JP2516028B2 - Throttle valve control device - Google Patents

Description

The present invention relates to a throttle valve control device, and more particularly to a throttle valve control device driven by a motor in response to an operation of an accelerator pedal.

(Prior Art) In automobile throttle control, an electric actuator is driven according to the amount of depression of an accelerator pedal to control the opening / closing of a throttle valve.

FIG. 6 is a diagram showing a throttle control system, with which a conventional control device will be described.

First, the accelerator sensor 1 detects the depression amount of an accelerator pedal (not shown) and converts it into, for example, an electric amount (θ
_ACC ) and input to the master controller 2.

The master controller 2 outputs the throttle required opening degree θ ′ _TH corresponding to the input electric quantity, and the comparator 3 derives the difference from the actual throttle opening degree θ _TH from the throttle sensor 6 to obtain the motor controller. The motor 5 is driven via 4.

That is, feedback control is performed so that the difference between the required throttle opening and the actual throttle opening becomes zero.

(Problems to be Solved by the Invention) The control state of the above-described conventional apparatus will be described with reference to FIG.

When the throttle target opening is set as shown by the solid line with respect to time, the actual throttle opening is in the state shown by the dotted line.

That is, when the throttle target opening is set, the operation is delayed in time and overshoot development occurs.

In this case, in the case of the control to the medium opening degree such as when the opening degree control is A → C and C → B, even if there is an overshoot phenomenon with respect to the target value, there is no particular adverse effect. Does not happen.

However, if there is an overshoot phenomenon in the case of control to an idle opening degree such as B → D, the throttle lever impacts the full-closed stopper, and as a result, the reduction gear system of the motor main body or gears or It may damage the throttle lever.

The reason why the fully closed stopper is provided is that the throttle valve (butterfly valve) directly contacts the throttle body to prevent galling of the valve.

Therefore, by providing this, there is no malfunction due to galling of the valve, but on the other hand, impact force is applied to the reduction gear system such as the motor main body or gears, which may cause malfunction of the throttle system. there were.

Further, if an impact force is repeatedly applied to the fully closed stopper, the throttle lever or the like may be deformed and the meaning of the fully closed stopper may be lost.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a throttle valve control device capable of improving the reliability of a throttle actuator.

[Structure of the Invention] (Means for Solving Problems) According to the present invention, an accelerator sensor and a throttle are provided in a throttle valve control device that drives a throttle actuator to control a throttle opening to match a throttle target opening. A first means for inputting each detection output from the sensor to determine whether or not the throttle opening required is an idle opening, and a throttle valve immediately before the idle opening when the determination result is the idle opening. A second means for generating a control signal for adding a damping process to the operation of moving to the throttle target opening from the opening position to the idle opening position.

The damping process is, strictly speaking, when the throttle opening approaches the idle opening, the idle opening +
This means that the control process is performed such that the speed change rate of the throttle target opening is gradually reduced between the throttle opening (1 ° to 8 °) and the idle opening. As a result, it is possible to avoid the lever from colliding with the fully closed stopper due to overshoot when the throttle opening approaches the idle opening, and to reduce the impact of the lever collision with the fully open stopper when approaching full opening.

(Operation) When the first means determines that the required throttle opening is the idle opening, the control signal for adding the damping process is generated as the output by the second means. That is, between the throttle opening immediately before the idle opening and the idle opening, a control process is performed to gradually reduce the speed change rate of the throttle opening, so the connection to the idle opening becomes smooth, It converges without overshooting.

(Examples) Examples will be described below with reference to the drawings.

FIG. 1 is a functional block configuration diagram of an embodiment of a throttle valve control device according to the present invention.

In FIG. 1, reference numeral 10 denotes a calculation unit of the throttle valve control device, which includes a throttle required opening degree determination means 11 and a virtual required opening degree signal generation means 12.

Here, the throttle required opening degree determination means 11 inputs each detection output from an accelerator sensor and a throttle sensor (not shown), and the throttle required opening degree as a result of these is
It is determined whether the idle position has been set.

If the throttle required opening degree is set to the idle position, the virtual required opening degree signal generating means 12 generates a virtual required opening degree signal in a predetermined mode described later.

FIG. 3 is a concretely illustrated embodiment, in which the actuator 13 is operated based on the output from the accelerator sensor 1 and the output from the throttle sensor 6, and the throttle valve 14
It has a structure for rotating the throttle shaft 15 integrally with the above.

Further, in the present invention, as shown in FIG. 2, the throttle opening is made to converge to the idle position.

FIG. 4 is a diagram showing how to make the required throttle opening degree converge. In FIG. 4, the vertical axis represents the throttle opening and the horizontal axis represents time. Θ _{ID on the} vertical axis represents the idle opening position, and θ _ID + 3 ° represents the position obtained by adding 3 ° to the idle opening.

In Fig. 4 (a), the actual required throttle opening is θ _ID +
What is changed from the 3 ° position to the idle opening θ _ID as shown by the dotted line (A) is shown as a curved line B (this is called a curved line) so as to have a dumbing effect as a virtual required opening. There is. Therefore, the time T for convergence is
It takes about 10 to 500 ms.

The curved shape is such that the rate of change of the throttle opening gradually decreases as the throttle opening approaches the final target opening. Therefore, on a coordinate where the horizontal axis represents time and the vertical axis represents the throttle opening, a curved line is projected toward the origin of the coordinate as shown in FIG. As a result, the connection to the idle opening is slippery and overshoot is eliminated.

FIG. 4 (b) is a straight line B-1 (this is called a slanted line).
4 (c) shows a step B-2 (this is referred to as a step shape).
The term "inclined linear" means that the rate of change of the throttle opening is changed to be small, but it is constant until the throttle opening reaches the final target opening. Therefore, the straight line has a gentle slope as shown in FIG. As a result, the impact force can be weakened when the idle opening is converged.

In addition, the stepped shape means that the change of the throttle opening is stopped and after a certain period of time, it is slightly changed and stopped, and after a certain period of time, it is slightly changed and stopped. By repeating this, the final target opening is reached. Therefore, there is a step-like change as shown in FIG. 2 in this example
This is an example of repeated changes. As a result, it is possible to weaken the driving force per one time when converging to the idle opening degree, and it is possible to weaken the final impact force. In any case, after the damping process, the closing speed of the throttle becomes slower than before the damping process, so that the overshoot or the impact of the lever on the stopper is alleviated.

In short, the required throttle opening as a result of calculation is
The opening set in advance as described above (for example, θ _ID + 3 °)
When passing through the position at a speed equal to or higher than a preset speed, the position is slowly converged according to the above-described predetermined virtual required opening degree pattern regardless of the actual movement of the required opening degree.

FIG. 5 is a flow chart showing the processing contents of the calculation unit. First, at step 51, the throttle required opening “idle position + (value within a range of 1 ° to 8 ° at a preset opening)” is passed. Then, it is determined whether or not the opening changes to the idle equivalent opening degree.

Regarding the effect produced by limiting the starting point to “idle opening +1 to 8 degrees”, if damping processing is performed from a high opening of the throttle, the engine brake will not be applied easily during deceleration, and the deceleration feeling intended by the driver will be obtained. It will be in a state where it is cut off. The limit is "idle opening +8 degrees". Further, the damping process from a low throttle opening is too short to process effectively. The limit depends on the capabilities of the sensor, actuator, and CPU, but currently it is "idle opening + 1 degree".

Further, the reason why the throttle valve does not directly collide with the throttle body is that when the throttle opening approaches the target opening, which is the idle opening, it converges while gradually decreasing the rate of change of the throttle opening at the throttle target opening position. This is because the overshoot can be eliminated.

If NO, it means that the control is for an intermediate opening that does not reach the idle opening position, so the processing in the damping mode ends.

In the case of Yes, the process proceeds to step 52, and the virtual required opening degree signal is generated in a preset pattern.

That is, one of the opening degree signal patterns shown in FIG. 4 is generated. In step 53, it is determined whether or not the required throttle opening has changed to the idle-equivalent opening, and the process returns to step 52 until it reaches the idle-equivalent opening, the control is repeated, and the damping mode processing ends.

Therefore, as indicated by J'in FIG. 2, the movement of the throttle valve is slowly controlled to the idle position by the damping effect, and the throttle valve fully closed stopper is never shocked.

In the above embodiment, the case where the throttle valve opening decreases from a large opening and hits the full-closed stopper has been described, but the invention is not limited to this. Conversely, the throttle valve opening increases from a small opening. It is obvious that the present invention can also be applied to the case of hitting the fully open stopper.

[Effects of the Invention] As described above, according to the present invention, the throttle valve can be rotated at a predetermined front position up to each physical stopper provided for restricting the fully closed or fully opened position of the throttle valve. Since the damping function is added, the throttle lever is not impacted against each stopper and, as a result, the reliability of the throttle actuator can be greatly improved.

[Brief description of drawings]

FIG. 1 is a functional block configuration diagram of an embodiment of a throttle valve control device according to the present invention, FIG. 2 is a control state diagram of a throttle valve according to the present invention, FIG. 3 is a specific configuration diagram of the embodiment, and FIG. FIG. 7 is a diagram showing how to converge the required throttle opening, FIG. 5 is a flow chart showing the processing contents of the calculation unit, FIG. 6 is a diagram showing a general throttle control system, and FIG.
The figure is a control state diagram of a conventional throttle valve. 10 ... Calculation unit of throttle valve control device 11 ... Throttle required opening degree determination means 12 ... Virtual required opening signal generation means

Claims (5)

(57) [Claims] 1. A throttle target opening signal is output by inputting a signal generated according to the accelerator depression amount and a signal generated according to the throttle valve opening amount, and a throttle actuator is driven to drive the throttle opening. In the throttle valve control device for controlling the throttle opening to match the throttle target opening, the detection outputs from the accelerator sensor and the throttle sensor are input to determine whether the throttle required opening is the idle opening. 1) and when the determination result is an idle opening, damping processing is added to the movement operation to the throttle target opening between the throttle opening position immediately before the idle opening and the idle opening position. And a second means for generating a control signal for controlling the throttle valve. 2. The throttle valve control device according to claim 1, wherein the damping process is added as a curved line. 3. The throttle valve control device according to claim 1, wherein the damping process is added as an inclined line shape. 4. The throttle valve control device according to claim 1, wherein the damping process is added stepwise. 5. The throttle opening position as a starting point is set within a range obtained by adding 1 ° to 8 ° to the idle opening, and the throttle opening position is set to 1 or 2 or 3. Alternatively, the throttle valve control device according to item 4.