The way to protect the engine and the device for its realization

 

(57) Abstract:

The invention relates to automatic control of engines, in particular to the means for automatic protection of diesel engines in case of emergency situations at the time of their start. Way motor protection is that in the process of starting measure the frequency of rotation of the shaft, above her critical values include an actuator overlying the fuel in the fuel line of the engine, while achieving the shaft since the beginning of the rotation frequency from 1.0 to 50% of the frequency of rotation of idling of the engine shutting off the fuel supply in the fuel line of the engine, control the development process start by measuring the peak of the casting speed and comparing it with the limiting value of the cast, after which, respectively, include or not include the fuel in the fuel line of the engine. The motor protection device contains a sensor shaft speed of the motor, the frequency Converter of rotation of the shaft into an electrical signal, first, second and third of the comparison circuit, the logical circuit And the actuator, the fuel line of the engine and trigger circuit. The technical result is to increase nausicca to the automatic control of motors, in particular to means for automatic protection of diesel engines in case of emergency situations at the time of their start.

Known remedies of the engine in case of emergency situations at the beginning of engine operation, for example, on the author's certificate of the USSR 1477922 that contain the gauge of frequency of rotation of the motor shaft, a group of threshold sensors to turn off the engine, frequency converters rotation into electrical signals, switches and logic circuits forming algorithm enable and disable the actuator regulating the supply of fuel in the fuel line of the engine. In the process of starting the engine, measure the frequency of rotation of the shaft, while exceeding its critical value include an actuator overlying the fuel in the fuel line of the engine. This is a technical solution for implementing a device is rather complicated.

More simple and the closest to the technical nature of the claimed that implements the same way, is the technical solution under the author's certificate of the USSR 646138. The device includes a sensor shaft speed of the engine, the output of which cereal, a differentiating circuit, a first comparison circuit, the first input of the logic circuit And the first input of logic circuit OR connected to the input of the actuator, the fuel line of the engine, so the speed sensor of the motor shaft to its output simultaneously connected through a second inverter of rotation of the shaft into an electrical signal and a second comparison circuit with the second input of the logic circuit And to the second input of the logic OR.

The disadvantage of this technical solution is the low reliability of engine protection, because it does not allows to distinguish emergency mode from the normal development of the start-up process.

The objective of the invention is to improve the reliability of engine protection from emergency situations during start-up.

This is achieved by way of protection of the engine, wherein the start-up process is to measure the frequency of rotation of the shaft, while exceeding its critical value include an actuator overlying the fuel in the fuel line of the engine, characterized in that upon reaching the shaft since the beginning of the rotation frequency from 1.0 to 50% of the frequency of rotation of idling of the engine shutting off the fuel supply in toplin and comparing it with a limit of neglect after which, respectively, include or not include the fuel in the fuel line of the engine.

The essence of the proposed method is illustrated by device functional diagram of which is represented in the drawing.

The motor protection device contains a sensor 1 shaft speed of the engine, the output of which is included at the input of the Converter 2 frequency of rotation of the shaft into an electrical signal. The inverter output 2 frequency of rotation of the shaft into an electrical signal in parallel connected inputs of the first, second and third schemes comparison 3, 5 and 4. The first output of the comparison circuit included in one of the inputs of the trigger circuit 6, the output of which is included at the input of the actuator 7, the fuel line of the engine. To another input of the trigger circuit 6 includes an output logic circuit And 8, the inputs of which are incorporated respectively outputs the second 5 and third 4 schemes comparison. When you start working engine, the device operates as follows. In the process of starting the engine sensor 1 frequency of rotation of the motor shaft produces a signal proportional to the rotational speed of the motor shaft. This signal is applied to the input of the Converter 2 frequency of rotation of the shaft into an electrical signal. When dostijeniyami idling), triggered scheme 3 comparison output signal which switches the trigger circuit 6, an output signal which includes the actuator 7, overlying the fuel line of the engine.

Since the fuel line is saved fuel, the starting process of the engine continues. When he reached the peak of the Overspeed when starting, the engine goes to idle mode. After passing the values of the maximum casting speed at which the acceleration of the shaft becomes equal to zero, there is a triggering circuit 4 comparison signals through logic And 8 switches the trigger circuit 6, which in turn disables the actuator 7, which opens the fuel in the fuel line of the engine.

In the case of starting the engine with pre-crash situation the inclusion of the actuator 7, which disables the fuel supply to the engine is the same as that described above, but in the future when the limit is reached, the casting speed of the engine fires figure 5 comparison, the output of which through logic And 8 blocks the signal from the circuit 4 comparison to the input of the trigger circuit 6, thus preventing disconnection of the line is high reliability motor protection from emergency situations during start-up. The invention allows to react to the emergency situation in the process of starting and ensures the termination of the fuel supply in case of failure of the control circuit of the fuel supply.

1. The way to protect the engine, wherein the start-up process is to measure the frequency of rotation of the shaft, while exceeding its critical value include an actuator overlying the fuel in the fuel line of the engine, characterized in that upon reaching the shaft since the beginning of the rotation frequency from 1.0 to 50% of the frequency of rotation of idling of the engine shutting off the fuel supply in the fuel line of the engine, thus controlling the development process, start by measuring the peak of the casting speed and comparing it with the limiting value of the cast, after which, respectively, include or not include the fuel in the fuel line of the engine.

2. The motor protection device containing the sensor shaft speed of the motor, the frequency Converter of rotation of the shaft into an electrical signal, whose input is connected to the sensor output shaft speed of the engine, the first comparison circuit, a second comparison circuit, a logic circuit And the first input of which is connected to the historical signal and an actuator fuel line of the engine, characterized in that it is provided with a third comparison circuit and the trigger circuit, the output of which is included at the input of the actuator, the fuel line of the engine, the first input of a trigger circuit connected to the first output of the comparison circuit, the second input of a trigger circuit connected to the output of the logic circuit And the second input of which is connected to the third output of the comparison circuit and the inputs of the first and third circuits comparisons included in parallel with the second input of the comparison circuit to the Converter output shaft rotation into an electrical signal.

 

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