An early warning device capable of tracking front-end faults of vacuum brakes in automobiles

Abstract

The invention discloses an early-warning device capable of tracking a fault at the front end of a vehicle vacuum brake. The early-warning device comprises a body, a front end early-warning signal device (15), a tail end early-warning signal device (19) and an engine rotation speed pulse signal obtaining device (20). The body comprises a shell, a loudspeaker (6) arranged in the shell, and a circuit board (3) connected with the loudspeaker. The circuit board comprises a power source circuit, a control circuit, a voice circuit, a power amplifier circuit and a waveshaping circuit. The power source circuit provides two different voltages for the power amplifier circuit, the waveshaping circuit, the control circuit and the voice chip circuit through voltage reduction. The front end early-warning signal device and the tail end early-warning signal device are connected with the control circuit. The control circuit is connected with the voice circuit and the power amplifier circuit. By the adoption of the early-warning device, the effect that a vehicle has enough time to be processed with effective measures before the vehicle completely loses braking capacity can be guaranteed, safety of a driver and other personnel on the vehicle is guaranteed, and reliability and accuracy of early-warning can be guaranteed.

Description

technical field [0001] The invention belongs to the technical field of early warning of vacuum brakes of automobiles, and in particular relates to an early warning device capable of tracking front-end faults of vacuum brakes of automobiles. Background technique [0002] At present, the national diesel engine vacuum hydraulic brake car, the vacuum alarm device is the alarm light and buzzer on the car panel. When the engine is running or the vehicle is running, the alarm light is on, the buzzer sounds, and the alarm signal is normally closed. It means that there is a fault in the alarm; the alarm light is not on, the buzzer is not beeping, and the alarm signal is normally on, which is normal. The source of vacuum generation is that the vacuum pump on the automobile engine passes through the one-way valve to the vacuum box, and the fault alarm signal device is installed on the vacuum box. The vacuum in the vacuum box acts as a brake pressure when braking. The fault alarm annun...

AI Technical Summary

Problems solved by technology

The failure alarm annunciator plays an alarm role when the vacuum box breaks down, and the above-mentioned alarm technology has the following defects: defect 1: a, when the car is running, the keyway teeth of the front end drive shaft inside the vacuum pump collapse; b, the oil inlet pipe does not enter Oil; c. The oil return pipe does not return the oil; d. The fan belt is broken, so that the vacuum pump cannot operate and cannot work, resulting in no vacuum output

The failure of the front end of the above vacuum box can not alarm and prompt warning information, it will only alarm when there is no brake

Defect 2: When the car is running, such as the part (vacuum pump) that provides brake vacuum, when the vacuum is suddenly interrupted, due to the blocking effect of the one-way valve, there is still vacuum suction in the vacuum box at this time, and the support plate on the alarm signal is sucked. The live contact on the signal is still sucked down to break the circuit, so it cannot act as an alarm, and the driver cannot find abnormal warning information

[0003] According to the occurrence of the above-mentioned faults, some people hope that an early warning signal device can be installed before the vacuum box, such as a one-way valve, a vacuum pump, etc. However, the early warning signal device cannot be identified and is still in the normally closed state. The early warning signal device continues to give false alarms, which cannot achieve the reliability of the product, so it still cannot play the role of early warning.

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