixed into the brake system pipeline and valve parts, which reduces the Reliability and lifespan of the braking system

Aiming at the current problem that the start-stop control of the electric brake air compressor on the pure electric commercial vehicle and the range-extended commercial vehicle is not synchronized with the unloading and purging action of the dryer, this invention proposes an electric braking system using an improved combined dryer. Dynamic air compressor start and stop control method to overcome

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