JPS6067232A - Constant speed running device - Google Patents

Abstract

PURPOSE:To avoid that a constant speed running is erroneously canceled during deceleration by operation of a setting switch, by providing a second predetermined vehicle speed for limiting deceleration by the operation of the setting switch in addition to a predetermined vehicle speed for canceling or inhibiting the constant speed vehicle running. CONSTITUTION:A pulse proportional to a vehicle speed from a vehicle speed detection switch SW1 is fed to a CPU, and a vehicle speed is stored by depressing a setting switch SW4 on an instrumental panel, simultaneously starting a constant speed running control. When the vehicle speed reaches a second predetermined vehicle speed for limiting deceleration during deceleration by operation of the setting switch, the CPU acts to automatically set a constant speed running by the second predetermined vehicle speed where deceleration is stopped. Thusly, since the deceleration of a vehicle does not reach the predetermined vehicle speed for canceling or inhibiting the constant speed running, it is possible to avoid that the constant speed running is erroneously canceled during deceleration by the operation of the setting switch.

Description

[Detailed Description of the Invention] [Object of the Invention] The present invention relates to a constant speed traveling device that stores the speed of a vehicle and automatically maintains the vehicle at the memorized speed. Concerning prohibited constant speed traveling devices.

(Prior art) As a constant speed traveling device, there is a device (Japanese Patent Application No. 58-034268) filed by the present applicant.This device detects the current vehicle speed as a number of pulses and calculates the number of pulses. An analog voltage proportional to is obtained as a vehicle speed signal.When the driver reaches the desired vehicle speed, he operates the constant speed running set switch to set (memorize) the vehicle speed signal at that point in the memory circuit.The speed control device The set vehicle speed signal is referred to as one reference voltage of the comparator circuit, and based on the difference between it and the current vehicle speed, the throttle opening is adjusted in a direction such that the difference becomes zero. If you continue to operate the set switch, the throttle opening is controlled to be smaller, the vehicle runs while decelerating, and the speed is memorized when you stop operating the set switch. It is equipped with Furthermore, when the vehicle speed becomes less than a predetermined vehicle speed (for example, less than 40 km/h), the stored vehicle speed is cleared and constant speed driving is canceled.

[Problems with the prior art and their technical analysis] In this constant speed running device, as mentioned above, when the set switch is operated during constant speed running control and this operation is continued, the vehicle decelerates, and the set switch is not operated. The speed at which the vehicle stopped is memorized and constant speed driving control is started. However, if the vehicle speed is lower than the predetermined vehicle speed when the set switch is stopped, the stored vehicle speed is cleared and constant speed driving is canceled. Therefore, at this time, it is not possible to return to constant speed running.

Therefore, the driver must accelerate with the accelerator and operate the set switch when the vehicle speed reaches a predetermined vehicle speed or higher, which is cumbersome to operate. Furthermore, since the driver does not know the predetermined vehicle speed accurately, such operations may have to be repeated when setting constant speed driving at a vehicle speed near the predetermined vehicle speed.

[Technical Problem] Therefore, a technical problem of the present invention is to prevent constant speed running from being canceled even when the set switch is operated to decelerate.

[Technical means]

The technical measures taken to solve the technical problem described in item 2 are that, in addition to the predetermined vehicle speed that cancels or prohibits constant speed driving, a second predetermined vehicle speed that limits deceleration by operating a set switch is provided; When the deceleration reaches a second predetermined vehicle speed, the deceleration is stopped and constant speed traveling at the second predetermined vehicle speed is automatically set.

[Effect of technical means]

The above technical means works as follows. When the vehicle speed reaches the second predetermined vehicle speed during deceleration by operating the set switch, deceleration is stopped and constant speed driving at the second predetermined speed is automatically set, so the deceleration of the vehicle is constant. Because the vehicle never reaches the predetermined vehicle speed that cancels or prohibits high-speed driving,
There is no possibility of accidentally canceling constant speed driving while decelerating by operating the switch.

〔Example〕

An example illustrating a specific example of the above technical means will be described below.

Figure 1 shows the electric circuit of the constant speed traveling device. This circuit is
This example is mainly configured with a single-chip microcomputer CPU, and input ports R1 to R5 of the microcomputer CPU include a slide switch SWI that detects a vehicle speed signal and a clutch switch S that detects depression of a clutch (not shown). 'W2, outputs of a brake switch SW3, a set switch SW4, and a resume switch SW5 that detect depression of a brake (not shown) are inputted via the interface IC1.

A permanent magnet PM connected to a speed make cable (not shown) is arranged near the reed switch SWI, and when the permanent magnet PM rotates due to the movement of the vehicle,
The contacts of the reed switch SWI open and close, and a pulse (vehicle speed signal) with a frequency proportional to the vehicle speed is sent to the CPU.

Clutch switch SW2 opens and closes in conjunction with the vehicle's clutch pedal, and stop switch SW3 opens and closes in conjunction with the vehicle's brake pedal. Stop switch SW3
A stop lamp L is connected to the stop lamp L, and the stop lamp L lights up when SW3 is turned on (closed).

Sera l-switch SW4 and resume switch SW
5 is a push button switch, which is arranged on the instrument panel. When the set switch SW4 is pressed, the vehicle speed is memorized and constant speed control is started, while when the clutch switch SW2 or brake switch SW3 is pressed, the constant speed driving is stopped, but the stored vehicle speed remains. When the resume switch SW5 is pressed, constant speed driving control is started at the memorized vehicle speed before constant speed driving is canceled.

Drive circuits DVI and D2 are connected to output ports 01 and 02 of the microcomputer CPU, respectively, and a negative pressure actuator 1, which will be described later, is connected to the output of the drive circuit DVI.
A control solenoid SLI for controlling 40 is connected, and a release solenoid SL2 is connected to the output of the drive circuit DV2.

When the brake switch SW3 is turned on, the self-holding circuit IC2 holds a 1 level signal at the output, deenergizes the release solenoid FSL2 independently of the CPU operation, and sets the set switch SW4 when the resume switch SW5 is turned on. Hold the L level signal at the output and energize the release solenoid.

FIG. 2 shows the configuration of the negative pressure actuator 100 controlled by the electric circuit shown in FIG. 1. This will be explained with reference to FIG. The housing 101 consists of two parts 101a and 101b. Diaphragm 102 has two parts 101
It is held between the flanges a and 101b. A space surrounded by the diaphragm 102 and the housing 101a is a negative pressure chamber, and a space surrounded by the diaphragm 102 and the housing 101b is a negative pressure chamber.
The space surrounded by is in communication with the atmosphere. A compression coil spring 103 is inserted between the housing 101a and the diaphragm 102, and pushes the diaphragm 102 back to the position of the imaginary line when the negative pressure is close to atmospheric pressure. A protrusion 104 fixed near the center of the diaphragm 102 is connected to a link of a throttle valve 105.

The intake manifold 1 is attached to the hanging 101'a.
An intake port 107 communicating with 06, and air intake ports 10B and 1098 are provided.

110 is a negative pressure control valve, and 111 is a negative pressure release valve, both of which are fixed to the housing 101a. A movable side 112 of the negative pressure control valve 110 is extendable about P as a fulcrum, and a tension coil spring 113 is connected to the other end, and the other end faces the control solenoid SLI. Both ends of the movable side 112 function as valve bodies, and they open the negative pressure intake port 107, close the atmospheric air intake port 108 (state shown), or close the negative pressure intake port 10'7 in response to the energization and deactivation of the solenoid 5LIO. , air intake will be open for 110 days.

Similarly to the negative pressure release valve 110, the negative pressure release valve 111 also includes a movable piece 114, a tension coil spring 115, and a solenoid S L, 2.
However, the movable piece 114 prevents the atmospheric intake port 109 from being blocked (
condition shown) or open.

Note that 116 is an accelerator pedal, and 117 is a tension coil spring.

During constant speed driving control, the stored vehicle speed and the current vehicle speed are compared in the CPU, and the control solenoid control duty is determined so that the difference is equal. For example, when deceleration is required, the duty ratio becomes low, and the negative pressure control valve 11
0 has a large proportion of the time during which the inside of the negative pressure actuator 100 is communicated with the atmosphere, and the negative pressure actuator 100 closes the throat valves 1 to 1. Conversely, when acceleration is required, the duty ratio is increased and the throttle valve is opened by the actuator 100.

Next, the program executed in the CDPU (Figures 3 to 7)
Figure ) will be explained.

See Figure 3. First, when the power is turned on and voltage is applied to the CPU, initial settings are performed.

That is, the output port is set to the initial level and the contents of the memory are cleared (Sl). Next, in step S2, it is determined whether the current vehicle speed is less than or equal to constant speed limit 1 (for example, 49 km/11). If No, it is determined in step S6 whether the brake switch SW3 is on (closed), and whether the clutch switch SW2 is on or not is determined in S7. If any switch is turned on, the state S is set to 0 in step S8; if none of the switches is turned on, it is determined in step S9 that the set switch SW4 is on; if YES, that is, the state is turned on. If so, step 3
10, the shape 6s is set to 2. If the resume switch SW5 is turned on in step Sll, step 3
At step 12, the state S is set to 3.

Returning to step S2, the current vehicle speed is the constant speed limit vehicle speed l.
(For example, 40km/lt) or less, step S
3, the memory is cleared and the °C state S is set to 0 in step S8. This is a constant speed limit function, and when the current vehicle speed is less than the constant speed limit vehicle speed 1, the CPU enters a standby state (S=0), and the solenoid control of the actuator is not performed by the CPU, and constant speed traveling control is prohibited.

In step S13, the standby state subroutine 314 (FIG. ffi4) with S=0 branches to four subroutines 314 to S17 according to the value of the state S from 0 to 3. At 325 and 326, the control solenoid SLI and the release solenoid SL2 are activated, respectively. It is turned off and throttle control is canceled.

Control state subroutine S1'5 (ffi5[
ff1), first, at 327, release solenoid, S
L2 is turned on, and at 328, the control solenoid S Ll is controlled in the direction of zeroing the difference between the current vehicle speed and the stored vehicle speed, and the control solenoid is turned on and off at a predetermined duty timing to maintain the vehicle at a constant speed. do.

In the set state routine 316 (FIG. 5) with S=2, the release solenoid is turned on in S50, and it is determined in S51 whether or not the set switch sw4 is turned on. When the answer is No, that is, when the set switch that was once turned on is released and turned off, the current vehicle speed is stored in the memory vehicle speed memory in the CPU at Stella 7''S52, and the state!3S is displayed at 353.
is taken to be 1.

This subsequently enables constant speed control in the control state loop. If YES in step-351, that is, the set switch continues to be pressed, step A54
Proceed to the current vehicle speed or constant speed limit I (for example, 40km/
h) If the following occurs, proceed to step 355 and turn off the control solenoid SLI. Next, step 35
6, the current vehicle speed changes to constant speed limit vehicle speed 2 (for example, 45
kn+/b) or less. If the current vehicle speed is greater than the constant speed limit vehicle speed 2, the process advances to step 355 and the control solenoid SLI is turned off. Therefore, the vehicle speed gradually decreases. At this time, if the set switch SW2 is turned off before the current vehicle speed reaches the constant speed limit vehicle speed 2, this is determined in step 351, and step S52. Proceeding to step S53, the vehicle returns to constant speed running again. Next←, when deceleration continues until the current vehicle speed reaches constant speed limit vehicle speed 2, this is determined in step 354 and the process proceeds to step S57. In step 357, the constant speed limit and vehicle speed 2 are stored as a stored vehicle speed, and in step 35B, the control solenoid sL2 is controlled on/off with a predetermined duty so that the difference between the current vehicle speed and this stored vehicle speed becomes 0. Controls the vehicle to run at a constant speed.

In the resume state routine 517 (FIG. 7) with S=3, after the release solenoid S L 2 is turned on in S35, it is determined in S36 whether the resume switch SW5 is on (closed). If No, that is, if the resume switch that was once turned on is released and turned off, the state [3 is set to 1 in step S37, and the control state routine can then be entered. YE at 336
When S, that is, when the resume switch SW5 is still being pressed, it is determined in 338 whether 0.5 seconds or more has elapsed since the resume switch was turned on (closed). If YES, that is, if the resume switch SW5 is kept pressed for 0.5 seconds or more, the control knob is turned on and acceleration control is performed, and the current vehicle speed is newly stored in 340. When the answer in step 338 is NO, that is, if the switch is pressed 81N within, for example, 0.5 seconds after the resume switch SW5 is pressed, the process in step S41
At step 342, the previously stored vehicle speed is set as the target vehicle speed, and at step 342, the control solenoid is controlled on and off according to a predetermined duty to maintain the vehicle at the target vehicle speed.

The above programs are executed within the CPU, and various modes are achieved in response to operations of the brake switch, clutch switch, set switch, and resume switch.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of the electric circuit of the constant speed traveling device of the present invention, FIG. 2 is a longitudinal sectional view showing a negative pressure actuator controlled by the circuit of FIG. 1, and FIG. ~Figure 7 is a flowchart showing an example of a program executed in the CPU 100... Negative pressure actuator (
actuator means), SWl... reed switch (
vehicle speed detection means), SW2...clutch switch, SW
3... Brake switch, SW 4... Set switch (switch means), SW5... Resume switch, SLl... Control solenoid, SL2...
...Release solenoid, cpU...microcomputer (electronic control means), IC1...interface circuit, IC2...self-holding circuit, DVI, DV2
...Drive circuit patent applicant 1 Isin-Ken Narakura-style meeting? ! Representative Reio Nakai fls 6 U<l 5=2 Figure 7

Claims (1)

[Claims] A vehicle speed detection means, a switch means, a means for storing a predetermined vehicle speed by the operation of the switch means, an actuator means for controlling opening/closing of a throttle, and comparing the stored vehicle speed with the current vehicle speed to eliminate the vehicle speed difference. electronic control means for controlling the actuator means in a direction, and prohibits the control when the vehicle speed is below a predetermined speed, and when the switch means is in a predetermined state, it controls the actuator means in a direction to reduce the opening degree of the throttle. In the energizing constant speed traveling device, a second predetermined vehicle speed is set separately from the predetermined vehicle speed, and when the predetermined state of the switch means continues and the vehicle speed reaches the second predetermined vehicle speed, the second predetermined vehicle speed is set. A constant speed traveling device that controls vehicle speed at a predetermined speed.