Auxiliary braking overspeed warning method and device suitable for electronically controlled engines

Abstract

The invention discloses an assisted brake overspeed warning method and an assisted brake overspeed warning device applicable to an electric-control engine. The device comprises an ECU, a rotating speed sensor and an alarm, wherein the ECU comprises a first sensor, a second sensor, an OR gate, a first comparator, an AND gate, a delayer, an RS trigger, a second comparator, a first selecting switch, a third comparator, a second selecting switch, a fourth comparator, a third selecting switch, a fifth comparator, a fourth selecting switch, a signal trigger and a fifth selecting switch. The ECU disclosed by the invention can recognize a brake state, and after the rotating speed of the engine exceeds a limit value, the ECU emits a corresponding signal, and the signal is converted into an alarm signal which can be directly recognized by a driver via the alarm, thus reminding the driver of driving safely in engine braking, and therefore, potential safety hazards are prevented, and cost is lowered.

Description

technical field [0001] The invention relates to the field of engine auxiliary braking, in particular to an auxiliary braking overspeed warning method and device suitable for electronically controlled engines. Background technique [0002] After the engine auxiliary braking is activated, the engine is driven by the inertial force and gravity of the vehicle, and the speed will increase accordingly, even exceeding the speed that the engine can bear. Regardless of whether it is a mechanical pump diesel engine or an electronically controlled diesel engine, the engine fuel system will automatically stop injecting fuel. If the speed continues to rise, the driver can only rely on the driver to actively step on the brakes to reduce the speed of the vehicle, thereby reducing the engine speed. But this mainly depends on the driver's experience and willingness, and there are potential safety hazards. Some of the existing technologies reduce the speed by limiting the fuel injection, but...

AI Technical Summary

Problems solved by technology

But this mainly depends on the driver's experience and willingness, and there are potential safety hazards

Some of the existing technologies reduce the speed by limiting the fuel injection, but they are not suitable for the engine anti-drag state, because the fuel injection has already been stopped during braking; The overspeed limits are not uniform, nor can they play a due role in helping the driving safety under the state of engine-assisted braking; some need to use more special control components, resulting in higher costs

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