JPH086616B2 - Engine controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is designed to drive a throttle valve independently by removing a mechanical connection between an engine control device, particularly an accelerator pedal and a throttle valve. More specifically, the present invention relates to measures for improving output responsiveness when a vehicle exits a corner.

(Prior Art) Conventionally, as an engine control device of this type, as disclosed in, for example, Japanese Patent Laid-Open No. 51-138235, there is provided a drive means for driving a throttle valve, and the drive means
By electrically controlling the opening degree of the throttle valve according to an increase in the operation amount of the accelerator pedal (accelerator operation amount) based on a characteristic preset according to the accelerator operation amount, It is known that an engine output is secured as desired by supplying an intake air amount according to a request to the engine.

(Problems to be Solved by the Invention) However, in the above-mentioned conventional one, when the vehicle enters the corner and then exits from the corner, the throttle valve opening degree is set by the driving means in accordance with the accelerator operation amount by the driver. Although the vehicle is accelerated by controlling the expansion to the corresponding opening, the increase of the throttle valve opening is delayed by the responsiveness of the drive means, and the startup performance of acceleration at the time of corner escape deteriorates. There are drawbacks.

The present invention has been made in view of such a point, and particularly paying attention to the fact that the accelerator pedal opening is kept small when a vehicle enters a corner, and the purpose thereof is to previously output the engine output when the vehicle enters a corner. While suppressing the sudden change of
By forcibly opening the throttle valve opening to prepare for a corner exit, even when the vehicle exits a corner,
It is to improve the output response of the engine and improve the rising performance of acceleration.

(Means for Solving Problems) In order to achieve the above object, the solution means of the present invention is an engine for electrically controlling the opening of a throttle valve based on a characteristic preset according to an accelerator operation amount. Assuming a control device. Then, as shown in FIG. 1, a driving means 7 for driving the throttle valve 6, an output adjusting means 22 for adjusting the engine output separately from the throttle valve 6, and a corner approach for detecting when the vehicle enters a corner. The drive means for receiving the outputs of the time detection means 45 and the corner entry time detection means 45 so as to open the throttle valve 6 by a predetermined opening, which is larger than a predetermined opening corresponding to the accelerator operation amount at that time. 7 at the same time, and a corner entry control means 46 for controlling the output adjusting means 22 so as to reduce the engine output. Further, the output from the corner entry control means 46 so as to cancel the engine output reduction adjustment by receiving the output of the corner exit detection means 47 for detecting the corner escape of the vehicle and the corner exit detection means 47. A corner escape control means 48 for stopping the control of the adjusting means 22 is provided.

(Operation) With the above configuration, in the present invention, when the vehicle enters the corner, the opening of the throttle valve 6 corresponds to the accelerator operation amount by the driving means 7, although the opening of the accelerator pedal is kept small by the driver. It is opened by a predetermined amount rather than the opening to prepare for acceleration when exiting a corner. In this case, the engine output is increased by the amount corresponding to the opening of the throttle valve 6, but at this time, the corner admission control unit 46 adjusts the engine output by the output adjustment unit 22 to reduce the engine output. There is no sudden change as a whole, and the vehicle starts cornering smoothly.

Then, when it comes to the situation of accelerating the vehicle at the time of exiting the corner, the adjustment adjustment of the engine output by the output adjusting means 22 is stopped and the engine output is increased by that amount, so that the acceleration start-up performance is improved, After that, the opening degree of the throttle valve 6 increases according to the accelerator operation amount by the driver, and the engine output further increases.
Good acceleration of the vehicle will be achieved.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings starting from FIG.

FIG. 2 shows the overall configuration of an engine control device according to the present invention. 1 is an engine, 2 is one end open to the atmosphere through an air cleaner 3, and the other end is open to the engine 1 so that intake air (air ) Is an exhaust passage through which one end is opened to the engine 1 and the other end is opened to the atmosphere to exhaust the exhaust gas from the engine 1. 5 is an accelerator pedal that is operated by a driver in response to an engine output request,
Reference numeral 6 denotes a throttle valve which is disposed in the intake passage 2 and controls the intake air amount. The throttle valve 6 has no mechanical connection with the accelerator pedal 5, and the depression amount of the accelerator pedal 5 ( It is electrically controlled by the accelerator operation amount). Reference numeral 7 is a throttle actuator including a step motor or the like as a driving means for opening and closing the throttle valve 6. Reference numeral 8 denotes a catalyst device provided in the exhaust passage 4 for purifying exhaust gas.

In addition, one end of the exhaust gas 9 is opened upstream of the catalyst device 8 in the exhaust passage 4, and the other end is opened downstream of the throttle valve 6 in the intake passage 2 to recirculate a part of the exhaust gas in the exhaust passage 4 to the intake passage 2. An exhaust gas recirculation passage, 10 is provided in the middle of the exhaust gas recirculation passage 9, and is a recirculation control valve including a diaphragm device that controls the amount of exhaust gas recirculation and uses an intake negative pressure as an operating source, and 11 is the recirculation control valve.
This is a solenoid valve that controls the opening and closing of 10.

Further, reference numeral 12 is a fuel injection valve which is arranged downstream of the throttle valve 6 in the intake passage 2 to inject and supply fuel, and the fuel injection valve 12 has a fuel supply passage 15 provided with a fuel pump 13 and a fuel filter 14. Is communicated with the fuel tank 16 via, and the fuel from the fuel tank 16 is charged,
The surplus fuel is recirculated to the fuel tank 16 through the return passage 18 provided with the fuel pressure regulator 17, so that the fuel having a predetermined pressure is supplied to the fuel injection valve 12.

Further, reference numeral 20 denotes an ignition plug for igniting the air-fuel mixture supplied to the engine 1 based on the fuel from the fuel injection valve 12 at a set ignition timing. The ignition plug 20 has an ignition plug for adjusting the ignition timing. A timing controller 21 is connected, and the ignition timing of the ignition plug 20 is adjusted by the ignition timing controller 21 to change the combustion state of the air-fuel mixture, and the engine output is increased or decreased separately from the throttle valve 6. The adjusting means 22 is configured.

On the other hand, 25 is an accelerator pedal position sensor that detects the amount of depression of the accelerator pedal 5, that is, the amount of accelerator operation, 26 is an air flow sensor that is arranged upstream of the throttle valve 6 in the intake passage 2 and that detects the amount of intake air, and 27 is the same intake air intake sensor. An intake air temperature sensor arranged upstream of the throttle valve 6 in the passage 2 for detecting the intake air temperature, 28 a throttle position sensor for detecting the opening of the throttle valve 6, 29 a water temperature sensor for detecting the temperature of engine cooling water, 30 Is an O ₂ sensor which is arranged upstream of the catalyst device 8 in the exhaust passage 4 and detects the air-fuel ratio of the engine 1 from the oxygen concentration component in the exhaust gas. 31 is a recirculation valve that is attached to the recirculation control valve 10 and detects the recirculation of exhaust gas. Sensor, 32
Is a rotation speed sensor for detecting the engine rotation speed, and 33 is a steering angle sensor for detecting the steering angle of the steering wheel. The detection signals of these sensors 25 to 33 are input to a throttle valve controller 34 that operates the throttle actuator 7, and a control unit 40 including a CPU that controls the operation of the spark plug 20 and the fuel injection valve 12. Furthermore, the control unit 40 also includes a battery 41
Is connected to, and the signal of the battery voltage is input.

Then, the control unit 40 controls the throttle actuator 7 to adjust the opening degree of the throttle valve 6 and controls the ignition timing of the spark plug 20,
Further, the fuel injection amount from the fuel injection valve 12 is controlled according to the operating state of the engine 1.

Next, the control of the opening degree of the throttle valve 6 and the ignition timing control of the spark plug 20 by the control unit 40
A description will be given based on the control flow in the figure. First, the accelerator pedal position Acc in step S _1, after entering the respective signals of the throttle valve opening TVO and the handle steering angle St, normal target throttle valve opening of the straight or the like is not a cornering of the vehicle in step S ₂ Degree T is the preset target opening map of FIG. 4, that is, accelerator pedal opening Acc (accelerator operation amount)
Based on the characteristics of the target throttle valve opening degree T is increased according to the increase, to calculate the value T ₁ which increases with an increase in accelerator pedal opening Acc, the normal time of straight running such as at Step S ₃ The ignition timing θ is calculated based on the target ignition timing map of FIG. 5 to a value θ ₁ on the advance side in accordance with an increase in the engine speed and an increase in the throttle valve opening.

Then, in step S ₄ , the value of the steering wheel steering angle St from the steering angle sensor 33 is compared with the steering wheel steering angle St ₀ corresponding to when the vehicle is cornering, and when ST ≧ St ₀ is YES when the vehicle is entering a corner. First, in order to open the opening of the throttle valve 6 by a predetermined opening than the opening corresponding to the accelerator pedal opening Acc at that time based on the above target opening map,
At S ₅ , the ignition timing θ of the spark plug 20 is subtracted from the calculated timing θ ₁ by a minute time θ ₀ and retarded, and the engine output is reduced by the retard of this ignition timing θ, and at the same time, at S _{6 the} engine The minute opening ΔT is added to the target throttle valve opening T to compensate for the decrease in the output.

After that, in step S ₇ , the step of returning the steering wheel based on the change in the steering wheel steering angle St from the steering angle sensor 33 is performed.
Each whether accelerator pedal opening Acc or the predetermined value K ₁ or more corresponding to a predetermined load, also predetermined value K ₂ or more the rate of change DACC / dt of the accelerator pedal opening degree corresponding to the time of acceleration request in step S ₉ in S ₈ discriminated, when one of the determination is NO, it is determined that the middle cornering, immediately proceeds to step S _12, the throttle actuator outputs a target throttle valve opening degree T to the throttle valve controller 34 in the step S ₁₂ 7 by controlling the, with adjusting the opening degree of the throttle valve 6 to the target value T, and outputs the target ignition timing θ to the ignition timing controller 21 at step S _13, the target value of the ignition timing of the ignition plug 20 Adjust to θ.

On the other hand, if the determination of step S ₇ to S ₉ are all YES, together with the normal running of the straight or the like which is determined NO in step S _4, and when acceleration is requested at the time of the corner escape vehicle determination the process proceeds to step S ₁₀ and the ignition in the step S ₁₀ plug 20
The target ignition timing θ is advanced to return to the normal value θ ₁ , the engine output is increased correspondingly, and the increment of the target throttle valve opening T (small opening ΔT) is set to a zero value in step S _11. Then, the target throttle valve opening T is returned to the normal value T ₁ corresponding to the accelerator operation amount of the target opening map of FIG.
Thereafter, the process proceeds to step S ₁₂ and later, respectively each desired value T, the ignition timing of the opening and the ignition plug 20 of the throttle valve 6, is adjusted to theta, returns.

Therefore, in the control flow of FIG.
S ₄ constitutes a corner entry detection unit 45 that detects the entry of the vehicle into a corner based on the steering angle St. Further, in steps S ₅ , S ₆ , S ₁₂ , and S ₁₃ , the output of the corner entry detecting means 45 is received, and the throttle valve 6 is received.
The throttle actuator 7 is controlled so as to open a predetermined opening (small opening ΔT) from a preset opening corresponding to the accelerator operation amount at that time, and the ignition timing of the ignition plug 20 is set to the normal value θ ₁ Set to the retard side for a smaller time θ ₀ than in order to reduce the engine output,
The corner entry control means 46 is configured to control the output adjustment means 22. Furthermore, from the step S ₇ to S _9,
Corner escape detection means 47 for detecting when a vehicle has escaped from a corner
Together constitute a, in step S _10, S _13, receiving the output of said corner the escape detection means 47, spark plugs 20
The corner escape control means 48 is configured to stop the control of the output adjustment means 22 by the corner entry control means 46 so that the ignition timing is returned to the normal value θ ₁ and the engine output reduction adjustment is canceled. are doing.

Therefore, in the above embodiment, when the vehicle enters a corner, the accelerator operation amount is kept small by the driver, but the opening degree T of the throttle valve 6 depends on the accelerator pedal operation amount by the corner entry control means 46. The ignition timing θ of the ignition plug 20 is controlled so as to open the engine by a predetermined opening ΔT (T = T ₁ + ΔT) larger than the normal value T _{1 and} to control the increase of the engine output due to the expansion of the throttle valve 6.
Is set to the retard side for a minute time θ ₀ smaller than the normal value θ _1, so that the vehicle is smoothly cornering without causing a sudden change in the engine output, and the throttle valve 6
Is opened by a predetermined opening ΔT from the normal value T ₁ to prepare for the start of acceleration operation at the corner escape.

When the vehicle is out of the corner and the accelerator pedal 5 is stepped on by the driver, the ignition timing θ of the ignition plug 20 is returned to the normal value θ ₁ by the out-of-corner control means 48, and the air-fuel mixture is burned. Since the state quickly becomes good, the engine output increases faster than the conventional expansion operation of the throttle valve 6 by the throttle actuator 7, and the acceleration start-up performance improves.

Then, after that, the throttle valve opening T is adjusted to a predetermined value according to the accelerator operation amount by stopping the increase control of the predetermined opening ΔT, and gradually increases as the accelerator operation amount increases. Acceleration performance according to the driver's intention can be obtained.

Therefore, enhance the rising performance of acceleration when exiting a corner,
Acceleration performance can be improved.

In the above embodiment, when the corner escapes, the increment ΔT of the throttle valve opening T is immediately set to zero and returned to the normal value.
Preferably, the throttle valve opening characteristic during normal operation such as straight running (see FIG. 4) and the throttle valve opening characteristic during cornering in which the opening ratio with respect to the accelerator pedal opening is larger than this opening characteristic Two types are set in advance, and when the vehicle exits the corner, the selection of the throttle valve opening characteristic at the time of cornering is held for a set time even after the ignition timing is restored, and then the opening T of the throttle valve 6 is gradually corrected. Then, by returning to the throttle valve opening characteristic at the time of normal operation, the rising performance of acceleration can be further enhanced.

Further, in the above embodiment, the output adjusting means 22 for adjusting the engine output separately from the throttle valve 6 is constituted by adjusting the ignition timing, but in addition, it is constituted by adjusting the exhaust gas recirculation amount to the engine 1. Good.

(Effects of the Invention) As described above, according to the engine control device of the present invention, when the vehicle enters a corner, the throttle valve opening is set to be smaller than the normal value while maintaining the engine output at substantially the same value in advance. By widening the opening by a predetermined amount to prepare for the operation to increase the throttle valve opening when the vehicle exits the corner, the acceleration when exiting the corner is irrelevant regardless of the response delay of the actuator for controlling the opening of the throttle valve. It is possible to improve the start-up performance of the vehicle and improve the acceleration performance.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of the present invention. 2 to 5 show an embodiment of the present invention, FIG. 2 is an overall schematic diagram, FIG. 3 is a flow chart showing the operation of the control unit, and FIG. 4 is a target throttle valve opening map. 5 and 5 are diagrams showing a target ignition timing map. 1 ... Engine, 5 ... Accelerator pedal, 6 ... Throttle valve, 7 ... Throttle actuator, 20 ... Spark plug, 21 ... Ignition timing controller, 22 ... Output adjusting means, 25 ... Accelerator pedal position sensor , 28 ……
Throttle position sensor, 33 ... Rudder angle sensor, 40 ...
... control unit, 45 ... corner entry detection means, 46 ... corner entry control means, 47 ... corner exit detection means, 48 ... corner exit control means.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Go Furushima 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Mazda Co., Ltd. (56) Reference JP 61-16136 (JP, A) JP 60- 209640 (JP, A)

Claims (1)

[Claims] 1. A control device for an engine, which electrically controls the opening of a throttle valve based on a preset characteristic in accordance with an accelerator operation amount, comprising drive means for driving the throttle valve, and the throttle. Output adjustment means for adjusting the engine output separately from the valve, corner entry detection means for detecting the entry of the vehicle into a corner, and the throttle valve's accelerator operation at that time in response to the output of the corner entry detection means A corner entry control means for controlling the drive means so as to open a predetermined opening larger than a preset opening corresponding to the amount, and for controlling the output adjusting means for reducing the engine output; and a corner of the vehicle. The corner entry time control means for detecting the corner exit detection means and the corner entry time control means for receiving the output of the corner escape time detection means to cancel the decrease adjustment of the engine output. The engine control apparatus being characterized in that a corner escape-time control means for stopping the control output adjustment means by means.