JPS6357838A - Controller for automobile engine - Google Patents

Abstract

PURPOSE:To keep off any slippage of an air-fuel ratio due to the effect of inertia force, by making it controllable to increase engine output according to body deceleration, in case of a device provided with a suction air quantity detecting device having a movable member being subject to the effect of longitudinal inertia force of a car body. CONSTITUTION:At the time of driving a vehicle, a control circuit 19 sets a fuel supply on the basis of output of an air flow sensor 5 having a major ring plate 5a tending to be displaced by receiving longitudinal inertia force of a car body at the time of sudden braking and output of an engine speed sensor 17, etc. In this case, a full-close state of a throttle valve 6 is detected by an idle switch 13, and a face that a clutch is in a state of being engaged is as well detected by a clutch switch 16, and furthermore when a fact that engine speed is at time of high speed of more than the specified one is judged, it is judged that an engine is in a state of being decelerated. And, at the time of judgment of this decelerated state, the throttle valve 6 is controlled so as to be opened in order to increase the engine output.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a fuel supply system that sets the fuel supply amount in response to the output of an intake air amount detection means having a movable member that is affected by the inertia force in the longitudinal direction of the vehicle body. The present invention relates to a control device for an automobile engine having a fuel supply means consisting of a carburetor having a setting means or a foot.

(Prior art) Each eclipse is detected and the amount of fuel injection is determined based on them. (For example, JP-A-58-176
(Refer to Publication No. 423) However, in the above F-flow sensor, the position of the measuring plate (movable member) changes depending on the intake flow rate,
Since the amount of intake air is detected by the change in the position of the measuring ring plate b of the air flow sensor a, the measuring ring plate b of the air flow sensor is displaced (
(see broken line), there is a risk that the intake air amount may be incorrectly detected and the fuel supply amount based on it may not be accurately controlled. Although there is a disclosure of a technique for preventing erroneous detection of the amount of intake air by a shade or the like, this technique cannot solve the above-mentioned problem because it is not applied to inertia forces in the longitudinal direction of the vehicle body. The above phenomenon also applies to carburetors with floats, and the float level in the float chamber may change undesirably due to the influence of inertia in the longitudinal direction of the vehicle body, which may cause the fuel to not be supplied accurately. It arises.

(Object of the Invention) The present invention solves the above-mentioned problem, and provides an automobile engine that prevents the air-fuel ratio from shifting due to the influence of inertia force in the longitudinal direction of the vehicle body and thereby preventing the engine from stalling by increasing the engine output. The purpose is to provide a control device.

(Structure of the Invention) The structure of the present invention for achieving the above-mentioned object is to provide a fuel supply system that sets the fuel supply amount in response to the output of an intake air amount detection means having a movable member that is affected by the inertia force in the longitudinal direction of the vehicle body. In a vehicle having a fuel supply means consisting of a carburetor having a setting means or a float, a vehicle deceleration detection means detects deceleration of the vehicle body, and an engine output is increased according to the deceleration of the vehicle body in response to the output of the vehicle deceleration detection means. The invention is characterized by comprising an engine output increasing means for controlling the engine output so as to increase the engine output.

(Effects of the Invention) The present invention has the advantage that when the vehicle body decelerates during punitive braking, the air-fuel ratio deviates due to the influence of inertia and becomes over-rich or over-lean, but by increasing the engine output,
Embodiments of the present invention will be described below with reference to the drawings.

@1 Figure shows a first embodiment, in which 1 is a fuel injection engine, to which an intake passage 2 and an exhaust passage 3 are connected.

In the intake passage 2, an F-cleaner 4, an air flow meter 5 having a measuring plate 5a, a throttle valve 6, a surge tank 7, and an injector 8 are arranged in order from the upstream side.

Further, a diaphragm device 10 is connected to the throttle valve 6 via a link member 9, and a solenoid valve 12 provided in a passage 11 is controlled by a
Opening 11. Negative pressure is introduced from the opening 11b, and atmospheric air is introduced from the opening 11b to generate a composite pressure, and by introducing the composite pressure into the pressure chamber of the diaphragm device 1°, the throttle valve 6 is opened to a desired opening degree. When activated, the throttle valve 6 is prevented from suddenly closing when the engine is decelerated, thereby preventing engine stalling.

131t This is an idle switch that detects the fully closed state of the throttle valve 6, and is turned ON when the rod end of the link member 9 comes into contact with the throttle valve 6's throttle valve 6.
14 is an ignition signal sensor that detects the output of an ignition signal from an ignition coil (not shown);
15 is a neutral switch that detects the two-earth position of the transmission, 16 is a clutch switch that detects that the clutch is engaged, 17 is a rotation speed sensor that detects the engine speed, and 18 is a sensor that detects the inertial force of the vehicle body. This is a G sensor for detection.

Reference numeral 19 denotes a control circuit which performs various controls in response to inputs from the various sensors or switches described above. In addition, in the first embodiment, the link member 9 and the diaphragm device 10 are
．． The passage 11, the solenoid valve 12, and the control circuit 19 constitute engine output increasing means.

Next, specific control of the first embodiment of the present invention will be explained based on the circuit diagram shown in FIG. The first embodiment is an embodiment in which the output is increased by opening the throttle valve 6 in accordance with the deceleration of the vehicle body.

First, the injection amount calculation circuit 20 receives the outputs of the effluent meter 5 and the rotational speed sensor 17 and calculates the fuel injection amount.

The signal from the injection amount calculation circuit 2o is input to the injection pulse generation circuit 22 via the AND circuit 21.

The injection pulse generation circuit 22 generates an injection pulse commensurate with the injection amount calculated by the injection amount calculation circuit 20 in synchronization with the input of the signal from the ignition signal sensor 14, and outputs the pulse signal via the amplification circuit 23. The idle switch 13 detects the fully closed state of the throttle valve 6, and the neutral switch 15 detects a state other than neutral. The clutch switch 16 detects that the clutch is connected, and the comparison circuit 24 determines that the engine rotation speed detected by the rotation speed sensor 17 is higher than the preset engine rotation speed. If it is determined that the AND circuit 250 conditions are all satisfied, in other words, if all the above conditions are satisfied, it is determined that the engine is in a deceleration state to stop the fuel supply, and the AND circuit 250 is satisfied.
5 inputs the inverted signal O to the AND circuit 21, so that no signal is input to the injection pulse generation circuit 22, so that the supply of fuel is stopped.

On the other hand, the transmitting circuit 26 transmits the signal 1 for a predetermined period of time from when the signal changes from 1 to 0 when all the conditions of the AND circuit 250 are satisfied, that is, from when the cancellation of the fuel supply stop is detected.

Further, the AND circuit 27 operates when the neutral switch 15 detects that the state is not 2-tral and the clutch switch 16 detects that the clutch is connected, that is, the engine and the driving wheels are connected. In this state, even if the throttle valve 6 is suddenly fully closed, there is little chance that the engine will be driven by the drive wheels and stall. When only one of the two is detected as not being connected, outputs No. 1.

Therefore, when a signal of 1 is input from each of the comment circuit 26 and the AND circuit 27, the AND circuit 28 outputs a ξ
・Only when the engine decelerates easily, a signal is input to the solenoid valve 12 via the conversion circuit 29 that converts the 0N-OFF signal to a voltage value and the drive circuit 30 that drives the diaphragm device 10, thereby converting the combined negative pressure into the diaphragm device. 10 into the pressure chamber, the throttle valve 6 is opened to a predetermined degree,
It is designed to prevent engine stalling by increasing the amount of intake air. The drive circuit 30 includes an addition circuit 30a that adds voltage values, and a duty value conversion circuit 30b that converts the voltage value added by the addition circuit 30a into a duty value corresponding to the voltage value. There is.

In the present invention, when the vehicle body is decelerated due to sudden braking in addition to the engine deceleration, the air-fuel ratio may shift due to erroneous detection by the air flow meter 5 due to the shadow of inertia, and the engine stalls. In order to prevent the possibility of
By providing a G sensor 18 for detecting deceleration of the vehicle body and a voltage calculation circuit 31 for calculating a voltage value for adjusting the throttle opening according to the output of the G sensor 18, the addition circuit 30a Above conversion circuit 2
The voltage value from 9 and the voltage value from the voltage calculation circuit 31 are added together, and the added voltage value is converted to a duty value by the duty value conversion circuit 30b, and the duty value is output to x. By doing this, it is possible to adjust the throttle opening according to the deceleration of the car body (for example, the larger the deceleration of the car body, the larger the throttle opening degree), so even if the engine output increases and the air-fuel ratio deviates, the throttle opening will be adjusted accordingly. Engine stall can be prevented.

Next, a second embodiment will be explained based on FIG.

The second embodiment is an embodiment in which the output is increased by changing the fuel supply stop rotation speed according to the deceleration of the vehicle body. Note that the same reference numerals as in Fig. 2 are the same as in Fig. 2, so the explanation thereof will be omitted. 0' where the supply stop conditions are different, that is, the idle switch 13 causes the throttle valve 6 to
is fully closed, and when the engine speed sensor 17 determines that the engine speed is higher than the preset engine speed, an inverted signal 0 is output from the 7nd circuit 25 to the AND circuit 21. By doing so, the fuel supply is stopped, but the set rotation speed is changed according to the deceleration of the vehicle body.To be more specific, the fuel supply is stopped according to the output of the G sensor 18. A function circuit 32 for changing the stopping rotation speed is provided,
Its characteristics are shown in Figures 4 and 5, so the fuel supply stop rotation speed increases according to the deceleration of the car body, and accordingly, the greater the deceleration of the car body, the faster the fuel supply, so under the same driving condition (engine speed and engine load are both the same), when deceleration of the vehicle body is detected, fuel is supplied, resulting in an increase in engine output compared to when deceleration of the vehicle body is not detected. However, in the second embodiment, the injector 8 as a fuel supply means and the function circuit 32 constitute an engine output increasing means.

In addition, the G sensor 18 in the first and second embodiments is provided with a sensor for detecting the operation of the foot brake Φ and a vehicle speed sensor. A similar effect can be obtained by determining that sudden braking is affected by inertia when the vehicle speed is lower than a preset predetermined speed, or when the rate of change in vehicle speed is greater than a predetermined value, and increasing the output. Also, similar effects can be obtained by using ignition timing control means as a means for increasing engine output.

For example, when deceleration of the vehicle body is detected, the output can be increased by advancing the ignition timing from the required ignition timing when no deceleration of the vehicle body is detected, thereby preventing engine stalling. In this case, if the amount of advance is too large, the output will decrease, so it is necessary to limit the amount of advance to an extent that does not exceed the ignition timing that generates pest torque. In this embodiment, the present invention is applied to a fuel injection type engine, but it may also be used in a carburetor, and similar effects can be obtained.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention; FIG. 1 is a characteristic diagram showing the characteristics of the functional circuit in FIG. 3, and FIG. 6 is an explanatory diagram of the action of inertial force.

Claims (1)

[Claims] (1) A fuel supply amount setting means for setting the fuel supply amount in response to the output of an intake air amount detection means having a movable member that is affected by the inertia force in the longitudinal direction of the vehicle body, or a fuel supply means consisting of a carburetor having a float. An automotive engine comprising: a vehicle deceleration detecting means for detecting deceleration of the vehicle; and an engine output increasing means receiving the output of the vehicle deceleration detecting means and controlling the engine output to increase in accordance with the deceleration of the vehicle. An automobile engine control device characterized by: