JPS6085327A - Apparatus for measuring quantity of fuel injection - Google Patents

Abstract

PURPOSE:To make the constitution simple and to make the cost low, by computing the amount of fuel injection based on the pressure in a fuel container, determining the opening time of a discharge valve based on the computation, and delaying the operating signal of the discharge valve later than the starting time of the fuel injection. CONSTITUTION:A fuel injection valve 2 injects the fuel into a fuel volume chamber 1. An electromagnetic valve 7 discharges the fuel in the fuel volume chamber 1. The pressure in the fuel volume chamber 1 is detected by a pressure pickup 6. The detected signal is inputted to a control device 8 through an amplifier 11. The control device 8 computes the amount of fuel injection from the fuel injection valve 2, determines the opening time of the electromagnetic valve 7 based on the result of computation, delays the operating signal of the electromagnetic valve 7 later than the starting time of the fuel injection of the fuel injection valve 2 by a specified time, and outputs the result.

Description

[Detailed description of the invention] This invention relates to a jet slug measuring device.

Generally, diesel engines have diagrams showing each injection of fuel,
Reference numeral 1 in the figure is a fuel volume chamber. This fuel volume chamber 1 is filled with high-pressure fuel injected from a fuel injection valve 2, and is discharged to the outside by a discharge valve 3. ”2 The discharge valve 3 is connected to the cam machine via the thrust rod 4:
# It is opened and closed by s. Note that the cam mechanism 5 is driven in synchronization with a fuel pump (not shown) that supplies fuel to the fuel injection valve 2.

Further, within the fuel volume chamber 1, a pressure regulator 6 is provided. This pressure binokup 6 is the fuel volume chamber 1
The amount of fuel injected from the fuel injection valve 2 is detected by detecting the pressure inside the fuel injection valve 2. That is, if the pressure increase value in the fuel volume chamber 1 detected by the pressure pickup 6 is ΔP (kg/z2), then the fuel injection ikQ (cm2) from the fuel injection valve 2 is calculated by the following equation.

ΔP = E Q/v ft frl L, E: bulk modulus of fuel (kg/cr
n2) V: Volume of the fuel volume chamber (cm) The fuel injection amount measuring device with such a configuration is as follows./Thus, the fuel pump and the cam 4'M 4i75 are synchronously jy
l, 7. I'll be working, but... Pump discharge! jJ) Made!
/6 a little 1) At 11, the cam mechanism 5 rises to -1 and the opening pressure of the discharge valve 3 is set to -1.In addition, when the valve opens in this case, the fuel injection is 14. 2 to 1!7 [The injected fuel is set so that the valve will not open even if the J'E force in the fuel volume chamber 1 becomes high. When the compressed discharge from the fuel pump is increased and the fuel is injected into the fuel volume chamber 1 through the fuel injection valve 2, 11C (Ω) is applied to the fuel volume chamber 1. Since the fuel oil CtH is used, a pressure rise occurs corresponding to 1 yen of the injected fuel, and this is detected by pressure surprise 6 and L. fuel injection valve 2
The empty fuel injection is complete! Then, the cam mechanism 5 descends and the valve opening pressure of the discharge ( ) f.3 is increased by F. As a result, the discharge valve 3 is opened by the pressure in the volume chamber 1, and the fuel in the volume chamber 1 is discharged until the set pressure is reached. By repeating this cycle, the amount of fuel injected is increased each time.

By the way, such a conventional fuel injection amount measuring device opens and closes the discharge valve 3 and uses the same LJI L cam mechanism 5 as the fuel pump, so the structure is complicated, and the disadvantage is that it has a large number of parts and is expensive. was there.

The present invention has been made to eliminate the above-mentioned drawbacks, and its purpose is to provide a fuel injection amount measuring device that has a simple structure and is inexpensive to produce.

In order to achieve the above objects, the present invention provides a fuel injection valve that injects fuel into a fuel volume chamber, a discharge valve that discharges fuel within the fuel volume chamber, and a pressure sensor that detects the pressure within the fuel container. Bi, quano and the detection of this pressure vino quanozo 46
Calculate the fuel injection amount of the above fuel injection valve based on the number q, shi,
A control device is provided which determines the opening time of the discharge valve from the reduction result and outputs the operation of the discharge valve with a delay of 7 hours from the injection start time of the fuel injector. It is characterized by the fact that

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 2 is a diagram showing an embodiment of the present invention, in which the same or corresponding parts as in FIG. 1 are given the same reference numerals. In the figure, reference numeral 7 denotes an electromagnetic valve serving as a release valve for releasing fuel in the fuel volume chamber 1, and this electromagnetic valve 7 is controlled by a control device 8. This control device 8 controls the fuel injection valve 2 based on the detection signal from the pressure valve 7'6.
The fuel injection iQ is calculated, and the opening time ΔT2 of the % magnetic valve 7 is determined from the calculated value. Then, the activation signal of the solenoid valve 7 is transmitted for a predetermined time ΔT1 from the injection start time of the fuel injection valve 2.
It is sent to the solenoid valve 7 with a delay. In addition, the reference numeral 9 in the figure is a back pressure regulating valve provided at the outlet end of the discharge passage 1°.

Next, the operation of this embodiment configured as described above will be explained with reference to FIG. First, in an initial state, the fuel volume chamber 1 is filled with fuel at a constant pressure, and the solenoid valve 7 is in a closed state. When fuel is injected from the fuel injection valve 2 in this state, the pressure within the first combustion chamber rapidly rises in proportion to the injection amount, as shown in FIG. Pressure pick up this6
is detected and inputted to the control wave %:8 via the amplifier 11. The control device 8 calculates the amount Q of fuel injected by the fuel injection valve 2 from the detection signal of the pressure binoquanozo 6 inputted through the amplifier 1, and calculates the opening time ΔT2 of the solenoid valve 7.
Determine.

Then, an activation signal is output at the ΔT1 time point from the injection start time of the fuel injection valve 2 to keep the solenoid valve 7 open for 312 hours. As a result, the amount of fuel in the fuel volume chamber 1 that is injected by the fuel injection valve 2 passes through the discharge passage 19 and is discharged to the outside through the back pressure regulating valve 9.

In this way, in this embodiment, the fuel is discharged by the electromagnetic valve 7 controlled by the control device 8, so that the cam mechanism synchronized with the fuel pump does not play the role of 8, so the structure is simple and the number of parts can be reduced. .

Note that the present invention is not limited to the above embodiments.

For example, in the above embodiment, the back pressure regulating valve 9 is provided downstream of the electromagnetic valve 7, but the present invention can be implemented without providing the back pressure regulating valve 9.

As described above, according to the present invention, there is provided a fuel injection valve that injects fuel into the fuel volume chamber, a solenoid valve that discharges the fuel in the fuel volume chamber, and a pressure pickup valve that detects the pressure within the fuel container. , based on the detection of this pressure binocular asog, the fuel 1!A output amount of the fuel injection valve is calculated, and from the result of the calculation, the opening time of the solenoid valve is determined, and the operating signal of the solenoid valve is determined. Since the configuration includes a control device that outputs the output after a predetermined time delay from the injection start time of the fuel injection valve, it is possible to provide a fuel injection amount measuring device with a simple structure and low production cost.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a conventional fuel injection amount measuring device, 2112
The figure is a schematic configuration diagram of a fuel injection M measuring device showing an embodiment of the present invention, and FIG. 3 is an Ig waveform diagram illustrating the operation of the embodiment. 1 fuel volume chamber, 2... fuel injection valve, 6... pressure binocanozo, 7... electromagnetic valve, 8... control device. Figure 1 Figure 2 Procedure? ili Seiso Showa ip, A2/Drunk Japan Patent Office Commissioner Manabu Shiga 1, Table of Case 71 < Patent Application No. 186217/1982 2, Name of invention angled fuel injection 64 (ilal side device 3, amendment J Elderly Affairs 14-Which RA Section Special ¥ [Applicant (620) Mitsubishi Heavy Industries Co., Ltd. 4, Sub-Agent 1-26-5, μ Bonomon, Minato, Tokyo No. 17n Hill 6
, Subject of amendment II @ 7, Contents of amendment (1) Akira 111 @ "Used" on page 1, line 16
Add "fuel injection device" next to "fuel injection device". (2) Delete "generally provided" from lines 1 to 20 on page 2 of the specification. (3) Akira nA @ Page 1, line 20, ``Fuel patrol measuring device'' has been corrected to read ``Each time injection amount measuring device.'' (4) In the 1st to 4th lines of page 2 of the specification, "It is like this." This injected fuel is injected at a certain time from 1?il (I to release valve 3).
It is now released to the outside. Correct it as j. (5) Ming I! gl @ Page 4, lines 14 to 18, "-output the first injection valve" is changed to "output the discharge valve activation signal with a preset delay" 3] Correct do. (6) Ming 18! 5th page, lines 8 to 10, "The fuel r31 injector is running.""
The valve opens after 1 hour, and a signal to close the valve is issued after 2 hours. ” he corrected. 7) Change "Fuel injection valve to open" on page 6, lines 5 to 9 of the specification to [The electric valve 7 opens after a preset 1 hour and then closes for 612 hours. . ”, I゛J corrected. (8) On page 7, lines 6 to 10 of the specification, "the above fuel @ side valve is outputted" is corrected to "after a preset predetermined time delay, the solenoid valve for discharge is activated."

Claims (1)

[Claims] a fuel injection valve that injects fuel into the fuel volume chamber; a solenoid valve that discharges the fuel in the fuel volume chamber; a pressure jump assozo that detects the pressure inside the fuel volume chamber; The fuel injection amount of the fuel injection valve is calculated, and the opening time of the electromagnetic valve is determined from the calculation result, and the v+7. A fuel injection amount measuring device comprising: a control device that outputs a magnetic valve activation signal with a predetermined time delay from the injection start time of the fuel injection valve.