JPS611862A - Everytime injection gauge - Google Patents

Abstract

PURPOSE:To simplify fixing and handling of an everytime injection gauge and to reduce the manufacturing cost by providing a computor for operating the injection on the basis of the output signals from a solenoid valve for discharging fuel from a container, a pressure gauge and a trigger pulse generator. CONSTITUTION:Upon injection of fuel through a fuel injection valve 3, the pressure in a volume chamber 2 will increase. It is detected through a pressure pickup 5 and fed to a microcomputor 12. While signals from a trigger pulse generator 10 are fed to a solenoid valve controller 11 and the microcomputor 12. Said controller 11 will open a solenoid valve 4 after elapsing predetermined time to discharge fuel from the volume chamber 2 and close said valve 4 after elapsing predetermined time. Upon opening of said valve 4, discharge will occur when exceeding over the setting pressure of a backpressure regulation valve 7 to return to the initial condition. Consequently, fixing and handling of an everytime injection gauge are simplified while the manufacturing cost can be reduced.

Description

[Detailed description of the invention] The present invention relates to a fuel injection meter.

Figure 1 shows the structure of a conventional mechanical injection quantity meter. In the figure, 01 is a volume chamber filled with injected fuel.O2 is a pressure big amplifier that outputs pressure changes in the volume chamber 1 as a voltage value via an amplifier (not shown). 03 is the release valve, 04 is the protrusion rod, 05 is the cam, 0
Reference numeral 6 designates a drive gear that rotates in synchronization with a fuel amplifier (not shown). 07 is a fuel injection valve, which is shown in the figure, and high-pressure fuel is injected through a fuel amplifier and an injection pipe.

The fuel amplifier and cam 05 are driven in synchronization.

Shortly before the pump starts discharging, the cam rises to increase the opening pressure of the discharge valve. (It's something that won't open. After that, the fuel pump starts compressing and discharging the fuel, and the fuel is injected into the volume chamber from the fuel injection valve through the injection pipe. At this time, the volume chamber is filled with fuel oil.

A pressure increase occurs commensurate with the amount of injected firing material.

This pressure increase can be recorded with an onrograph, etc., and the injection amount can be calculated from the recorded amount.The opening pressure of the discharge valve is kept high until the injection is completed, and then the opening pressure of the discharge valve is increased by lowering the cam. is lowered and the fuel oil in the volume chamber is released. By repeating this cycle, the amount of injection each time can be determined.

The above-mentioned devices have drawbacks such as being complicated in structure, having a large number of parts, being expensive, needing to be driven in synchronization with the fuel pump, and requiring driving torque.

Further, even though the injection amount can be known each time, it is necessary to read the amount of change from an oscilloscope or the like and perform calculations, and there is a major drawback that the injection amount cannot be immediately known.

The purpose of the present invention is to focus on the above-mentioned points, and to provide an injection amount meter that is easy to install and handle, has low manufacturing costs, and that displays the amount of injection immediately. A filled container and a device for injecting fuel from a fuel pump into the container.

A pressure gauge that measures the pressure inside the container, a device that discharges the fuel in the container using a solenoid valve, a device that generates a reference pulse of one pulse per rotation by the rotation of the fuel pump camshaft, and the same device. A controller for the electromagnetic valve to which the Norse signal is input, and a converter to which the output signal of the pressure gauge and the pulse signal are input to calculate the penetration amount.

In this case, the fuel is released and the valve is opened using a solenoid valve, and the pressure change that occurs within the volume is converted into a digital value at each specified angle during a specified angle, and
It then performs calculations to calculate the injection amount, which can then be displayed immediately.

The present invention can be applied to any device that measures the amount of liquid that is intermittently discharged each time.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is an explanatory diagram showing an every-time injection amount measuring device according to an embodiment of the present invention.

In the figure, 1 is a main body, and a volume chamber 2 is located inside the main body. 3
is a fuel injection valve, and 4 is a solenoid valve. 5 is a pressure start-up, and 6 is a pressure signal amplifier.

7 is a back pressure regulating valve body, 8 is a valve, and 9 is a valve spring.

Reference numeral 10 denotes a trigger pulse generator synchronized with the rotation angle of a fuel pump camshaft (not shown), 11 a controller for the solenoid valve 4, and 12 a microcomputer.

Has arithmetic functions and clock signal generation functions. 13 is a display meter.

FIG. 4 shows the components of the microcombeater. A
/D converter, clock signal generator 2 rotation speed calculator r
N1 + N2 calculator, injection amount calculator, D/A
Consists of a converter.

The operation in the case of the above configuration will be described.

First, in the initial state, the volume chamber 2 is filled with fuel, and the solenoid valve 4 is in a closed state. At this time, when fuel is discharged by rotation of a fuel pump (not shown), the fuel can be completely injected from the fuel injection valve 3.

Then, the pressure of the fuel within the volume chamber 2 increases in proportion to the injected amount. If this is detected by the pressure start-up 5 and amplified by the pressure signal amplifier 6, the pressure rise can be detected at the same time as the injection, as shown in FIG. 3(c). This output signal is input to the microcomputer 12, and the pulse generator 10 generates a reference trigger pulse of one pulse per rotation. This trigger signal is transmitted to the solenoid valve controller 11 and the microcomputer 12.
is input to. The solenoid valve controller 11 opens the solenoid valve 4 after Δt1 time set from the reference signal.

The fuel injected into the volume chamber 2 is discharged, and the chamber 2 is further closed after Δt2 hours. When the electromagnetic valve 4 opens, the discharge occurs when the pressure exceeds the set pressure of the back pressure regulating valve 7, and the initial state is returned again.The operation of the microconbeater will be explained with reference to FIG.

The pressure signal from the amplifier, ie, the pressure signal amplifier, is provided in the converter, and the pressure signal is digitalized every minute time by the signal transmitter (A/D conversion).

In addition, the trigger release means that the rotational speed of the camshaft is calculated using a clock signal (rotation speed calculation unit). Nl is preset according to the number of rotations.

N2 is specified (NI N2 calculation), and N2 is specified from the trigger signal.
The injection amount is calculated based on the average value between 1 pulse and n pulses and the average value between N2A' pulses and n pulses, and 1 display meter 1
3. The injection amount value is also D/A converted and output as an analog value.

The above case has the following effects.

As mentioned above, by releasing and closing the fuel using a solenoid valve, there is no need to drive it in synchronization with the fuel pump.
Handling becomes very easy. It still has a small number of parts and is easy to manufacture, making it very inexpensive.

By instantly calculating the injection amount using a microcomputer and displaying it, the injection amount can be known at the same time as the engine is being operated, greatly speeding up work such as adjusting the injection amount.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a conventional injection amount meter, FIG. 2 is an explanatory diagram showing an embodiment of the injection amount measuring device according to the present invention, and FIG. Diagram showing rotation angle, volume chamber pressure, needle valve lift, and injection pressure. Fig. 4 is an explanation showing the operation of microcomputer configuration 1. Mf A6-2...Volume chamber, 3...Fuel injection Valve, 4... Solenoid valve, 5... Pressure kick-up, 10... Trigger pulse generator, 11... Solenoid valve controller, 12...
・Microcomputer. 10 Procedural amendment (voluntary) September 28, 1981

Claims (1)

[Claims] 1. A container filled with liquid, a device for injecting fuel from a fuel pump into the container, a pressure gauge for measuring the pressure inside the container, and a device for discharging the fuel in the container using a solenoid valve. ,
A device that generates a reference trigger pulse of one pulse per rotation by the rotation of the fuel pump camshaft, a controller for the solenoid valve to which the pulse signal of the device is input, and an output signal of the pressure gauge and the trigger pulse signal to be input. and a computer that calculates the injection amount.