JP2512296B2 - Memory speed change method of constant speed running control device - Google Patents

Description

The present invention relates to a storage vehicle speed changing method for a constant speed traveling control device, and particularly eliminates a discontinuous region between a slight increase (decrease) speed and a continuous increase (decrease) speed. That is what it does.

[Conventional technology]

A constant speed running control (auto drive) device for automatically controlling the running vehicle speed with the stored vehicle speed as a target after taking the running vehicle speed from the vehicle speed sensor and storing the value at a certain time in the memory is shown in FIG. 3, for example. In addition, it is composed of an auto drive computer 1 and an actuator 2 for adjusting the throttle opening. Autodrive computer 1
An input / output circuit 11 for taking in signals from a vehicle speed sensor, a set SW (switch), a resume SW, a cancel SW, etc., a microcomputer 12 for controlling a constant speed traveling using these signals, and a circuit for driving the actuator 2. 13 and 13. The actuator 2 uses, for example, a negative pressure of the intake manifold as a power source, and the introduction amount of the actuator is controlled by the control valve 21.
Adjust with. 22 is a release valve that introduces the atmosphere, which is used when releasing.

When the stored vehicle speed is changed during constant speed traveling, the traveling vehicle speed thereafter changes accordingly. This method has the following four modes.

Accelerator (Continuous acceleration) If the switch is held down during constant speed control, the speed increases and constant speed control is performed at the vehicle speed when the switch is released.

Tap up (slight acceleration) If the switch is pressed briefly during constant speed control, the speed is increased by 1-2 Km / h to perform constant speed control.

Coast (Continuous deceleration) If the switch is held down during constant speed control, the speed is reduced and constant speed control is performed at the vehicle speed when the switch is released.

Tap down (fine deceleration) Pressing the switch for a short time during constant speed control will decelerate by 1-2 km / h to perform constant speed control.

In general, the same switch is used for both the above and the same switch. In addition to these 4 modes, a set that stores the traveling vehicle speed from the non-controlled state and shifts to the constant speed traveling and a resume mode that returns to the constant speed traveling with the stored vehicle speed before cancellation are added, and a total of 6 modes can be set with two switches. When operated, the instruction function of each switch is as follows.

Switch 1: Set / Coast / Tap down Switch 2: Resume / Axel / Tap up [Problems to be solved by the invention] Conventionally, the coast (accelerator) and tap down (tap up) switch 1 (2) ON time Are distinguished by. For example, as shown in FIG. 4, if the ON time of the switch 2 is less than a certain time T ₁ (usually set to 0.5 to ₁ sec), it is determined to be tap-up, and if it is longer than that, accelerator is determined. The tap-up is 1 to 2 Km / h depending on the previous memory vehicle speed.
In addition, since the memory is updated, the storage vehicle speed changes instantaneously as shown in FIG. On the other hand, the accelerator is a mode in which the actual traveling vehicle speed is stored again. In these acceleration modes, the duty is set to maximum or high to increase the traveling vehicle speed (the deceleration mode is the opposite), but the tap-up effective time T ₁ is of course due to the time constant of the mechanical system such as the actuator. , After that, for a while, there is a time T ₂ during which the traveling vehicle speed does not exceed the memory vehicle speed for tap-up. Therefore switch 2 to T ₁
The memory vehicle speed increases with the tap-up function when pressed within a short time, but if the button is continuously pressed beyond T ₁ , a discontinuous area occurs in which the memory vehicle speed does not increase within the next T ₂ than tap-up. The same applies to the deceleration control side of the switch 1.

The present invention slightly increases (decreases) the initial change width of continuous increase (decrease) speed.
The discontinuity region T ₂ described above is attempted to be eliminated by making the speed change width equal.

[Means for solving problems]

The present invention automatically controls a traveling vehicle speed with a storage vehicle speed stored in a memory as a target value, and performs acceleration or deceleration control while a storage vehicle speed change instruction switch is operated during the automatic control, and operates the switch. In the storage vehicle speed changing method of the constant speed traveling control device having the acceleration / deceleration means for updating the storage vehicle speed stored in the memory with the traveling vehicle speed at the time of ending as the new storage vehicle speed, the switch is operated during the automatic control. Then, the stored vehicle speed is updated to a constant value and acceleration or deceleration control is performed, and the switch is continuously operated, and after the traveling vehicle speed reaches the stored vehicle speed after the constant value is updated, the acceleration / deceleration means is set. It is characterized in that the memory vehicle speed can be updated by.

[Action]

FIG. 1 is a diagram for explaining the principle of the present invention, and exemplifies speed-up control. In the present invention, the accelerator (coast) and the tap-up (tap-down) are not distinguished by the ON time of the switch, but when the switch is ON, the tap-up process is first started, and then the acceleration range of the tap-up is exceeded. If the switch continues to be turned on until the vehicle speed increases, it is judged as an accelerator. In this way, the discontinuous region of the memory vehicle speed that shifts from tap-up to accelerator is eliminated.

T _{3 in} FIG. 1 is the tap-up effective time, which is not a fixed value that is time-controlled, but a result obtained by comparing the stored vehicle speed and the traveling vehicle speed, and is a variable value. That is,
When T ₁ and T ₂ in Fig. 4 are used to manage time so that T ₃ = T ₁ + T ₂ , T ₃ > T ₁ + T ₂ or T ₃ <T ₁ + T ₂ depending on the road surface condition. This is because there is still a possibility that discontinuity will occur. In this respect, as in the present invention, if the initial value of the accelerator is set to the acceleration range of tap-up and then the accelerator processing is performed when the switch continues to be turned on until the stored vehicle speed and the traveling vehicle speed match, the stored vehicle speed is surely achieved. The discontinuity area of disappears.
The same applies to deceleration control.

〔Example〕

FIG. 2 is a flowchart showing one embodiment of the present invention.
The speed-up range for tap-up is 1.5Km / h. SW2
Switch 2, V is the traveling speed, V _M is stored vehicle speed, F is shows a tap up flag. The memory vehicle speed V _M is used during the constant speed control of SW2 off (OFF), but the memory vehicle speed V _M is not used during the speed increase control of SW2 on (ON).

When SW2 is switched from OFF to ON, the memory vehicle speed is first increased by 1.5 km / h (V _M ← V _M +1.5), and then the tap-up flag E is set. This means that you have entered T ₃ in Figure 1. Then monitors the traveling speed V ON of SW2, moves to the accelerator treatment to reset the flag F If a V> V _M during SW2 ON period (V _M ← V). This means that you have passed T ₃ in Fig. ₃ . After that, it is sufficient to detect the turning off of SW2 and shift to the constant speed control. If SW2 is turned off before V> V _M , tap-up processing (V _M ← V _M +1.5) may be performed and control may be shifted to constant speed control.

〔The invention's effect〕

As described above, according to the present invention, when the switch is operated during the constant speed traveling control, the stored vehicle speed is updated by a constant value,
When the acceleration / deceleration processing is performed accordingly, after the traveling vehicle speed reaches the stored vehicle speed updated by the constant value, the traveling vehicle speed at the time when the operation of the switch is finished is changed to the processing for updating the traveling vehicle speed as the stored vehicle speed. .

Therefore, the stored vehicle speed at the time of the change, that is, the stored vehicle speed updated by the constant value, matches the traveling vehicle speed, and thereafter, the traveling vehicle speed is stored as the stored vehicle speed at the time when the operation of the switch is completed. There is an advantage that the storage vehicle speed update processing can be changed so that the storage vehicle speed does not change suddenly and the storage vehicle speed does not become discontinuous.

[Brief description of drawings]

FIG. 1 is an explanatory view of the principle of the present invention, FIG. 2 is a flow chart showing an embodiment of the present invention, FIG. 3 is a schematic view of a constant speed traveling control device, and FIG. 4 is an explanatory view of conventional speedup control. Is. In the figure, SW2 is stored vehicle speed change instruction switch, V is the traveling speed, V _M is the stored vehicle speed.

Claims (1)

(57) [Claims] 1. A vehicle speed automatically controlled by using a memory vehicle speed stored in a memory as a target value, and speed increase or deceleration control is performed while a memory vehicle speed change instruction switch is operated during the automatic control. In the storage vehicle speed changing method of the constant speed traveling control device having the acceleration / deceleration means for updating the storage vehicle speed stored in the memory as the new storage vehicle speed at the time of completion of the operation, the switch during the automatic control is When operated, the stored vehicle speed is updated to a constant value and acceleration or deceleration control is performed, and the switch is continuously operated, and the acceleration / deceleration is performed after the traveling vehicle speed reaches the stored vehicle speed after the update of the fixed value. A method for changing a storage vehicle speed of a constant speed traveling control device, characterized in that the storage vehicle speed can be updated by means.