Air pressure alarm method of commercial vehicle air brake system

Abstract

The invention relates to an air pressure alarm method for a commercial vehicle air brake system, comprising the steps of: obtaining the air pressure value of the front circuit, the air pressure value of the rear circuit, and the air pressure value of the parking circuit; The upper limit value of the normal pressure of the circuit and the lower limit of the normal pressure of the parking circuit are compared respectively; according to the comparison results, the output air pressure signal is too low, or the air pressure signal is normal, or the air pressure signal of the parking circuit is low, or the air pressure signal of the parking circuit is high. or high air pressure signal. The present invention adds monitoring and related alarm methods for the parking circuit, and also increases the judgment logic when the pressure limiting valve fails, so that when the pressure limiting valve and the parking circuit fail, it can make a correct judgment in time and give an alarm. The safety of driving has been greatly improved; the alarm method for complex situations caused by high-voltage faults has been added, and the occurrence of false alarms and missed alarms has been 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.

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