A air pressure alarm method for commercial vehicle air brake system

Abstract

The invention relates to an air pressure alarm method for a commercial vehicle air brake system. The method comprises the steps that a front loop air pressure value, a rear loop air pressure value anda parking and hanging loop air pressure value are obtained; respectively comparing with a service brake low-pressure alarm threshold value, a service brake high-pressure alarm threshold value, a parking and hanging loop normal pressure upper limit value and a parking and hanging loop normal pressure lower limit value; and outputting an over-low air pressure signal, or a normal air pressure signal, or a low air pressure signal of the parking and hanging loop, or a high air pressure signal of the parking and hanging loop, or an over-high air pressure signal according to the comparison result. According to the invention, monitoring and related alarm methods for the parking and hanging loop are added, and judgment logic for freaking down of the pressure limiting valve is also added, so that when the pressure limiting valve and the parking and hanging loop break down, correct judgment and alarm can be made in time, and the driving safety is greatly improved; an alarm method for complex conditions caused by high-voltage faults is added, and the situations of false alarm and missing alarm are greatly reduced.

Description

technical field [0001] The invention relates to the technical field of vehicle braking, in particular to an air pressure alarm method for an air brake system of a commercial vehicle. Background technique [0002] The brake system air pressure alarm will be displayed on the instrument panel in real time to remind the driver of the current safety status of the vehicle; for vehicles with an air brake system, the brake system air pressure alarm is a very important safety indicator. [0003] However, the current relevant laws and regulations only have requirements for low air pressure alarms, resulting in a very single alarm method; specifically, the existing brake system air pressure alarm method is: detect the air pressure value of the front circuit and the air pressure value of the rear circuit; The air pressure value of the front circuit and the rear circuit are compared with the artificially preset low pressure alarm pressure value; if at least one of them is lower than the ...

AI Technical Summary

Problems solved by technology

[0005] When the pressure limiting valve fails, it will mainly cause the air pressure of the parking circuit to be too low or too high; specifically: if the brake air pressure of the trailer is too low, it will cause insufficient braking performance of the trailer and the car cannot be braked; if the air pressure of the trailer If the air pressure is too high, and there is no reminder of the air pressure problem when the high air pressure alarm and the pressure limiting valve fail, it will cause damage to the relevant valves on the trailer

[0006] It can be seen from the above that the current simple alarm method causes mainstream OEMs to have only two air pressure sensors, and only monitors the driving air pressure; the disadvantage of this method is:

[0007] 1. The existing technology has not considered the judgment logic when the pressure limiting valve fails, and lacks the monitoring of the parking circuit and related alarm methods, so that when the pressure limiting valve and the parking circuit fail, it is impossible to make a correct judgment and call the police , affecting driving safety;

[0008] 2. The existing technology does not take into account the high-voltage failure caused by the large increase in brake air pressure, and the alarm method in complex situations resulting from this, resulting in false alarms and missed alarms.

Images