JP3562938B2 - Throttle valve control device for internal combustion engine - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a throttle valve control device for an internal combustion engine having an electronically controlled throttle valve. In particular, the present invention performs learning to calculate the control reference position from the output value of the throttle sensor when the throttle valve is at the reference position when the ignition is turned on and store the control reference position as a reference position learning value. The present invention relates to a throttle valve control device for an internal combustion engine that controls a valve.
[0002]
[Prior art]
Conventionally, it has been known that a throttle valve of an internal combustion engine is electronically controlled by an actuator including a DC motor and an electromagnetic clutch. In the electronically controlled throttle valve control system, the control reference position is learned when the ignition is turned on (IG-ON). That is, the control reference position (control origin) of the throttle valve is calculated from the output of the throttle sensor when the throttle valve is at the reference position at the time of IG-ON, and is stored as a reference position learning value. Then, the throttle valve is controlled based on the stored reference position learning value.
[0003]
In addition, when learning before starting the engine is not executed for some reason and the throttle valve is directly controlled, the reference position learning value at the previous execution of the previous learning (previous value) is adopted as the reference position learning value of the current throttle control. It is also known to carry out such operations (for example, JP-A-7-269406).
[0004]
[Problems to be solved by the invention]
However, an error may occur in the reference position learned value learned at the time of IG-ON due to the influence of a temperature characteristic of the throttle sensor, a deviation of a mechanical reference position of the throttle valve (opener, fully closed stopper, fully opened stopper), and the like. . For example, when the temperature of the throttle sensor decreases due to the traveling wind caused by the traveling of the vehicle, the reference position learned at the time of IG-ON may shift during driving. In such a case, the engine speed may decrease during deceleration during traveling, causing an engine stall.
[0005]
Further, when the vehicle travels while adopting the reference position learning value at the time of the previous learning execution as the reference position learning value at the time of IG-ON, a similar problem occurs due to an error in the reference position learning value due to the temperature characteristics of the throttle sensor and the like.
[0006]
SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and aims to (1) increase the reference position learning value during running of a vehicle so that the throttle position is not significantly affected by vehicle behavior. Prevents a decrease in the engine speed during vehicle deceleration caused by an error due to the influence of the temperature characteristics of the sensor, etc. (2) Prevents an increase in the engine speed during idling operation due to excessive raising and a shift in the learning term of ISC control. Another object of the present invention is to provide (3) a throttle valve control device for an internal combustion engine that can prevent an engine speed from rising more than necessary when an accelerator pedal is depressed to a predetermined opening or more.
[0007]
[Means for Solving the Problems]
A throttle valve control device for an internal combustion engine according to the present invention is a throttle valve control device for an internal combustion engine having an electronically controlled throttle valve, the output value of the throttle sensor when the throttle valve is at a reference position when the ignition is turned on. And a control means for controlling the throttle valve based on the reference position learning value, and further comprising: a control means for controlling the throttle valve based on the reference position learning value. Determining means for determining whether or not the vehicle is running, and correcting means for setting a value obtained by raising the reference position learning value as a reference position learning value when it is determined that the vehicle is traveling. Achieved.
[0008]
Further, the control means performs feedback control of the throttle valve opening so that the engine speed during idling becomes the target speed, and the correction means performs the feedback control during the feedback control when it is determined that the vehicle is running. The raising amount of the raised reference position learning value is attenuated to become the reference position learning value , thereby achieving the object (2).
[0009]
Further, the correcting means sets the raising amount to zero when the accelerator opening becomes equal to or more than a predetermined value, whereby the object (3) is achieved.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0011]
FIG. 1 schematically shows a configuration of a throttle valve control device 100 for an internal combustion engine according to the present invention. As shown in FIG. 1, in a throttle valve control device 100, a throttle valve 10 is driven by a computer (ECU) 17 controlling a DC motor 11 and a clutch 12 that transmits a driving force of the DC motor 11 to the throttle valve 10. Is done. The ECU 17 receives output values from various sensors (a rotation speed sensor Ne, a water temperature sensor THw, an air amount sensor, etc.) in addition to an accelerator opening sensor that detects the amount of depression of an accelerator pedal (actual accelerator opening AP). Is done.
[0012]
The actual throttle opening (actual throttle opening) TA is detected by the throttle sensor 13 and fed back to the ECU 17 as a throttle sensor signal. The ECU 17 performs feedback control of the DC motor 11 so that the actual throttle opening TA becomes the final target opening TANGL. When the clutch 12 is in the disengaged state (OFF state), the throttle valve 10 is urged by the spring 15 so as to contact the opener 14 (opener position). The throttle fully closed position when the throttle valve 10 is controlled to be closed is defined by a throttle fully closed stopper 16 (throttle fully closed position).
[0013]
First, the throttle control will be described. FIG. 2 is a flowchart showing the throttle control in the present embodiment.
[0014]
As shown in FIG. 2, first, in step S10, an ISC required opening degree by ISC (Idle Speed Control) control is calculated. Here, the ISC required opening is calculated as an addition value of the ISC learning amount, the ISC feedback control amount, the expected shift amount, the estimated air conditioner amount, the water temperature correction amount, the estimated electric load amount, and other estimated amounts.
[0015]
In step S11, a required opening other than the ISC required opening is calculated based on the driving state and the control state of the vehicle. For example, a non-linear required opening based on the actual accelerator opening AP corresponding to the driver's accelerator operation, a TRC required opening based on traction control, a cruise required opening based on cruise control, a VSC required opening based on vehicle behavior control, a shift Shift required opening at the time.
[0016]
In step S12, a final target opening degree TANGL for the throttle valve 10 is calculated from the ISC required opening degree calculated in steps S10 and S11 and other required opening degrees. For example, during normal traveling, the value is the sum of the ISC required opening and each required opening, and during ISC control, the ISC required opening becomes the final target opening TANGL as it is.
[0017]
In step S13, the final target opening degree TANGL is converted into a corresponding required voltage TAP. Usually, the required voltage TAP is obtained by multiplying the final target opening degree TANGL by a predetermined conversion coefficient.
[0018]
In step S14, a control voltage TTP for driving the DC motor 11 is calculated by adding a reference position serving as a reference for throttle control to the required voltage TAP. Then, by controlling the DC motor 11, the throttle valve 10 is driven to the final target opening degree TANGL.
[0019]
As described above, since the throttle valve 10 is controlled with reference to the reference position in step S14, usually, learning of the reference position is performed before the engine is started.
[0020]
Hereinafter, learning of the reference position before the engine is started (at the time of IG-ON) in the throttle valve control device 100 for the internal combustion engine according to the present embodiment will be described.
[0021]
FIG. 3 is a flowchart illustrating a reference position learning routine in throttle valve control device 100 of the present embodiment. As shown in FIG. 3, first, in step S20, ON / OFF of an ignition switch (IG) is determined. In the case of IG-ON, it is determined in step S21 whether reference position learning has been completed. This determination is made, for example, by turning on / off a learning completion flag (described later). If the learning completion flag is ON in the determination in step S21 and the reference position learning has been completed, this routine ends.
[0022]
If the learning completion flag is not ON in the determination in step S21, the process proceeds to step S22, and the learning counter is incremented. Then, to determine the value of learning counter in step S23, the value of learning counter is the case of the above T _1, a predetermined time (T ₁₎ learning elapsed despite the reference position is not performed, the learning is not satisfied The reference position learning value (previous value) at the time of the previous learning execution is adopted (step S30), and this routine ends.
[0023]
If in step S23 the value of the learning counter is _{T 1} or less, it determines whether the value of learning counter is _{T 0} or more in the next step S24 _(except, T 0 _{<T 1).} Further, in step S25, it is determined from the output of the accelerator opening sensor whether the accelerator is depressed (accelerator opening AP <predetermined value), and in step S26, it is determined whether the throttle sensor 13 is normal. If all the determinations in steps S24 to S26 are affirmative, the current output (throttle opening TA) of the throttle sensor 13 is set as a reference position (step S27). That is, the control reference position is calculated from the output value of the throttle sensor 13 at the position of the throttle valve 10 (in this case, the opener position) before the engine is started (at the time of non-control), and stored as reference position learning.
[0024]
If any one of the determinations in steps S24 to S26 is negative, this routine ends without performing the subsequent processing.
[0025]
After execution of step S27, it determines whether or not the value of learning counter is T ₁ in step S28. If the value of the learning counter is T _1, and ends the reference position learning routine as ON the learning completion flag in step S29. The value of learning counter is determined in step S28 is not the T _1, the routine ends without learning completion flag turned ON.
[0026]
As described above, after the IG-ON, the reference position learning is performed in a range where the value of the learning counter is “T ₀ <counter value <T ₁ ”. Here, T ₀ is the time until the sensor supply after power is stabilized, is provided to prevent erroneous learning by variation of each sensor output at the time of rise of the sensor power supply. Further, T ₁ is a predetermined time width after the lapse of T ₀ , and during this time, it is a time for detecting each sensor output several times to ensure learning. If the learning completion flag has not been turned on even though the predetermined time (T ₁ ) has elapsed, the previous reference position learning value is adopted (step S30).
[0027]
Next, the process of raising the reference position learning value according to one embodiment of the present invention will be described. According to the present embodiment, after the throttle control is started, the reference position is corrected as follows. FIG. 4 is a flowchart showing a routine for raising the reference position learning value of the throttle control according to one embodiment of the present invention. As shown in FIG. 4, first, in step S40, it is determined whether or not the raising process is being performed. If the raising process is being executed, the process jumps to a raising amount attenuation routine (to be described later) after step S50.
[0028]
If the raising process has not been performed in the determination in step S40, it is determined in steps S41 to S43 whether the conditions for executing the raising process (the vehicle is running and the ISC control is not being performed) are satisfied. . When the vehicle is running, raising the reference position of the throttle control has little effect on the vehicle behavior.
[0029]
In this determination, first, it is determined whether or not the vehicle speed is higher than a predetermined value in step S41, and it is determined whether or not the engine speed Ne is higher than a predetermined value in step S42. Then, in a step S43, it is determined whether or not the ISC control is being executed. If the determinations in steps S41 and S42 are affirmative and the determination in step S43 is negative, a raising process is performed in step S44.
[0030]
In step S44, the reference position learned value learned at the time of IG-ON (or the reference position set by adopting the previous value) is used as the base reference position, and the raising amount α is added to this base reference position to thereby throttle the throttle. A control reference position used for control is obtained. After the execution of the raising process in step S44, the raising flag is turned ON in step S45, and the current routine ends. That is, after the execution of the raising process in step S44, the determination in step S40 from the next routine indicates that the raising is being performed.
[0031]
If the result of the determination in step S40 is that raising is being performed, the raising amount is attenuated as follows.
[0032]
First, in step S50, it is determined whether or not the accelerator is depressed. This determination is made based on, for example, whether the accelerator opening AP obtained from the accelerator opening sensor is smaller than a predetermined value. When the accelerator opening AP is equal to or greater than a predetermined value, that is, when the accelerator is depressed, the raising amount is set to “0”. That is, in step S55, the control reference position is set as the base reference position. Thus, when the accelerator is depressed by the driver during traveling or during deceleration from the traveling state, it is possible to prevent the engine speed from excessively increasing due to raising.
[0033]
After the control reference position is set to the base reference position in step S55, the raising execution flag is cleared (OFF) in step S56, and this routine ends.
[0034]
If it is determined in step S50 that the accelerator opening AP is smaller than the predetermined value, it is determined in step S51 whether or not the ISC feedback control is being performed. Further, in step S52, the rotation of the engine is stable (ie, the engine rotation speed). Ne is determined to be sufficiently small).
[0035]
If any one of the determination results in steps S51 and S52 is negative, this routine ends without performing the subsequent processing.
[0036]
If the results of the determinations in steps S51 and S52 are both positive, that is, if the ISC feedback control is currently being performed and the rotation of the engine is stable, a damping process of the raising amount α is executed in steps S53 and S54.
[0037]
First, in step S53, a predetermined amount β (where β <α) is subtracted from the current control reference position (control reference position _i ), and it is determined whether the value is greater than the base reference position. If the subtracted value is larger than the base reference position, in step S54, the current control reference position is calculated by subtracting a predetermined amount β from the previous control reference position (control reference position _i-1 ). That is, the corresponding current raising amount α _i is attenuated to a value obtained by subtracting the predetermined value β from the previous raising amount α _i−1 , and this routine ends.
[0038]
If the value subtracted in step S53 is equal to or smaller than the base reference position, it is determined that the damping process of the raising amount has been completed, the control reference position is set to the base reference position in step S55, and the raising is executed in step S56. The flag is cleared (OFF), and this routine ends.
[0039]
The control reference position, which has been raised, is returned to the base reference position during execution of the ISC feedback control by the attenuation processing of the raising amount. This prevents the amount of raising from being absorbed into the learning term of the ISC feedback control.
[0040]
Next, the throttle control according to the present embodiment will be described in comparison with a conventional throttle valve control device without a raising process.
[0041]
FIGS. 5A to 5E are timing charts showing throttle control by a conventional throttle valve control device. As shown in FIG. 5 (c), in the conventional throttle valve control device, the control reference position learned at the time of IG-ON is continuously used without performing the raising process. After the IG-ON, as shown in FIG. 5B, it is assumed that the temperature of the throttle sensor has decreased due to the traveling wind or the like caused by the traveling of the vehicle. In this case, when the vehicle is decelerated from the running state (FIGS. 5A and 5D), the throttle valve 10 is controlled to close due to an error in the reference position due to the temperature characteristics of the throttle sensor 13 and the like, and the throttle is opened. A deviation (Δθ) occurs in the degree TA. Due to the deviation (Δθ) of the throttle opening TA, the engine speed Ne decreases more than necessary, and in some cases, engine stall occurs (FIG. 5E).
[0042]
FIGS. 6A to 6E are timing charts showing throttle control for performing raising processing in the throttle valve control device according to one embodiment of the present invention. As shown in FIG. 6C, at the time when it is determined that the vehicle is in the traveling state (the above-described steps S41 to S43), the control reference position learned at the time of IG-ON is raised by a predetermined raising amount α. Is done.
[0043]
Therefore, after the IG-ON, even if deceleration (FIGS. 6A and 6D) is performed in a state where the temperature of the throttle sensor is lowered (FIG. 6B) due to the running of the vehicle, the temperature of the throttle sensor 13 is maintained. It is possible to prevent a decrease in the engine speed Ne due to an error in the reference position due to characteristics or the like (FIG. 6E). Further, as shown in FIG. 6 (c), when the ISC feedback control is performed after the deceleration (and the engine speed Ne is in a stable state), the raising amount is gradually attenuated, so that the idling operation is performed. Excessive increase in the engine speed Ne at the time can be prevented.
[0044]
【The invention's effect】
As described above, according to the throttle valve control device for an internal combustion engine of the present invention, by raising the reference position of the throttle control during running of the vehicle, the temperature characteristic of the throttle sensor is not significantly affected by the vehicle behavior. It is possible to prevent a decrease in the engine speed at the time of engine deceleration caused by an error due to the influence of the above.
[0045]
Further, by attenuating the raising amount when the engine speed during the ISC control is stabilized, it is possible to prevent an increase in the engine speed during idling operation due to excessive raising and a deviation of a learning term of the ISC control. it can.
[0046]
Furthermore, when the accelerator pedal is depressed beyond a predetermined opening degree, the lift amount is set to zero, thereby preventing the engine speed from unnecessarily increasing when the accelerator is depressed.
[Brief description of the drawings]
FIG. 1 is a diagram showing a schematic configuration of a throttle valve control device for an internal combustion engine according to one embodiment of the present invention.
FIG. 2 is a flowchart showing throttle control according to one embodiment of the present invention.
FIG. 3 is a flowchart showing a reference position learning routine in the throttle valve control device according to the embodiment.
FIG. 4 is a flowchart showing a routine for raising a reference position learning value for throttle control according to one embodiment of the present invention;
FIGS. 5A to 5E are timing charts showing throttle control by a conventional throttle valve control device.
FIGS. 6A to 6E are timing charts showing throttle control for performing a raising process in a throttle valve control device according to one embodiment of the present invention.
[Explanation of symbols]
Reference Signs List 10 Throttle valve 11 DC motor 12 Clutch 13 Throttle sensor 14 Opener 15 Spring 16 Throttle fully closed stopper 17 ECU
100 Throttle valve control device

Claims (3)

A throttle valve controller for an internal combustion engine having an electronically controlled throttle valve, the throttle valve controller comprising:
Learning means for calculating a control reference position from the output value of the throttle sensor when the throttle valve is at the reference position when the ignition is turned on and storing the control reference position as a reference position learning value; Control means for controlling the valve,
Determining means for determining whether or not the vehicle is running;
Correction means for setting a value obtained by raising the reference position learning value as a reference position learning value when it is determined that the vehicle is traveling;
Has,
A throttle valve control device for an internal combustion engine. The control means performs feedback control of the throttle valve opening so that the engine speed during idling becomes the target speed,
Said correction means during the feedback control, raising the amount of raising the reference position learning value attenuates the reference position learning value when it is determined that the time the vehicle is running,
The throttle valve control device for an internal combustion engine according to claim 1. The throttle valve control device for an internal combustion engine according to any one of claims 1 and 2, wherein the correction means sets the raising amount to zero when the accelerator opening is equal to or more than a predetermined value.

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