JP3783433B2 - Throttle control device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a throttle control device, and more particularly to a throttle control device including an electrically operated throttle valve.
[0002]
[Prior art]
A vehicle engine is provided with an accelerator device that detects an accelerator pedal depression amount as an accelerator operation amount and electrically operates a throttle valve based on an accelerator opening command value based on the accelerator operation amount. There is.
[0003]
In this accelerator control device, an accelerator sensor for detecting the accelerator operation amount and a vehicle speed sensor for detecting the vehicle speed are provided, and an accelerator opening command value AC based on the accelerator operation amount and a vehicle speed correction opening command value based on the vehicle speed are provided. and SP, also by the idle control request partial opening degree command value iS based on the calculated value of the idle speed control (ISC), the final throttle opening command value TV, seeking in TV = AC + I S -SP. Here, 0 ≦ TV. In other words, the limit vehicle speed is set to a value obtained by adding the accelerator opening command value AC and the idle control request opening command value IS, but when the actual vehicle speed exceeds the limit vehicle speed, the vehicle speed correction opening command value is set. S is used to correct the throttle opening command value TV.
[0004]
A throttle control device that operates the electrical throttle valve in this way is disclosed in, for example, Japanese Patent Laid-Open No. 10-37771. In this publication, the target throttle opening is set based on the accelerator operation amount, the throttle valve is operated so as to be the target throttle opening, and the presence / absence of specific engine control is controlled. In this case, the setting characteristic of the accelerator operation amount and the target throttle opening is changed, and the same acceleration feeling is obtained with the same accelerator operation amount as in the case of no control.
[0005]
[Problems to be solved by the invention]
Conventionally, in determining the final throttle opening command value TV for operating the throttle valve, the vehicle speed correction amount opening command value SP changes only depending on the vehicle speed state. There is no correlation with the required opening command value IS, and therefore the vehicle speed increases, the vehicle speed correction opening command SP becomes excessive, and the accelerator opening command value AC and the idle control required opening command value IS are added. If it becomes larger than the added value, the final throttle opening command value TV becomes TV = 0. Therefore, at this time, the engine exceeds the state where the output required for the maximum speed control is reduced. As a result, the air-fuel mixture becomes too thin and misfires occur.
[0006]
[Means for Solving the Problems]
Therefore, in order to eliminate the above-described inconvenience, the present invention is provided with an accelerator sensor for detecting the accelerator operation amount and a vehicle speed sensor for detecting the vehicle speed, and at least the accelerator opening degree command value based on the accelerator operation amount and the vehicle speed In a throttle control device that electrically operates a throttle valve in accordance with a throttle opening command value in consideration of a vehicle speed correction opening command value based on the above, when the vehicle speed exceeds a set value, the throttle opening command value Control means for operating the throttle valve by reflecting the vehicle speed correction opening degree command value only in the accelerator opening degree command value is provided , and the control means provides the vehicle speed correction opening degree command value when the vehicle speed is equal to or higher than a first set value. When the vehicle speed is less than the second set value that is set to a value smaller than the first set value, the vehicle speed correction opening degree command value is increased. Characterized in that it decreases with between.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
According to the present invention, it is possible to avoid the occurrence of misfiring in the engine even at the highest speed control, and to moderate the change in the engine output at the highest speed control and reduce the shock.
[0008]
【Example】
Embodiments of the present invention will be described in detail and specifically with reference to the drawings. 1 to 5 show an embodiment of the present invention. In FIG. 2, 2 is an engine mounted on a vehicle (not shown), 4 is an intake passage, 6 is an intake manifold, 8 is an intake valve, 10 is an exhaust passage, 12 is an exhaust manifold, 14 is an exhaust valve, 16 is It is a spark plug.
[0009]
The intake passage 4 is provided with a throttle valve 18 that is electrically opened and closed. The throttle valve 18 is operated by a throttle drive motor 20. The throttle drive motor 20 is driven by the final throttle opening command value TV calculated by the control means 22.
[0010]
The control means 22 includes an accelerator sensor 26 that detects an accelerator operation amount that is a depression amount of an accelerator pedal 24, a vehicle speed sensor 28 that detects a vehicle speed, a rotation speed sensor 30 that detects an engine speed, and a coolant temperature. The water temperature sensor 32 that detects the above is in communication.
[0011]
The control means 22 obtains the accelerator opening degree command value AC based on the accelerator operation amount from the accelerator sensor 26 (see FIG. 5), and obtains the vehicle speed correction opening degree command value SP based on the vehicle speed from the vehicle speed sensor 28. Furthermore, an idle control (ISC) required opening degree command value IS is obtained based on the engine speed from the speed sensor 30 (see FIG. 3), and when the vehicle speed exceeds the set value (Vmax), the vehicle speed correction amount opening degree command value I S to the throttle opening command value TV to reflect only the accelerator partial opening degree command value AC, and finally calculates the throttle opening command value TV, i.e., TV = (AC-SP) + IS, where TV ≧ 0 and (AC−SP) ≧ 0, and this throttle opening command value TV is output to the throttle drive motor 20.
[0012]
Further, in the control means 22 is for controlling the vehicle speed correction amount opening degree command value SP in the vehicle speed state, as shown in FIG. 4, when the vehicle speed VSP is in the first set value V ₁ or more optional, vehicle speed correction The initial value of the minute opening command value SP is set to zero (0), and the vehicle speed corrected minute opening command value SP is increased step by step by a predetermined amount ST ₁ every predetermined time T ₁ , while the vehicle speed VSP is the first speed. When it is less than the second set value V ₂ set to be smaller than the set value V ₁ , the vehicle speed corrected opening degree command value SP is decreased step by step by a predetermined amount ST ₂ every predetermined time T ₂ . However, in this case, SP ≧ 0.
[0013]
The control means 22 performs idle speed control (ISC) for adjusting the amount of air supplied during idling operation of the engine 2 by opening and closing the throttle valve 18 so that the vehicle speed does not exceed a predetermined set vehicle speed. The throttle valve 18 is operated to adjust the amount of air to the engine 2.
[0014]
Next, the operation of this embodiment will be described based on the flowchart of FIG.
[0015]
In the control means 22, the accelerator opening degree command value AC is obtained based on the accelerator operation amount from the accelerator sensor 26, the vehicle speed correction opening degree command value SP is obtained based on the vehicle speed from the vehicle speed sensor 28, and Based on the engine speed from the engine speed sensor 30, the idle control required opening command value IC is obtained.
[0016]
When the program starts (step 102), first, it is determined whether or not the vehicle speed V is equal to or higher than a set value (for example, a preset maximum speed: Vmax) (step 104).
[0017]
If this step 104 is YES and the vehicle speed is quite high, the vehicle speed corrected opening command value SP for the throttle opening command value TV is reflected only in the accelerator opening command value AC, that is, the throttle opening command value TV is , TV = (AC−SP) + IS (step 106). However, TV ≧ 0 and (AC-SP) ≧ 0.
[0018]
Then, the throttle opening command value TV is output to the throttle drive motor 20, and the throttle drive motor 20 is driven to operate the throttle valve 18.
[0019]
Then, the program is returned (step 108).
[0020]
On the other hand, if the vehicle speed V is lower than the set value in step 104, the throttle opening command value TV is calculated by TV = AC + IS, and this throttle opening command value TV is output to the throttle drive motor 20 to Output to the drive motor 20, the throttle valve 18 is operated (step 110 ), and the vehicle speed is set to the limit vehicle speed.
[0021]
Then, the program is returned (step 108).
[0022]
As a result, even if the vehicle speed rises and the vehicle speed correction opening command value SP becomes excessive when the vehicle speed is higher than the set value, the minimum value of the throttle opening command value TV becomes the idle control request command value IS, that is, TV = Thus, for example, the engine 2 can be prevented from misfiring without exceeding the state where the output required for the maximum speed control is reduced.
[0023]
Further, since the control means 22 operates the throttle valve 18 via the throttle drive motor 20, the throttle opening command value TV can be arbitrarily set with respect to the accelerator opening command value AC based on the accelerator operation amount. The degree of freedom of operation control of the throttle valve 18 can be increased.
[0024]
Further, since the throttle valve 18 is operated so that the vehicle speed does not exceed a predetermined set vehicle speed, a change in the engine output during the maximum speed control can be moderated and a shock can be reduced.
[0025]
In this embodiment, a plurality of throttle opening command values to be output to the throttle drive motor when the vehicle speed is equal to or higher than the set value are stored in the memory of the control means, and the vehicle speed is equal to or higher than the set value and matches the vehicle speed at that time. It is also possible to select the throttle opening command value and output the selected throttle opening command value to operate the throttle valve.
[0026]
【The invention's effect】
According to the present invention as apparent from the detailed description above, even at maximum speed control, without throttle opening command value becomes zero, and obtained by avoiding the misfire in the engine occurs, also, the outermost Changes in engine output during high-speed control can be moderated to reduce shock .
[Brief description of the drawings]
FIG. 1 is a flowchart of throttle control.
FIG. 2 is a system configuration diagram of a throttle control device.
FIG. 3 is a diagram for obtaining an idle control required opening command value with respect to an engine speed.
FIG. 4 is a diagram of control of a vehicle speed correction opening command value.
FIG. 5 is a diagram for obtaining an accelerator opening degree command value.
[Explanation of symbols]
2 Engine 4 Intake passage 18 Throttle valve 20 Throttle drive motor 22 Control means 26 Accelerator sensor 28 Vehicle speed sensor 30 Speed sensor

Claims (2)

A throttle opening command that includes an accelerator sensor that detects an accelerator operation amount and a vehicle speed sensor that detects a vehicle speed, and that includes at least an accelerator opening amount command value based on the accelerator operation amount and a vehicle speed correction opening amount command value based on the vehicle speed In a throttle control device that electrically operates a throttle valve in accordance with a value, when the vehicle speed exceeds a set value, the vehicle speed correction amount opening command value for the throttle opening command value is set to the accelerator opening amount command value only. Control means for reflecting and operating the throttle valve is provided , and the control means increases the vehicle speed correction opening command value with time when the vehicle speed is equal to or higher than the first set value, and the vehicle speed is greater than the first set value. when even lower than the second set value that is set in a small value, the throttle control instrumentation, characterized in that to reduce the vehicle speed correction amount opening degree command value with time . The control means sets an idle control required opening degree command value so that idle speed control is performed by opening and closing the throttle valve, and minimizes the idle control required opening degree command value so that the vehicle speed does not exceed the set vehicle speed. The throttle control device according to claim 1, wherein the throttle valve is operated.

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