JPS59158336A - Electronic fuel injection device - Google Patents

Abstract

PURPOSE:To enable the optimum quantity of fuel to be supplied in accordance with a level of acceleration, by measuring a time required for a throttle valve to open at a prescribed angle from its fully closed condition so as to determine an injection quantity of fuel on the basis of the measured result. CONSTITUTION:The first switch 3, detecting whether or not a throttle valve 2 of an internal-combustion engine 1 is placed in a fully closed condition, and the second switch 4, detecting the throttle valve 2 to be opened at a prescribed angle, are provided. Then a length of time, from when the throttle valve 2 displaced from its fully closed condition is detected by the first switch 3 to when the throttle valve 2 opened at the prescribed angle is detected by the second switch 4, is measured by a measuring means 5. On the basis of the result measured by the measuring means 5, a quantity of fuel injected into the internal- combustion engine from an injector 7 is controlled by a control means 6. In this way, the most suitable quantity of fuel can be fed in accordance with a level of acceleration.

Description

[Detailed description of the invention] Technical field of invention The present invention relates to improvements in fuel injection devices for internal combustion engines.

More specifically, the present invention relates to an electronic fuel injection system that can smoothly perform acceleration when the throttle valve is fully closed.

Prior Art and Problems In an internal combustion engine such as a vehicle engine, when accelerating from a state where the throttle valve is fully closed, the following steps are taken to ensure smooth acceleration.

That is, a throttle valve switch is provided to detect whether or not the throttle valve is fully closed, and when the throttle valve switch detects that the throttle valve is no longer fully closed, the normal A certain amount of fuel is injected asynchronously at a timing different from the injection timing. However, since this method injects a fixed amount of fuel regardless of the degree of acceleration, it has the disadvantage that smooth acceleration cannot be achieved depending on the degree of acceleration.

In addition, a sensor is installed to detect the amount of intake air or intake pipe pressure, and the degree of acceleration is detected based on the detection result of the sensor, and an amount of fuel is asynchronously injected according to the degree of acceleration. has also been proposed.

This method can inject the amount of fuel according to the degree of acceleration, but since the degree of acceleration is detected based on the amount of intake air and intake pipe pressure, the surge tank This has the disadvantage of causing a delay in response.

OBJECTS OF THE INVENTION The present invention has been made to improve the above-mentioned drawbacks, and its purpose is to inject an amount of fuel corresponding to the degree of acceleration without delay in response.

Structure of the Invention As shown in FIG. 1, the present invention includes a first switch 6 that detects whether the throttle valve 2 of the internal combustion engine 1 is fully closed, and a first switch 6 that detects that the throttle valve 2 is opened by a predetermined angle. A second switch 4 is provided. Then, the time elapses from when the first switch 4 detects that the throttle valve 2 is no longer fully closed to when the second switch 4 detects that the throttle valve 2 is opened to a predetermined angle. is measured by the measuring means 5, and based on the measurement result of the measuring means 5, the control means 6 controls the injector 7 to
'''-Controls the amount of fuel injected.

Examples of the invention FIG. 2 is a block diagram of an embodiment of the invention.

In Figure 2, 1 is the internal combustion engine main body, and intake air is supplied to each cylinder from each branch of the intake manifold 9 via an air cleaner, a flow meter (not shown), and a throttle chamber 8. is injected into the internal combustion engine 1 by an electromagnetic injector 7 whose fuel injection time is controlled by a control signal output from a data output device 13.The flow of intake air is controlled by an accelerator pedal (not shown). It is controlled by a slot A2 in the throttle chamber 8 which is interlocked with the throttle valve 8. In the same figure, 6 indicates the output signal α is "1" when the throttle valve 2 is fully closed, and when it is not fully closed, it is controlled by the slot A2 in the throttle chamber 8. The switch 4 sets the output signal α to "0" when it detects that the throttle valve 2 has opened by a predetermined angle (when it detects that the throttle valve 2 is in the state shown by the dotted line). 1'' is a switch, 10 is a processing device including a microprocessor, 11 is a memory, 12 is a data input device, and 13 is a data output device.

When the processing device 10 detects that the signal α applied from the switch 6 through the data input device 12 changes from “1” to “0” (two liquids), it starts clocking the internal clock,
The signal 6 applied from the 2 switch 4 through the data input device 12 continues to run the internal clock from "0" to "1" (2).In this way, the throttle valve 2 changes from the fully open state to the predetermined angle. Time T+ (1 hour T1 becomes shorter as the degree of acceleration becomes rougher).

), the processing bag @10 calculates the amount of fuel to be injected based on the time T1, that is, the time T2 for injecting the fuel from the injector 7 (the time T, t- is almost inversely proportional), and then calculates the amount of fuel to be injected from the injector 7 (the time T, t- is approximately inversely proportional to the amount). A control signal for injecting fuel is generated and sent to the data output device 13, and the electromagnet of the injector 7 is excited by the output signal C of the data output device 16, and fuel is asynchronously injected from the injector 7 for a time T. , when calculating the fuel injection time 7"2 based on the time T1, it may be calculated by performing the calculation shown in the following equation (1), or the time T1 and the time T1 can be stored in the memory 11.
2 may be provided, and the time T2 may be determined by referring to the table.

However, K is a proportionality constant.

Furthermore, except when acceleration is performed from a state where the throttle valve 2 is fully open, the processing device 10 performs synchronous injection that is synchronized with the rotation C of the internal combustion engine.

Further, in Example g2, only one switch 4 was provided to detect that the throttle valve 2 was opened by a predetermined angle, but a plurality of such switches were provided to perform more fine-grained control. Of course, this is also a good thing.

DETAILED DESCRIPTION OF THE INVENTION As described above, the present invention is based on the first aspect. A second switch is installed to measure the time it takes for the throttle valve to open from a fully closed state to a predetermined angle, and the amount of fuel to be injected is determined based on the measurement results. There is an advantage that an optimum amount of fuel can be injected without delay in response, and therefore acceleration can be smoothly performed from a state where the throttle valve is fully closed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the present invention, and FIG. 2 is a block diagram of an embodiment of the present invention. 1 is an internal combustion engine, 2 is a throttle valve, 3 and 4 are switches, 5 is a measuring means, 6 is a control means, 7 is an injector, 8
is the throttle chamber, 9 is the intake manifold,
10 is a processing device, 11 is a memory, 12 is a data input device, and 13 is a data output device. Patent applicant Fujitsu Ten Ltd.

Claims (1)

[Claims] a first switch that detects whether the throttle valve is fully closed; a second switch that detects that the throttle valve is opened by a predetermined angle; and a second switch that detects whether the throttle valve is fully closed. measuring means for measuring the time from the time when it is detected that the throttle valve is no longer in the state to the time when the second switch detects that the throttle valve is opened by a predetermined angle;