JPS60256524A - Control device in engine - Google Patents

Abstract

PURPOSE:To make it possible to control the supply of fuel with a high degree of accuracy, by detecting an offset amount in the opening degree of the throttle valve or the depressing amount of an accelerator pedal in a specified range upon depression of a brake pedal, and by compensating the above-mentioned opening degree in accordance with the offset amount. CONSTITUTION:Upon operation of an engine 1, a control circuit 11 determines, in accordance with a load signal (d) from a vacuum sensor 13 and a rotational speed signal (f) from an ingnition coil 16, whether the rotational speed of the engine 1 and the vacuum of intake-air are within their predetermined ranges, respectively, and if they are within the predetermined ranges, it is determined that the engine is in the idle condition. Further, when a brake sensor 18 is turned on upon depression of a brake pedal 17 while the temperature of cooling water which is detected by a water temperature sensor 15 exceeds a predetermined value, an offset amount alpha is subtracted from the output value To of a throttle valve opening degree sensor 12 to compensate the output value To to a value T corresponding to an actual opening degree. Then, the amount of fuel injection is computed in accordance with the thus compensated value to control a a fuel injection valve 10.

Description

[Detailed Description of the Invention] (Field of Industrial Application) □ The present invention is an automatic i engine control device, in particular, when performing control according to the opening of a throttle valve or accelerator pedal, it is possible to control the opening of the throttle valve or accelerator pedal correctly. Control m+ for detection
Regarding equipment.

(・Prior art) In automobile engines, for example, the amount of fuel supplied is sometimes controlled depending on the opening degree of the throttle valve. etc., when using them for various controls, accurately detecting their opening degrees is the most important factor in achieving accurate control! ! : That's the thing.

However, these opening degrees are detected by a sensor using a variable resistor, etc., and the output voltage is set to be 0 volts when the opening degree is zero, but variations in the sensor itself and the sensor Due to incorrect installation or the like, the output value does not necessarily become zero when the opening degree is zero, and an offset L, that is, a zero point error □ may occur. Therefore, in the past, when the control system was assembled during engine production, adjustments were made to reduce the offset amount to zero, but this was said to be extremely troublesome. However, there are cases where the adjustment is not accurate, and it is not possible to reliably prevent control errors during engine operation. Also, during operation of the IC1 engine, the zero point may shift and an offset amount may occur, which may gradually deteriorate the accuracy of Isutoshi's control.

By the way, regarding the control of the thrower 1 hell valve, there is an invention disclosed in, for example, Japanese Unexamined Patent Publication No. 138235/1983. This includes an accelerator distance detector, a throttle valve distance detector, a reversible motor that opens and closes the thrower 1 valve, and controls the rotation direction and amount of rotation of the reversible motor according to the outputs of both of the above detectors. It is equipped with a control circuit that
By electrically linking the accelerator pedal and throttle valve instead of linking them via a conventional link mechanism, the movement of the accelerator pedal is accurately and optimally reflected in the opening of the throttle valve. This is what I did. However, even with such a control, it is important to accurately detect the opening of the accelerator pedal and the 20"to" valve, and the above detector has a zero point error (offset amount). If so, the intended purpose will not be achieved.

(Object of the Invention) The present invention deals with the above-mentioned actual situation regarding engine control.
If there is an offset amount in the output value when the sensor which detects these opening degrees is fully opened, this is automatically corrected to always output a signal that accurately corresponds to the actual opening degree. It is an object of this invention to enable engine control to be performed with high accuracy at all times, without requiring troublesome adjustment work, and even when the engine is used for a long period of time.

By the way, when making the above correction, it is necessary to correctly detect the offset amount of the output of the opening detection sensor when the throttle valve is fully open. If the sensor output value when the engine is not in the fully closed state is used as the offset amount, an incorrect correction will be made and the engine control will be confused. To deal with this, it is possible to determine the fully open state of the throttle valve or accelerator pedal based on conditions such as zero vehicle speed or brake activation, but it is possible that the accelerator pedal is depressed even when the vehicle speed is zero, that is, when the vehicle is stopped. In addition, the brake pedal and the accelerator pedal may be operated at the same time, and if the fully open state is determined under these conditions, there is a possibility that the offset amount will be set incorrectly.

Therefore, the present invention sets the conditions for determining the fully open state of the throttle valve or accelerator pedal to 1. By using both the engine operating state and the brake operating state, the offset amount of the output value of the opening detection sensor is accurately grasped, and the opening signal of the throttle valve, etc. used for the engine control is determined. The purpose is to make accurate corrections.

(Structure of the Invention) An engine control device according to the present invention is characterized in that it is configured as follows in order to achieve the above object.

That is, as shown in FIG. 1, an opening detecting means A for detecting the opening of the throttle valve or the accelerator pedal is provided.
In a configuration in which engine control is performed appropriately according to these opening degrees, an operating state detecting means B detecting the operating state of the engine, a brake operation detecting means C detecting the operation of the brake, and a By inputting the signals from means B and C and the signal from the opening detection means A, the signal from the opening detection means A is detected when the engine operating state is in a specific operating range and the brake is operating. The offset amount detection means detects and sets the indicated value as the offset amount when fully opened, and furthermore, the offset amount detection means detects a signal output from the opening detection means for normal engine control. It is provided with a correction means E that corrects by an offset amount. Specifically, the operating state detection means B detects at least the engine rotational speed and intake negative pressure, and determines the idle state of the engine from these values.

Then, when the engine is in an idling state and the brake is depressed, the offset amount detection means detects and sets the output value of the opening degree detection means A as the offset value 1~, but in such a state, the accelerator pedal The throttle valve is certainly fully open, so the offset amount is detected correctly, and the output signal from the opening detection means A used for engine control is accurately corrected.

In addition, if the engine is equipped with a fast idle system for warming up, that is, a system that opens the throttle valve a certain amount when the engine is idling when the engine is cold, such as when starting, to promote warm-up, then Since there is a possibility that the throttle valve is also in doubt, if the opening at this time is taken as the offset amount of the opening detecting means A, an incorrect correction will be made. Therefore, in such a case, the cooling water temperature is added to the amount detected by the operating state detection means B, and the specific operating range of the engine detected by the means B is set to be in the idle state and when the fast idle system is not operating. The area where the cooling water humidity is above a predetermined value is set to prevent the above-mentioned erroneous correction.

(Example) The present invention will be described below with reference to an example of fuel control shown in the drawings.

As shown in FIG. 2, the engine 1 is provided with an intake passage 5 and an exhaust passage 6 that communicate with the combustion chamber 4 via an intake valve 2 and an exhaust valve 3, respectively, and the intake passage 5 has an upstream side. An air cleaner 7, an air 70-meter 8, a throttle valve 9, and a fuel injection valve 10 are provided. A control signal a is sent to the fuel injection valve 10 from a control circuit 11, and an air flow rate signal from the air flow meter 8 and a throttle opening sensor 12 provided in the throttle valve 9 are sent to the control circuit 11. (1) 1#10) (1) 1#10 Ni-yoga
＊＋□, 8□ka. 6, there are 3. Here, as shown in FIG. 3, the throttle opening sensor 12 is composed of a variable resistor 12a, and as a movable contact 12b of the resistor 12a rotates integrally with the throttle valve 9, the valve 9 A voltage signal C corresponding to the opening degree of the opening is output.

The control circuit 11 also receives a negative pressure signal d from an intake negative pressure sensor 13 provided in the intake passage 5 and a water temperature signal e from a water temperature sensor 15 provided in the water jacket 14 around the combustion chamber 4. A rotation signal f indicating the engine rotation speed from the ignition coil 16 and a brake signal g from a brake sensor 18 provided on the brake pedal 17 and detecting depression of the pedal 17 are inputted. There is. And these signals d.

The fully open state of the throttle valve 9 is determined based on e, f, and g, and the value indicated by the opening degree signal C at that time is set as an offset amount, and this offset amount 1. is used to correct the throttle opening degree and signal C used for the above fuel control.

Next, the specific operation of the control circuit 11 will be explained according to the flowchart shown in FIG.

First, the control circuit 11 reads the output value To of the throttle opening sensor 12 from the opening signal C in step S1. Next, in steps 82 and 83, it is determined from the rotation signal f and the negative pressure signal d whether the rotational speed of the engine 1 and the intake negative pressure are within predetermined ranges. Then, when these are all within a predetermined range, specifically, in a region X below a predetermined rotation speed No shown in the shaded area in FIG. It is determined that there is, and then step S4 is executed. In this step S4, the brake pedal 17 is determined from the output signal g of the brake sensor 18.
It is determined whether or not the brake is depressed, and when the brake is ON (depressed), it is further determined in step S5 whether the coolant temperature is equal to or higher than a predetermined value based on the water temperature signal e. This is to determine whether or not the 71-stroke idle system is operating when engine 1 is idling.
If the cooling water temperature is above a predetermined value, it is determined that the system is not operating. As described above, when the operating state of the engine 1 is in the idle state (shaded area X in Figure 5), the brake pedal 17 is depressed, and the fast idle system is not operating (cooling When the water humidity is above a predetermined value), in other words, when it is determined that the accelerator pedal is not depressed and the throttle valve 9 is definitely in the fully open state, the control circuit 11 performs the reading in step S1 in step S6. The output value To of the throttle opening sensor 12 is updated and set as the value α in the memory 1.1a shown in FIG. In that case, when there is no error in the throttle opening sensor 12 and the output value To correctly indicates zero when the throttle valve 9 is fully opened, the value α becomes zero, but for example, when the contact 12b shown in FIG. When the output value To of the sensor 12 is not zero even though the throttle valve 9 is fully open, such as when the positional relationship with the throttle valve 9 is out of order, this The value α indicates the amount of offset.

Then, the control circuit 11 detects and updates the sensor output value To by an offset amount α when the predetermined conditions are met as described above (when all steps 82 to S5 in FIG.
With this stored, the fuel supply to the fuel injection valve 10 is controlled based on the air flow rate signal S and the throttle opening signal C. At this time, if the throttle opening signal 0 is directly used for this fuel control, , if the sensor output value To does not correspond to the actual opening degree, the fuel supply amount will be incorrect. However, during this fuel control, the control circuit 11 controls the output value T of the throttle opening sensor 12 in step S7.
The above offset amount α is subtracted from o, and the output *T
o is corrected to a value T corresponding to the actual opening degree. Then, in step S8, a fuel supply amount is set based on this corrected value T, and this is outputted to the fuel injection valve 10 as a control signal a.

In this way, when there is a zero point error in the #i' output value of the throttle opening sensor 12, the offset amount g:
'1 is updated and set each time the throttle valve 9 is fully opened, and the above output value is corrected using this updated offset amount, so that the fuel supply amount can always be controlled accurately. You will be exposed. In that case, since the offset amount is detected or updated at a predetermined time when it is determined that the throttle valve 9 is reliably closed, the offset amount is detected or the output value of the opening sensor 12 is corrected. will always be done correctly.

Here, it is desirable to use a nonvolatile memory as the memory 11a in the control circuit 11 so that the stored offset amount can be saved even when the power is turned off.

In addition, in order to more reliably prevent erroneous detection of this offset amount, the output value of the throttle opening sensor 12 is repeatedly detected multiple times when one predetermined condition is met, and the average value is stored as the offset m. It is desirable to do so.

Although the above embodiments apply the present invention to a throttle opening sensor used for engine fuel control, the openings of throttle valves and accelerator pedals can also be used for other controls. In this case, the same method as this embodiment can be applied.

(Effects of the Invention) As described above, according to the present invention, when the opening degree of the throttle valve or accelerator pedal is used for various engine controls such as fuel control, zero point error is caused in the sensor that detects the opening degree of the throttle valve or accelerator pedal. Even if there is, this will always be correctly and automatically corrected, resulting in an output value that accurately corresponds to the actual opening degree. This allows this type of engine control to be performed with high precision.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the overall configuration of the present invention, FIG. 2 is a control system diagram showing an embodiment of the present invention, FIG. 3 is an enlarged view showing the schematic configuration of the throttle opening sensor in FIG. FIG. 4 is a flowchart showing the operation of this embodiment, and FIG. 5 is a graph showing the control range of the engine. 1... Engine, 9... Throttle valve, 11.
... Control circuit, 12 ... Throttle opening sensor, 13
...Negative pressure sensor, 15...Water temperature sensor, 16...
Ignition coil, 17...Brake pedal, 1
8...Brake sensor. Applicant Mazda Co., Ltd. Figure 4 Figure 5

Claims (1)

[Claims] (1) An operating state detection means for detecting the operating state of the engine, an opening detection means for detecting the opening degree of the throttle pulse, bu or accelerator pedal, and whether the operating state detected by the above operating state detection means is a specific operation or operation. an offset amount detection means for detecting an offset amount of the opening of the throttle valve or the accelerator pedal when the brake is in the range and the brake is depressed; 1. A control device for an engine, comprising: a correction means for correcting the amount of offset detected by □.