JPS62299436A - Control device for vehicle speed - Google Patents

Abstract

PURPOSE:To prevent a drop in the speed of a vehicle by providing an operation means for obtaining the opening of a throttle valve to enable running at a target speed, and actuating the valve to give an opening equivalent to the target speed at the start of constant speed running. CONSTITUTION:A constant speed running control means G opens and closes a throttle valve (c) toward a direction for a detected speed to coincide with a target speed, and a speed reduction instruction means (h) gives a command to a valve control means (g) for the close control of the throttle valve (c) during running at a constant speed set by the means G. In this case, the opening of the throttle valve (c) enabling a vehicle to run at a constant target speed can be obtained from an operation means (i) for valve opening corresponding to the constant speed running. And when the close control for the throttle valve (c) has finished for starting the constant speed running, a valve opening drive instruction means (j) gives a command to the valve control means (g) for opening the throttle valve (c) to an extent equivalent to the target speed. According to the afore-said constitution, a drop in the speed of the vehicle can be prevented at the time of a gear shift to constant speed control.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a vehicle speed control device that controls vehicle speed by opening and closing a throttle valve using a motor or the like. The present invention relates to a vehicle speed control device that can perform vehicle speed control that follows the vehicle speed and vehicle speed control that maintains the vehicle speed constant.

(Background of the Invention) This type of device has been proposed in Japanese Patent Application Laid-Open No. 59-122724, etc. When a vehicle runs at a constant speed, the throttle valve is opened and closed in the direction in which the actual vehicle speed matches the target vehicle speed. It is carried out by

In the conventional device, when the deceleration control performed by stopping the vehicle from traveling at a constant speed by operating the deceleration switch is completed, the throttle valve opening/closing control for the constant speed vehicle is immediately resumed.

For this reason, in the past, when constant speed driving was started, the vehicle speed dropped for a long period of time against the driver's will, as shown in Figure 2, which caused the problem that the driver felt uncomfortable. .

(Object of the Invention) The present invention has been made in view of the above-mentioned problems, and its purpose is to provide vehicle speed control that can effectively prevent a drop in vehicle speed when the vehicle starts running at a constant speed after the end of @speed control. The goal is to provide equipment.

(Configuration of the Invention) In order to achieve the above object, an apparatus according to the present invention is configured as shown in FIG.

In the figure, the operation amount of the accelerator operator a is detected by the accelerator operation amount detection means, and the opening and closing of the throttle valve C is controlled by the accelerator operation follow-up valve control means d in accordance with the detected operation amount.

Further, a target vehicle speed for constant-speed vehicle running is set by target vehicle speed setting means e, and the traveling speed of the vehicle is detected by vehicle speed detecting means f.

Further, the constant speed running valve control means q controls opening and closing of the throttle valve C in the direction in which the detected vehicle speed matches the target vehicle speed, and the closing control of the throttle valve C while the vehicle is running at a constant speed is controlled by the deceleration command means. A command is given to the constant speed running valve control means Ω.

Here, the opening degree of the throttle valve C that allows the vehicle to travel at a constant speed at the target vehicle speed is determined by the target vehicle speed equivalent opening calculation means i.

When the closing control of the throttle valve C is completed and the vehicle starts running at a constant speed, the throttle valve C is driven to open to the opening corresponding to the target vehicle speed by the valve opening drive command means j. A command is given to the control means 9.

(Description of Embodiments) Hereinafter, preferred embodiments of the apparatus according to the present invention will be described based on the drawings.

In FIG. 3, the lack of depression of the accelerator pedal 10 is detected by the accelerator potentiometer 12, and the detection signal is supplied to the throttle valve control circuit 14.

This throttle valve control circuit 14 is mainly composed of a microcomputer, and the detection signal of the accelerator potentiometer 12 is supplied to the CPU 18 via an input interface 16 in the throttle valve control circuit 14.

The CPU 18 obtains a motor control signal corresponding to the depression amount l of the accelerator pedal 10, and this motor control signal is output to the motor driver 22 via the output interface (latch) 20.

Then, the windings 24a and 24b of the step motor 24 are energized by the motor driver 22, so that the throttle valve 26 is controlled by the amount by which the accelerator pedal 10 is depressed. It is driven to open and close by a step motor 24 according to the timing.

Note that the throttle valve 26 is urged in the closing direction by a return spring 28.

Furthermore, the switching signal of the set switch 30 and the detection signal of the vehicle speed sensor 32 are also supplied to the CPtJ 18 via the input interface 16, and when the CPU 18 receives a command to start driving the vehicle at a constant speed by operating the set switch 30, the vehicle speed sensor The current vehicle speed V detected by 32 is set as the target vehicle speed VSE□ for constant speed driving.

Thereafter, the CPU 18 obtains a motor control signal for opening and closing the throttle valve 26 in the direction in which the detected vehicle speed V matches the target vehicle speed VSE, and as a result, the vehicle moves to the target vehicle speed V
It runs at a constant speed with SE□.

Note that the brake pedal depression, clutch pedal depression, and transmission shift operation to the neutral position are detected by the brake switch 34, clutch switch 36, and neutral switch 38, respectively.
The PU 18 monitors these switching signals applied via the input interface 16, and when it is confirmed that any one of these operations has been performed, the constant speed driving control of the vehicle is released.

Here, while the vehicle is running at a constant speed, deceleration control is commanded to the CPU 18 via the input interface 16 by operating the deceleration switch 40, and when the deceleration control is completed, the control for constant speed driving of the vehicle is executed by the CPU 18. It has been restarted.

Figure 4 shows C for vehicle speed control that follows accelerator operation.
The procedure of the process performed by the PU 18 is shown in a flowchart, and the process is repeatedly performed at a predetermined cycle.

In the same figure, in that process, the accelerator potentiometer 1
Along the depression of the accelerator pedal 10 detected by 2! is read (step 100), and the accelerator pedal depression amount! Target opening degree θ of the throttle valve 26 based on ! is determined (step 102).

Furthermore, when it is confirmed that the vehicle is not traveling at a constant speed (
(negative determination in step 104), the accelerator pedal depression amount! Target opening degree θ determined based on ! The deviation of the actual opening degree θ1 of the throttle valve 26 from the actual opening degree θ1 of the throttle valve 26 is determined (step 106), and a motor control signal corresponding to the deviation is outputted (step 108).

As described above, since the throttle valve 26 is controlled to open and close in accordance with the accelerator operation, the vehicle speed is also controlled to increase or decrease in accordance with the accelerator operation.

Note that in this embodiment, the actual opening degree θ of the throttle valve 26
1 is not directly detected, but is estimated from the feed amount of the step motor 24.

Further, FIG. 5 shows a flowchart of the procedure of processing performed by the CPU 18 to control the throttle valve for constant speed vehicle running, and the processing is repeatedly performed at a cycle different from the processing cycle of FIG. 4. ing.

In the process shown in FIG. 5, the current vehicle speed V detected by the vehicle speed sensor 32 is first read (step 110), and then it is determined whether the vehicle is traveling at a constant speed (step 112).

At that time, if it is determined that the vehicle is not running at a constant speed (if the determination is negative in step 112), it is determined whether or not the start of constant speed driving has been commanded by operating the set switch 30. (Step 114), and when the start of constant speed driving of the vehicle is not commanded, vehicle speed control that follows the accelerator operation is performed as described above.

Furthermore, when the start of constant speed driving of the vehicle is commanded (affirmative determination in step 114), the actual vehicle speed V read in the current processing cycle is stored as the target vehicle speed VSE for constant speed driving of the vehicle. (Step 116).

After that, while the vehicle is running at a constant speed, the target vehicle speed V3
The deviation of the current vehicle speed (2) with respect to E-engine and the amount of change thereof are determined (step 118), and a motor control signal corresponding thereto is output (step 120).

As a result, the throttle valve 26 changes the detected vehicle speed V to the target vehicle speed V.
Opening/closing control is performed in the direction consistent with SET, and the vehicle is driven at a constant speed at its target vehicle speed VSET.

Note that while the vehicle is running at a constant speed, any of the brake pedal depression, clutch pedal depression, or transmission shift operation to the neutral position is determined from the switching signals of the brake switch 34, clutch switch 36, and neutral switch 38. If it is confirmed (affirmative determination in step 122), the constant speed running control of the vehicle is canceled, and as a result, the above-mentioned vehicle speed control according to the accelerator operation is started again.

Furthermore, while the vehicle is running at a constant speed, the opening degree θ of the throttle valve 26 that allows the vehicle to run at the vehicle speed VSET is determined using the target vehicle speed V3ET from the characteristics prepared in advance (step 126>). Target vehicle speed equivalent opening θ
9 is compared with the target opening degree θl obtained in the process shown in FIG. 4 (step 128).

Then, the opening degree θ corresponding to the target vehicle speed is the target opening degree θ! exceeds and the driver intends to drive at a speed higher than the target vehicle speed VSET (
If the determination in step 128 is affirmative, the constant speed running of the vehicle is temporarily canceled (step 124), and the target opening degree θ!
Step 1 occurs when the opening degree corresponding to the target vehicle speed θ is less than or equal to the opening degree θ corresponding to the target vehicle speed.
28), constant speed vehicle running is resumed.

If the vehicle is commanded to decelerate by operating the deceleration switch 40 while the vehicle is running at a constant speed (affirmative determination in step 130), the motor control will fully close the throttle valve 26 after the deceleration flag is set. A signal is output (steps 132, 134).

As a result, vehicle deceleration control is performed as shown in FIG.

Thereafter, if the end of this deceleration control is commanded by operating the deceleration switch 40 (negative determination in step 130), the deceleration flag is reset after it is confirmed that it has been set (steps 136 and 138). , a motor control signal is output that causes the throttle valve 26 to have an opening degree θ corresponding to the target vehicle speed (step 140).

Since the deceleration flag is reset in the processing from the next cycle onward (negative determination at step 136), the vehicle is driven at a constant speed at the target vehicle speed VSE.

In this way, deceleration control is performed during constant speed driving control of the vehicle, and when the deceleration control ends and constant speed driving control is started afterwards, the target vehicle speed that allows the vehicle to travel at constant speed at the target vehicle speed V is set. Since the throttle valve 26 is once opened at the opening degree θ,
As can be understood from the vehicle speed characteristics shown in FIG. 6, no drop in vehicle speed occurs at this time, and therefore it is possible to shift control from deceleration control to constant speed driving control without any discomfort.

(Effects of the Invention) As explained above, according to the present invention, when deceleration control is performed during constant speed driving control, and when the deceleration control ends and constant speed driving control is restarted, the vehicle is driven at the target vehicle speed. Since the throttle valve is opened to an opening that allows the vehicle to travel at a constant speed, the vehicle speed does not drop during this control transition, and therefore the control transition from deceleration control to constant speed travel control is performed smoothly.

[Brief explanation of the drawing]

FIG. 1 is a diagram corresponding to claims, FIG. 2 is a characteristic diagram for explaining the operation of a conventional device, FIG. 3 is a block diagram showing a preferred embodiment of the device according to the present invention, and FIGS. FIG. 6 is a flowchart for explaining the operation of the embodiment, and FIG. 6 is a characteristic diagram for explaining the operation of the embodiment of FIG. 10... Accelerator pedal 12... Accelerator potentiometer 14... Throttle valve control circuit 22... Motor driver 24... Step motor 26... Throttle valve 30... Set switch 32... Vehicle speed sensor 34...Brake switch 36...Clutch switch 38...Neutral switch 40...Deceleration switch - Second figure 1

Claims (1)

[Claims] (1) An accelerator operation amount detection means for detecting the operation amount of the accelerator operation element, an accelerator operation follow-up valve control means for controlling opening and closing of the throttle valve according to the detected operation amount, and a target vehicle speed for constant speed driving of the vehicle. target vehicle speed setting means; vehicle speed detection means for detecting the running speed of the vehicle; constant speed running valve opening degree control means for controlling the opening and closing of the throttle valve in a direction in which the detected vehicle speed matches the target vehicle speed; deceleration command means for instructing the constant speed running valve control means to close the throttle valve, and target vehicle speed equivalent opening calculation means for calculating the opening degree of the throttle valve that allows the vehicle to travel at a constant speed at the target vehicle speed. A valve opening drive command that instructs the constant speed running valve control means to open the throttle valve to an opening corresponding to the target vehicle speed when the throttle valve closing control ends and the vehicle starts running at a constant speed. A vehicle speed control device comprising: means;