JPS5834265Y2 - Diesel car fast idling device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a fast idling device for a diesel automobile.

The idle link of a diesel car has a rotation speed of 50
The engine is maintained at 0 to 700 rpm, but starting when the engine is not warm may cause instability in the rotational state at 1st hour of a cold start, engine malfunction due to increased load when driving the cooler, engine stoppage, or fan low. It is widely known that rotation causes overheating.

Therefore, the above drawback can be solved by increasing the idle link rotation speed by the amount of the decrease described above, but if you do this,
When the engine is warmed up or when a cooler is used, the idling rotation speed becomes 700 to 900 rpm, resulting in an increase in fuel consumption.

For this reason, it is desirable for diesel vehicles to maintain the idling rotation speed in each state or to increase the speed when necessary. In response to a cold start signal, a pneumatic actuator is used to move the control lever of the fuel injection pump in the increasing direction to maintain a specified idling speed or increase the desired speed. The pneumatic actuator is controlled by applying a proportional output, or a step output in the case of the cooler 1 drive signal, to a pneumatically controlled transducer that is supplied to the pneumatic actuator.
In another embodiment of this invention, a solenoid valve is connected in parallel to the transducer, and a proportional output Colt start signal is applied to the transducer, and a step output cooler drive signal is applied to the solenoid valve to control the pneumatic actuator. This is what I decided to do.

Examples of this invention will be described below with reference to the drawings.

In FIGS. 1 and 2, the fuel injection pump 1 is a speaking type fuel injection pump, and the control bar 2 has a shaft 3 as a fulcrum, and the control bar 2 is rotated from the shaft 3 to a governor lever (not shown) in proportion to the amount of rotation. The injection amount of the fuel injection pump 1 is appropriately controlled by transmitting the force.

The control lever 2 is biased in the decreasing direction by a coil spring 4 provided around the shaft 3.The control lever 2 is formed with an engagement piece 5, and the engagement piece 5
is engaged with an output rod 7 of a pneumatic actuator 6.

The pneumatic actuator 6 uses positive pressure or negative pressure, and the tip of the output rod 7 is bent to form a bent part 8.
The bent portion 8 is connected to the engagement piece 5 of the control lever 2.
is engaged in.

The output rod 7 is fixed to a diaphragm 10 within a case 9, and the output rod 7 is displaced by air pressure (negative pressure in this embodiment) guided to an air pressure chamber 11 made up of the diaphragm 10 and the case 9. .

The pneumatic chamber 11 is connected to a pneumatic source 13 via a pipe 12, and a transducer 14, which is an electropneumatic converter, is provided in the middle of the pipe 12.

This transducer 14 converts and outputs air pressure proportional to the applied voltage.
Air pressure proportional to the voltage applied by 4 is guided into the air pressure chamber 11 of the pneumatic actuator 6, and the diaphragm 10 is displaced against the spring 15, so that the output lot 7 moves to the right by an amount proportional to the air pressure. , and the control lever 2 is moved in the increasing direction.

Therefore, the amount of injection from the fuel injection pump 1 is increased in proportion to the signal, and the amount of injection from the fuel injection pump 1 is increased in proportion to the signal.
The speed is increased from rpn to the required rotation speed.

The pneumatic actuator 6 is actuated by a cold start signal, a cooler, and a drive signal, and the cold start signal is detected by a semiconductor temperature sensing element 16 such as a thermistor based on the engine cooling water temperature, atmospheric temperature, fuel temperature, etc. The signal is detected from the current flowing to operate the electromagnetic clutch when the refrigerant compressor is driven, and is detected by, for example, providing a relay in the compressor drive circuit and closing the detection switch 17 via the relay.

A circuit consisting of a temperature sensing element 16, a detection switch 17, a transducer 14, etc. is shown in FIG. The set voltage to the one side input terminal of the proportional amplifier 21 is determined by the resistors 19 and 20, and the voltage applied to the + side input terminal is determined by the thermistor 16.
When the voltage becomes higher than the input terminal voltage on one side, it is outputted from the proportional amplifier 21 in proportion to the difference, amplified by the power amplifying transistor 22, and sent to the previously occupied transducer 14. It is something that is washed away.

Since the detection switch 17 is provided in parallel with the resistor 20 and is closed when the cooler is driven, the input terminal voltage on the side drops rapidly, and the proportional amplifier 21 becomes saturated and output.

In this way, at the time of a cold start, the speed increase signal is determined as appropriate based on the temperature difference that is the basis of the cold start signal, but when driving the cooler, the speed is increased by stepping a certain number of rotations during driving. It is something that

3 and 4, another embodiment of this invention is shown, whereas in the previous embodiment one transducer 14 was controlled by a cold start signal and a cooler drive signal by an electric circuit configuration. In this embodiment, a transducer 14 is provided in the pipe 12 connecting the pneumatic actuator 6 and the pneumatic source 13, and a solenoid valve 23 is provided in parallel to the transducer 14, so that the transducer 14 can be activated by a cold start signal. , and the solenoid valve 23 is controlled by a cooler drive signal.

That is, in the case of an electric circuit, the detection switch 17 is removed from the electric circuit shown in FIG.
A solenoid valve 27 is connected in series with the valve.

With this configuration, the cold start signal is detected by the temperature sensing element 16 such as a thermistor, applied to the transducer 14 by the proportional signal from the proportional amplifier 21, and proportionally controlled by the voltage applied to the transducer 14. This air pressure is supplied to the pneumatic actuator 6, and the control lever 2 of the fuel injection pump 1 is rotated by a certain amount in the increasing direction.

Further, when the cooler is driven, it is detected by the detection switch 17, and when the detection switch 17 is closed, the solenoid valve 23 is switched from closed to open, and the air pressure is supplied to the pneumatic actuator 6 bypassing the transducer 14, The control lever 2 of the fuel injection pump 1 is rotated in the direction of increasing the set maximum amount.

As mentioned above, this idea is to provide a fuel injection pump with an actuator that operates during idling, cold start, and drive of the cooler in a diesel vehicle, and provides proportional output to the actuator during cold start and when the cooler is running By applying a step output and rotating the control lever of the fuel injection pump in the increasing direction, the idling rotation speed can be increased or maintained above the specified rotation speed, and the engine can be prevented from malfunctioning. It is.

Furthermore, in this embodiment, since the actuator is actuated by a proportional output at the time of a cold start, uniform speed increases are also prevented from unnecessary speed increases, which also has the effect of improving fuel efficiency.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an embodiment of this invention, Fig. 2 is an electric circuit diagram of the same as above, Fig. 3 is a block diagram of another embodiment of this invention, and Fig. 4 is a block diagram of an embodiment of this invention.
The figure is an electrical circuit diagram of the same as above. DESCRIPTION OF SYMBOLS 1...Fuel injection pump, 2...Control lever, 6...Pneumatic actuator, 13...Pneumatic pressure source, 14...Transducer, 16...Temperature sensing element such as a thermistor, 17. ...detection switch that detects the cooler drive signal, 23... solenoid valve.

Claims (1)

[Claims for Utility Model Registration] 1. A pneumatic actuator is provided so that the control lever of the fuel injection pump can be moved in the direction of increasing speed, and a transducer is provided between the pneumatic actuator and the air pressure source. A fast idling device for a diesel automobile, characterized in that the transducer is actuated by a proportional output of a cold start signal and by a step output of a cooler drive signal. 2. A transducer and a solenoid valve are installed in parallel between the pneumatic actuator and the pneumatic source, and the trans juice is actuated by the proportional output of the cold start signal, and the solenoid valve is actuated by the step output of the cooler drive signal. A first eye link device for a diesel motor vehicle according to claim 1 of the utility model registration claim, characterized in that: