Failure switching and alarming circuit for emergency stopping solenoid valve loop of diesel engine and method of failure switching and alarming circuit

Abstract

The invention discloses a failure switching and alarming circuit for an emergency stopping solenoid valve loop of a diesel engine and a method of the failure switching and alarming circuit. The failure switching and alarming circuit comprises the emergency stopping solenoid valve loop in series connection with an undercurrent detecting current relay and an overcurrent detecting current relay, an emergency stopping standby solenoid valve loop, an emergency stopping solenoid valve overcurrent switching control loop, an emergency stopping solenoid valve undercurrent switching control loop, a supply relay for switching a stopping power supply to a standby power supply when failure of the stopping power supply is detected and a stopping power supply power-losing, emergency stopping solenoid valve overcurrent and emergency stopping solenoid valve undercurrent alarming loop. The method comprises the steps that when the stopping power supply loses efficacy, the stopping power supply is directly switched to the standby power supply for power supplying; an emergency stopping solenoid valve is switched to a standby solenoid valve for emergency stopping when the emergency stopping solenoid valve is in overcurrent or undercurrent during emergency stopping; the emergency stopping solenoid valve loop is cut off for protection during overcurrent of the emergency stopping solenoid valve; and during the non-emergency stopping period, if an overcurrent alarming lamp still lights, not only is overcurrent of the emergency stopping solenoid valve loop shown, but also a switching module controlling the emergency stopping solenoid valve loop loses efficacy and is in short circuit.

Description

technical field [0001] The invention belongs to the technical field of diesel engine safety protection, and in particular relates to a diesel engine emergency stop electromagnetic valve circuit failure switching, an alarm circuit and a realization method thereof. Background technique [0002] At present: the emergency stop system of diesel engine has two ways of cutting off gas and cutting off oil for emergency stopping of diesel engine. An oil cut-off electromagnetic control valve device is installed on the oil circuit, and the oil can be cut off in an emergency when a fault occurs. These solenoid control valves are commonly referred to as emergency stop solenoid valves. When the solenoid valve used in the emergency stop solenoid valve is a normally closed solenoid valve, the designed circuit of the emergency stop solenoid valve is a demagnetized (power-off) stop; when the solenoid valve used in the emergency stop solenoid valve is a normally open solenoid valve The desig...

AI Technical Summary

Problems solved by technology

It seems that the above functions have been realized, but in addition to the existing problems and defects of a diesel engine emergency stop solenoid valve loop failure alarm circuit and its alarm method with the patent application number: 201510846141.X, there is also a diesel power supply for the alarm light The electricity generated by the engine is directly powered, and the warning light indicator cannot be seen after the emergency stop of the diesel generator, because when controlling the emergency stop of the diesel generator, the user cannot stare at the warning light, only after the emergency stop will pay attention to the warning light Indicates the status, but the diesel generator does not generate electricity after an emergency stop, so why is there power output

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