JPH0421011Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention improves the acceleration response performance of an engine equipped with an electronic fuel injection device by using a fuel injection circuit that injects fuel within a predetermined time from the start of engine racing. The present invention relates to a device for measuring the number of fuel injections.

[Conventional technology]

In general, the acceleration response performance of an engine equipped with an electronic fuel injection system is determined from the start of racing when the accelerator pedal, which is linked to the throttle valve, is pressed all at once and the throttle valve is fully closed. It is evaluated by measuring the number of times fuel is injected within a period of time.

An electromagnetic oscillograph that can record high-speed phenomena is used as a measuring device for this purpose, and the input terminal of channel 1 of the electromagnetic oscillograph receives a signal output from the fuel injection signal output terminal of the computer for controlling the electronic fuel injection system. Signals are provided via connecting lines. In addition, the input terminal of channel 2 is connected to an idle switch on/off signal that detects the throttle valve opening and turns on when the throttle valve is fully closed and turns off when the throttle valve starts to open. Supplied via line.

In other words, the electromagnetic engine is equipped with a fuel injection signal output from a computer that controls an engine equipped with an electronic fuel injection device, and an idle switch signal that is attached to the throttle body and turns on and off by detecting the opening of the throttle valve. are entered respectively. In addition, a predetermined clock signal is automatically recorded on the longitudinal edge of the recording paper.

Measurement devices using such electromagnetic oscilloscopes are not suitable for mounting on vehicles because they are large and use recording paper, and must be placed outside the vehicle. Two people are required: a driver who depresses the accelerator pedal all at once, and a person outside the vehicle who communicates with the driver and operates an electromagnetic oscillograph in conjunction with the accelerator pedal depression operation. In addition, since the pulse waveform as the fuel injection signal, the idle switch on/off signal, and the clock signal are individually recorded on the recording paper, each recorded data is linked and set to the specified value each time the actual measurement test is completed. The number of fuel injections per hour is counted.

Such acceleration response performance depends on the generation pattern of the fuel injection signal, which is injected asynchronously from the computer controlling the electronic fuel injection system to increase the amount during acceleration at the start of racing. It is necessary to repeatedly evaluate the acceleration response performance experimentally each time the generation pattern of the acceleration changes.

Therefore, it takes several hours for two people to complete one comprehensive evaluation test, and the recording paper for the electromagnetic oscillograph is 10 meters long.
The current situation is that we are consuming a certain amount. Generally, engines are often tested in a no-load state, but there are also cases where a load test on a chassis seat drum or an actual running test is performed.

[Problem that the invention attempts to solve]

However, with this type of fuel injection frequency measuring device using an electromagnetic oil graph, since the measuring device is placed outside the vehicle, two people, the driver and the measuring person, are required at all times. It takes several hours, and as the number of comprehensive evaluation tests increases, a large number of man-hours are required.Since it is a joint effort between the driver and the measurer, it is necessary to signal the completion of measurement preparations, signal the start of measurement, and calibrate the measurement device. , requires man-hours to prepare for linked operations such as checking, making it difficult to conduct repeated actual measurement tests that match test conditions; and requiring a large amount of testing costs due to the use of large amounts of electromagnetic oscilloscope recording paper. There are problems such as these, and these problems need to be resolved.

Therefore, the purpose of the present invention is to enable acceleration response performance testing of engines equipped with electronic fuel injection devices without using special consumables such as recording paper.
The purpose is to allow one driver to perform automatic measurements in a short period of time.

[Means for solving problems]

Therefore, this invention allows for short and automatic digital measurement of the number of fuel injections within a predetermined time from the start of racing by pressing and releasing the accelerator pedal, which is linked to the throttle valve. It is characterized by the following.

Specifically, there is an idle switch that detects the opening degree of the throttle valve and detects whether the throttle valve is fully closed or starting to open, and an output from the idle switch when the throttle valve starts to open from the fully closed state. A gate signal generation circuit that continuously outputs a signal for a predetermined period of time according to a signal generated by the gate signal generation circuit, and a gate signal output from the gate signal generation circuit and fuel output from a computer for controlling the electronic fuel injection device. to take the AND with the injection signal.
The AND circuit and the fuel injection signal output from the AND circuit are counted, and the count is cleared by the signal output from the idle switch when the throttle valve changes from open to fully closed. It is composed of a counting circuit as described above, and a display section for digitally displaying the count contents of the counting circuit.

[Effect]

If you press the accelerator pedal that is linked to the throttle valve all at once and race the throttle valve from fully closed to fully open, the idle switch will output a detection signal when the throttle valve starts to open from fully closed. A gate signal is output from the gate signal generation circuit in response to this detection signal.

On the other hand, a fuel injection signal corresponding to the idling speed is input into the AND circuit in advance, and since a fuel injection signal for asynchronously injecting fuel to increase fuel consumption during acceleration is added at the start of racing, the fuel injection signal is set by the gate signal. These fuel injection signals that occur within a predetermined period of time are output from the AND circuit.

The fuel injection signal output from the AND circuit is counted by a counting circuit, and the content of the count can be displayed digitally on the display. When the accelerator pedal is returned to the initial position and the throttle valve is fully closed after reading the digitally displayed count contents, a detection signal is output from the idle switch, and this detection signal activates the counting circuit. It is set to reset.

Therefore, when the driver depresses the accelerator pedal all at once, the number of fuel injections, which indicates acceleration response performance, is automatically displayed digitally on the display.
The driver can simply read the numbers on the display. After reading the numbers on the display, return the accelerator pedal to the initial position and fully close the throttle valve to reset the counting circuit and clear the counting contents, allowing you to complete the first measurement test. . If you want to continue the second actual measurement test, you can step on the accelerator pedal all at once and repeat the above-mentioned operation.

〔Example〕

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

FIG. 1 is an electric circuit configuration diagram of an embodiment of the present invention, in which the first input terminal 1 of the fuel injection number measuring section 10
1 is a fuel injection signal output terminal 21 provided in a control computer 20 of an electronic fuel injection device.
is connected to via a circuit protection resistor 22,
Further, the second input terminal 12 is connected to an idle switch signal terminal 23 provided in the control computer 20 via a differential circuit constituted by a capacitor 24 and a resistor 25. The differentiating circuit constituted by the capacitor 24 and the resistor 25 is a circuit for extracting a falling signal when the idle switch is switched from on to off, and a rising signal when the idle switch is switched from off to on. This is to distinguish between an open state and a fully closed state when starting to open from a fully closed state.

The idle switch then detects the opening degree of the throttle valve, which is linked to the accelerator pedal, and
It operates so that it is turned on when the throttle valve is fully closed and turned off when the throttle valve begins to open, and is attached to the throttle body.

The fuel injection number measurement section 10 is composed of a gate signal generation circuit 13, an AND circuit 14, a counting circuit 15, and a display section 16.

First input terminal 11 of fuel injection number measuring section 10
is connected to the input terminal of the AND circuit 14, and the second
The input terminal 12 of is connected to the gate signal generating circuit 13 and the reset terminal R of the counting circuit 15. The gate signal generation circuit 13 is a circuit that generates a gate signal having a predetermined time width in response to a falling signal when the idle switch is switched from on to off, and uses a monostable multivibrator. The time width of the gate signal can be adjusted by switching the time constant setting resistor.

The output terminal of the gate signal generation circuit 13 is AND
It is connected to one input terminal of the circuit 14, and the output terminal of the AND circuit 14 is connected to the input terminal of a counting circuit 15 for counting the number of fuel injection signal generation circuits output from the AND circuit 14. The output terminal of the counting circuit 15 is connected to the input terminal of a display section 16 that can digitally display the counted contents on a liquid crystal display, a fluorescent display tube, or the like.

Next, the operation of this embodiment will be explained.

Figure 2 is a graph illustrating the relationship between throttle valve opening and engine speed when racing from fully closed throttle valve to fully open throttle valve by pressing the accelerator pedal all at once, with time plotted on the horizontal axis. . Note that this graph shows an example of the results measured with a four-cylinder gasoline engine in an unloaded state. As can be seen from Figure 2, it takes 70msec to 80msec to fully open the throttle valve from fully closed by pressing the accelerator pedal all at once, and it takes T time (for example, 130msec to 230msec) for the throttle valve to change from fully closed to fully open. It has been confirmed through experiments that the suitability of the generation pattern of the asynchronous fuel injection signal for increasing the fuel amount during acceleration up to the point in time that has elapsed affects the acceleration response performance of the engine. In this case, the engine speed begins to rise rapidly after 500 msec has elapsed from the throttle valve fully closed state, and the suitability of the fuel injection signal generation pattern for increasing the amount of fuel injected during acceleration by the elapse of time T is determined by the engine speed. Sensory evaluation is performed based on the presence or absence of sluggishness and backfire, and the optimal fuel injection signal generation pattern is determined through a series of actual measurement tests.

FIG. 3 shows a time chart of generated signals at the main points (a to e) of the electrical circuit configuration diagram shown in FIG. 1. Depress the accelerator pedal, which is linked to the throttle valve, all at once, and
As shown in the figure, when the throttle valve starts to open from the fully closed state when racing from the fully closed state to the fully open state, the signal at the idle switch signal terminal 23 of the control computer 20 is As shown in the figure, since the switching is from on to off, the capacitor 2
A falling signal shown in FIG. Second input terminal 12
Gate signal generation circuit 1
3, a gate signal shown in FIG. 3c having a predetermined time width T (for example, 150 msec) is generated.

On the other hand, as shown in FIG. 3d, the first input terminal 11 simultaneously receives a synchronous fuel injection signal A for operating the engine at idling speed and an asynchronous fuel injection signal B for increasing the amount during acceleration. Therefore, the AND circuit 14 outputs the asynchronous fuel injection signal B that is generated within the time width T of the gate signal obtained from the gate signal generation circuit 13, as shown in FIG. 3e. The asynchronous fuel injection signal B output from the AND circuit 14 is
The contents of the count are digitally displayed on the display section 16. In this case, if the synchronous fuel injection signal A and the asynchronous fuel injection signal B are output at the same time, the two signals A and B are added and the pulse width becomes wider, but the generation circuit remains the same.

On the other hand, after reading the count content digitally displayed on the display section 16, when the accelerator pedal is returned to the fully closed state of the throttle valve, the signal of the idle switch changes from off to on, as shown in Figure 3a. As a result, a rising signal as shown in FIG. 3b is generated at the second input terminal 12. Since this rising signal is input to the reset terminal R of the counting circuit 15, the counting contents of the counting circuit 15 are cleared, and the counting display on the display section 16 disappears and is set to the initial state.

Therefore, when the driver depresses the accelerator pedal all at once, the number of fuel injections representing acceleration response performance is automatically digitally displayed on the display 16, so the driver only needs to read the count display on the display 16. After reading the content displayed on the display section 16, the accelerator pedal is returned to the original idle position, the count display on the display section 16 is cleared, and the first measurement test is completed.

If the second actual measurement test is to be performed continuously, the accelerator pedal may be depressed all at once in the same state, and the above-described operation may be repeated. Therefore, measurement can be carried out in an extremely short period of time by one driver.

In the case of this embodiment, a fuel injection signal output terminal 21 and an idle switch signal terminal 23 provided in a control computer 20 of an electronic fuel injection device
In addition to extracting a signal for measuring acceleration response performance, a predetermined time T (for example, ,
Since the number of fuel injections within 150 msec) is automatically displayed and cleared on the display unit 16, one driver can easily check the acceleration response performance of an engine equipped with an electronic fuel injection device. without using special consumables such as recording paper.
Digital measurement can be performed automatically and in a short period of time.

In addition, since the fuel injection frequency measuring section 10 is small and can be installed in a vehicle, it can be set in an instrument panel and can be easily used for actual driving tests and bench tests using a chassis dynamo.

[Effect of idea]

When racing from the throttle valve fully closed to the throttle valve fully open, the number of fuel injections to be injected within a predetermined time from the start of racing is automatically displayed on the display or cleared by only operating the accelerator pedal. Because it is becoming more and more
The acceleration response performance of an engine equipped with an electronic fuel injection system can be digitally measured by a single driver in a short period of time and automatically without the use of special consumables.

[Brief explanation of the drawing]

Figure 1 is an electric circuit configuration diagram of an embodiment of the present invention, and Figure 2 is a graph illustrating the relationship between throttle valve opening and engine speed when racing from throttle valve fully closed to throttle valve fully open. , FIG. 3 is a time chart of signals generated at the main parts of the electrical circuit configuration diagram shown in FIG. 1. DESCRIPTION OF SYMBOLS 10...Fuel injection number measuring part, 11...First input terminal, 12...Second input terminal, 13...Gate signal generation circuit, 14...AND circuit, 15...
... Counting circuit, 16 ... Display section, 20 ... Control computer. 21...Fuel injection signal output terminal, 2
2, 25...Resistor, 23...Idle switch signal terminal, 24...Capacitor.

Claims (1)

[Claim for Utility Model Registration] The acceleration response performance of an engine equipped with an electronic fuel injection device when racing from the throttle valve fully closed to the throttle valve fully open is injected within a predetermined time from the start of racing. In a device that measures the number of fuel injections, there is an idle switch that detects the opening degree of the throttle valve and detects whether the throttle valve is fully closed or starting to open, and an idle switch that detects whether the throttle valve is fully closed or starting to open. a gate signal generation circuit that continuously outputs a signal for a predetermined period of time based on a signal output from the idle switch when the idle switch is activated, and a gate signal output from the gate signal generation circuit and an electronic fuel injection device. An AND circuit is used to calculate the logical product of the fuel injection signal output from the control computer, and the fuel injection signal output from the AND circuit is counted. The present invention is characterized by comprising a counting circuit whose counting contents are cleared by a signal output from the idle switch when the idle switch is idle, and a display section for digitally displaying the counting contents of the counting circuit. Fuel injection frequency measuring device.