JPS60192852A - Engine controller - Google Patents

Abstract

PURPOSE:To permit the correct control for an engine by comparing the throttle opening degree estimated from the intake air amount detected by an air flow sensor and the actual throttle opening-degree and correcting the opening-degree of the throttle valve according to the comparison result and outputting the corrected valve opening-degree information into a fuel injection valve. CONSTITUTION:A controller 14 is equipped with a means M1 which compares the comparison throttle opening-degree (thetas) estimated from the intake air amount detected by an air flow sensor 16 with the actual throttle opening-degree (thetar) detected by a throttle sensor 20 and corrects the throttle opening-degree according to the result of comparison and a means M2 for outputting, under the specific operation state of an engine, the engine control signal on the basis of the throttle opening-degree information corrected by the means M1 into the engine controlled part such as a fuel injection valve 9 or an actuator 12. Therefore, the engine control with high precision is permitted by the means M1 in ordinary case, while said engine control is permitted according to the throttle opening-degree in specific operation, and the fuel control performance in idling time or in deceleration can be improved.

Description

[Detailed description of the invention] The present invention relates to a control device for an engine (internal combustion engine).

Conventionally, by detecting the throttle valve opening (throttle opening) with a throttle sensor consisting of a potentiometer, the fuel supply state to the engine and engine idle state are controlled based on this throttle opening information and engine speed information. It is suggested that things be done.

By the way, while engine control based on throttle opening information has the advantage of good responsiveness, it has the problem that accurate control is difficult to achieve due to errors that occur when installing a throttle sensor.

The present invention aims to solve these problems, and takes advantage of the advantage of engine control based on throttle opening information, which is good responsiveness, while reducing control reliability due to throttle sensor setting (installation) errors. An object of the present invention is to provide an engine control device that can prevent the engine from decreasing.

Therefore, the engine control device of the present invention includes an air flow sensor that detects the amount of intake air in the intake passage of the engine, a throttle sensor that detects the opening of the throttle valve installed in the intake passage, and 1i1J
611, when the engine is under predetermined operating conditions, the calibration throttle valve opening estimated from the intake air amount detected by the air 70 sensor and the actual throttle valve opening detected by the throttle sensor. A correction means is provided for comparing the opening degree of the throttle valve with the opening degree of the throttle valve and correcting the value of the opening degree of the throttle valve according to the comparison result, and the correction means corrects the value of the opening degree of the throttle valve when the engine is under a specific operating condition. The present invention is characterized in that a control means is provided for outputting an engine control signal based on information on the opening degree of the throttle valve to the engine controlled portion.

Hereinafter, an engine control device as an embodiment of the present invention will be explained with reference to the drawings. FIG. 1 is an overall configuration diagram thereof;
FIG. 2 is a schematic diagram showing an example of the display meter, and FIGS. 3-4 are flowcharts for explaining its operation.

As shown in FIG. 1, an internal combustion engine E (hereinafter simply referred to as "engine EJ") such as a gasoline engine for use in a car according to this embodiment is equipped with a turbocharger 3. A turbine 4 is provided in the exhaust passage 2, and a compressor 5 is provided in the intake passage 1 of the engine E and rotated by the turbine 4.

A bypass passage that detours around a portion of the exhaust passage 2 where the turbine is disposed is connected to the exhaust passage 2, and a waste date valve 6 is provided to open and close this bypass passage.

This waste date valve 6 is designed to be opened and closed by a two-plate Guia 7-ram pressure response device 7, and an electromagnetic switching valve 15 (this valve 15 has a return spring (not shown) for the valve body). By selectively supplying atmospheric pressure and supercharging pressure to one pressure chamber of the pressure response device 7, the opening timing of the waste gate valve 6, etc. can be adjusted, and at least two types of supercharging pressure characteristics can be realized. It has become so.

Further, in the intake passage 1 of the engine E, in order from the upstream side (air cleaner side), an air 70-sensor 1G, a compressor 5. Interfu~u8. Electromagnetic fuel injection valves 9 and 10 (these valves 9 and 10 have different injection capacities) and a throttle valve 11 are provided as controlled parts of the engine, and the exhaust passage 2 of the engine E is provided on the upstream side thereof (engine combustion Turbine 4 of turbocharger 3 in order from the room side). A catalytic converter 31 and a muffler (not shown) are provided.

The air 70-sensor 16 detects the number of Karman vortices generated by a columnar body disposed in the intake passage 1 using ultrasonic modulation means or by detecting a change in resistance value. The digital output from the air flow sensor 16 is input to the controller A-214. Note that the digital output from the air flow sensor 1G is applied to, for example, a 1/2 frequency divider within the controller 14, and then subjected to processing such as calibrating the opening degree of the throttle valve 11 (throttle opening degree), which will be described later.

In addition, it is generally said that the air 70-sensor 16 malfunctions due to intake pulsation etc. when the engine E is at low speed and under high load. By appropriately adjusting the dimensions, etc., the intake pulsation as described above almost no longer occurs, so it is considered that the measurement reliability or accuracy by the air 70-sensor 16 is sufficiently high.

Further, a rotation speed sensor 17 is provided, and this rotation speed sensor 17 detects the engine rotation speed by detecting engine rotation speed information from the primary side negative terminal of the ignition coil 28, for example.

Furthermore, a throttle sensor 2 that detects the throttle opening
0 is provided, and a potentiometer is used as this throttle sensor 20.

Also, an intake air temperature sensor 18 that detects the intake air temperature. In addition to an atmospheric pressure sensor 19 that detects atmospheric pressure, a water temperature sensor 21 that detects engine cooling water temperature is provided. 02 sensor 22 that detects the oxygen concentration in exhaust gas. Knock sensor 23 for detecting engine knock condition. Vehicle speed sensor 24 that detects vehicle speed. Idle small switch for detecting engine knock condition 25. Cranking switch 26 that detects when the engine is cranking. The distributor 29 is provided with a crank angle sensor 27 for detecting the crank angle using photoelectric conversion means, and signals from these sensors and switches are input to the controller 14.

Note that the intake air temperature sensor 18. Atmospheric pressure sensor 19. Water temperature sensor 21. Throttle sensor 20,02 sensor 22. Since the detection signal of the knock sensor 23 and the like is an analog signal, it is inputted to the controller 14 via the A/D converter.

Further, the atmospheric pressure sensor 19 may be incorporated into the controller 14.

Furthermore, an actuator 12 such as a DC motor serves as an engine controlled part that rotationally drives the throttle valve 11 via a rod or the like in order to control the engine speed during idling.
is provided.

Further, an ignition coil 28 is provided, and the primary side current of the ignition coil 28 is switched on and off by a power transistor 3o as a switching transistor.

Furthermore, a display meter 13 is provided in the vehicle interior.

For example, as shown in FIG. 2, the display meter 13 receives a control signal (current) from the controller 14 and rotates the driving part of the needle 131d.
Negative pressure region 131a, supercharging region 1311], supercharging region 1
31c (this supercharging region 131c is also referred to as a red zone).
Segment type display section 13 in which these LEDs blink as appropriate
Possible examples include those with b.

Note that when the display meter 13 has an oblique display section 13a, a control signal is supplied from the controller 14 to the display meter 13 via an f-V converter and a current drive circuit.

By the way, the controller 14 is configured with a CPU, memory (including a map), and appropriate input/output interfaces, but specifically, when the engine E is under the following operating conditions, Air 70-
Calibration throttle opening θS (this θS is the intake air amount and The correcting means Ml compares the actual throttle opening θr detected by the throttle sensor 20 with the actual throttle opening θr detected by the throttle sensor 20, and corrects the throttle opening value according to the comparison result. Under operating conditions, the control means M2 outputs an engine control signal based on the throttle opening information corrected by the correction means M1 to the engine controlled parts such as the electromagnetic fuel injection valve 9 or the actuator 12. have. Specifically, the data corrected by the correction means M1 is used when the throttle is opened when surging occurs in the intake system during deceleration of the engine E or when the air flow sensor 16 is disconnected. Estimates the amount of intake air from the engine speed and engine speed,
A fuel supply control signal (this is a " A fuel supply control means that outputs a "engine control signal" can be considered. The engine speed at idle is controlled based on the engine speed (this control is referred to as engine speed feedback control), and the engine speed is controlled based on the throttle opening (this control is referred to as position feedback control) to the actuator 12. An idle feedback control means (idle speed control means) that outputs a control signal (this corresponds to an "engine control signal") can be considered.Here, the above-mentioned operating conditions for the correction by the correction means 1't41 are as follows. When it is stable to estimate the throttle opening from the intake air amount, for example, a very low opening range (near idle) is selected, but specifically when the following conditions are satisfied: .

(1) The rotation speed feedback control continues for a predetermined period of time. (2) The intake air amount is within a preset predetermined range. Note that other than the above-mentioned surging or air 70 sensor failure, Air 70 - Engine E17) determined from the actual intake air amount detected by the sensor 16 and the engine rotation speed detected by the rotation speed sensor 17) Sends a fuel supply control signal to the electromagnetic fuel injection valve '1.30 according to the operating condition. A normal fuel supply control means for outputting the fuel is provided, and the controller 14 also has the function of this control means.

Further, the controller 14 includes an intake passage pressure display control means for outputting a signal corresponding to the intake passage pressure to the display meter 13 based on information on the intake air amount corrected by the intake air temperature and atmospheric pressure, and information on the engine speed. , an ignition timing control means for outputting an ignition timing control signal to the power transistor 30 according to the operating state of the engine E, and the pressure responsive device for adjusting the opening timing of the waste date valve 6, etc. in order to obtain different boost pressure characteristics. It also has the function of a waste date valve control means that outputs a signal to the electromagnetic switching valve 20 that controls the valve 7.

With the above configuration, the throttle opening degree is calibrated as follows. That is, as shown in FIG. 3, various data are input in step A1, and then step A2. At A3, the correction means M1 determines whether or not the throttle opening degree can be calibrated. First, in step A2, it is determined whether the rotation speed feedback control continues for a predetermined time, and if YES in step A2, the intake air amount detected by the air 70-sensor 16 is determined to be within a predetermined range in step A3. It is determined whether

If the answer is YES in step A3, it is determined that the throttle opening degree can be calibrated, and the process proceeds to step A4. In this step A4, the correction means M1 compares the calibration throttle opening θS and the actual throttle opening θr, and calculates the comparison result θS−θr as the setting error (installation error) of the throttle sensor 20. Considering,
The throttle opening value is corrected using this error.

The setting error of the throttle sensor 20 obtained in step A4 is appropriately stored in the memory of the controller 14, and after a predetermined period of time has elapsed and the engine E is again under the above operating conditions, the throttle sensor 20 is adjusted again. The set error of the sensor 20 is determined, and when the throttle opening value is corrected using this new set error value, ν learning control is performed.

Also, step A2. , A3 is No, the throttle opening value is not corrected.

Further, an example of engine control according to this embodiment is shown in FIG. 4. That is, first, in step B1, it is determined whether the engine E is under a specific operating condition (such as when surging occurs in the intake system during deceleration or when position feedback control is desired during idling). , if YES in step B1,
In step B2, the control means M2 performs engine control based on the throttle opening information corrected by the correction means M1 (including throttle opening information that has already been calibrated).

However, if NO in step B1, step B3
Then, the normal fuel supply control means performs control based on the actual intake air amount information.

In this way, it is possible to accurately execute engine control that depends on the throttle opening under a specific operating state of engine E, which improves the performance of, for example, idle speed control and fuel control during deceleration. be.

Note that until the detection of the setting error of the throttle sensor 20 is completed, engine control based on the throttle opening degree is not performed even when the engine E is under the above-described specific operating state. This is because if such machine control is forced in such a case, the control accuracy will worsen.

Furthermore, it is not necessary to perform intake temperature correction or atmospheric pressure correction for the intake air amount.

Furthermore, this device can also be used in engines installed in non-turbo cars.

As described in detail above, according to the engine controller of the present invention, the air sensor 70 detects the amount of intake air in the intake passage of the engine, and the air sensor detects the opening of the throttle valve installed in the intake passage. A throttle sensor and an engine controlled part are provided, and the throttle valve opening for calibration is estimated from the intake air amount detected by the air 70-sensor when the engine is under predetermined operating conditions, and the throttle sensor A correction means is provided for comparing the opening degree of the throttle valve with the actual throttle valve opening degree detected by the engine and correcting the value of the opening degree of the throttle valve according to the comparison result. With a simple configuration that includes a control means for outputting an engine control signal based on the throttle valve opening information corrected by the correction means to the engine controlled part, the throttle valve opening is calibrated during engine operation. This has the advantage that engine control performed under specific operating conditions of the engine can be realized with high precision.

[Brief explanation of the drawing]

The figures show an engine control device as an embodiment of the present invention. Fig. 1 is its overall configuration diagram, Fig. 2 is a diagram showing an example of its display meter, and Figs. 3 and 4 are both It is a flowchart for explaining the effect. 1. Intake passage, 2. Exhaust passage, 3. Turbocharger, 4. Turbine, 5. Compressor, 6. West date valve, 7. Pressure response device, 8. Intercooler, 9.11 )...Electromagnetic fuel injection valve, 11...
Throttle valve, 12...actuator, 13...display meter, 13a...slanted display, 131)...segment type display, 14...controller, 15...electromagnetic switching valve, 16...air 70- Sensor, 17... rotation speed sensor,
18... Intake temperature sensor, 19... Atmospheric pressure sensor, 20...
・Throttle sensor, 21...Water temperature sensor, 22...0
2 sensor, 23...knock sensor, 24...vehicle speed sensor, 25...idle switch, 26...cranking switch, 27...crank angle sensor, 28...ignition fill, 29...distributor, 30...
・Power transistor, 31 ・Catalyst humbater, 13
1a... Negative pressure area, 131b... Supercharging area, 131c...
・Supercharging area, 131d...needle, E...engine, Ml
...Correction means, M2...control means. Figure 1 11 = -11 Figure 2 Figure 3

Claims (1)

[Claims] The engine is equipped with an air flow sensor that detects the amount of intake air in the intake passage of the engine, a throttle sensor that detects the opening degree of a throttle valve installed in the intake passage, and an engine controlled part, so that the engine is operated in a predetermined manner. The calibration throttle valve opening estimated from the intake air amount detected by the air 70 sensor under the above conditions is compared with the actual throttle valve opening detected by the throttle sensor, and based on the comparison result. A correction means is provided for correcting the opening degree value of the throttle valve accordingly, and
A control means is provided for outputting an engine control signal based on the throttle valve opening information corrected by the correction means to the engine controlled part when the engine is under a specific operating condition. An engine control device.