JPH04108041A - Constant speed running device for vehicle - Google Patents

Abstract

PURPOSE:To improve use convenience of constant speed running by not eliminating a preset constant running speed for a fixed time from increase of a speed to a predetermined value or more, after a vehicle is stopped, but enabling a resuming function to restart when a resuming operation is provided during this time. CONSTITUTION:In a CPU2 in a constant speed running device for a vehicle, a detection signal of a car speed sensor 10 is input through a car speed input circuit 11, speed setting for constant speed running is performed by a set/coast switch 12, starting of a resuming function is performed by a resume/accelerator switch 13, and in accordance with a result of these switch operations, a signal for realizing constant speed running is input from a resume input circuit 14 to the CPU2. Here, in the CPU2, when a speed exceeds again the predetermined car speed after the vehicle is stopped, counting of predetermined time is started, to actuate the resuming function, when a resuming operation is provided during this time, and to eliminate a preset speed for the constant speed running simultaneously with the lapse of predetermined time unless the resuming operation is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a constant speed traveling device for a vehicle, and particularly to a resume (resume) device.
The present invention relates to a constant speed traveling device for a vehicle having a resume function.

(Prior art) Conventionally, a constant speed driving device for a vehicle stores a set speed for constant speed driving (auto cruise) in memory, and while driving at the set speed, brake operation etc. causes the vehicle speed to drop below a certain speed. If the speed drops to below, the resume function is canceled and the set speed is erased from memory.

FIG. 3 is a flowchart showing a control procedure in the conventional vehicle constant speed traveling system described above. In the same figure, it is determined in step S21 whether the speed has been set for constant speed running, and if the speed has not been set, the process ends. However, once the speed is set, it is stored in a memory (not shown). Then, in step S22, a throttle actuator (not shown) is controlled based on the set value to realize constant speed running.

In step S23, the current vehicle speed or a predetermined speed, for example 40 km, is determined based on a signal from a vehicle speed sensor (not shown).
/ Determine whether it is less than or equal to h. If the result of the determination is No, the process returns to step S22 and constant speed driving control is continued.

However, as a result of the determination, if the vehicle speed has decreased to 40 km/h or less, the process proceeds to step s24, and the resume function is canceled so that it does not operate. And the continuation (
In step S25, the set speed in the memory is erased and the process ends.

(Problem to be Solved by the Invention) However, in the above conventional example, when the vehicle speed decreases below a predetermined speed, the set speed stored in the memory is erased. There is a problem in that when the vehicle speed is once lowered and then the vehicle speed is restored to a predetermined speed or higher, a situation arises in which, even though the vehicle intends to resume constant speed driving, it is not possible to do so. Therefore, if the driver wishes to drive the vehicle at a constant speed again, it is necessary to re-set the speed, which has the disadvantage that constant speed driving is inconvenient.

(Means for Solving the Problems) The present invention has been made for the purpose of solving the above-mentioned problems, and includes the following configuration as one means for solving the above-mentioned problems.

That is, it is a constant speed traveling device for a vehicle having a resume function, and includes a storage means for storing a set constant traveling speed;
A vehicle speed detection means detects whether the vehicle speed changes from approximately zero to a predetermined speed or higher after driving at a constant speed; a resume detection means for detecting the presence or absence of an operation requesting operation of the resume function; and when the resume detection means cannot detect the operation requesting operation of the resume function within a predetermined time, erasing the constant traveling speed stored in the storage means; and means to do so.

(Function) In the above configuration, after the vehicle stops, the set constant running speed is not erased for a certain period of time after the vehicle speed reaches a predetermined value, and if there is a resume operation during that time, the resume function is restarted. work.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram showing the configuration of a constant speed traveling device for a vehicle (hereinafter referred to as the device), which is an embodiment of the present invention. In the figure, a constant speed running control unit (hereinafter referred to as unit) 1 has a CPTJ 2 that contains a control program and controls the entire unit, and a CPU 2 realizes constant speed running according to an input signal to be described later. If the CPU 2 goes out of control, the watchdog 9 resets the CPLI 2.

When the main on switch 6 is turned on, current flows from the IG 7 to the solenoid 4a of the circuit breaker 4, and the circuit breaker 4b is turned on.
is on, so IG7, main off switch 5
, the circuit breaker 4 , and the constant voltage circuit 3 , power for operation is supplied to the CPLI 2 .

The CPU 2 learns the vehicle speed by inputting the signal detected by the vehicle speed sensor 1o via the vehicle speed input circuit 11. Also,
The speed setting for constant speed driving is set/coast (SE
T/C0AST) Switch 12 +,: TE is performed and also starts the resume function with the RESUME/ACCEL switch 13
Operate and do it. The results of these switch operations are input to the resume input circuit 14, and from the resume input circuit 14, a signal for realizing constant speed running is input to the CPU 2.

The CPU 2 controls the actuator output circuit 3 based on signals from the vehicle speed human power circuit II and the resume input circuit 14.
1, a signal for adjusting the throttle is sent so that the vehicle runs at a desired speed. Actuator output circuit 31 receives the signal and controls throttle actuator 33. In addition, the actuator output circuit 31
The output signal of the output circuit is constantly monitored by the output circuit monitor 32, and the result is fed back to the CPU 2. This output circuit monitor 32 is the actuator output circuit 3
When an abnormality is found in the output signal from 1, the power cutoff circuit 34 is notified of the abnormality, and in response, the power cutoff circuit 3
4 stops the current to the solenoid 4a of the circuit breaker 4. As a result, the cutoff switch 4b is turned off and the constant voltage circuit 3
The voltage supply to the CPU 2 is cut off, and the operation of the CPU 2 stops. Therefore, since the signal output from the actuator output circuit 31 also stops when the operation of the CPU 2 stops, the throttle control is stopped.

The power cutoff circuit 34 receives the output from the resume input circuit 14, the stop lamp switch input circuit 19, and the brake switch input circuit 2 which are input through the gate 35.
1, and also when receiving an output from the clutch switch input circuit 22, INH realizes a power cutoff operation.

Next, we will discuss the control procedure in the device of this example in the second section.
This will be explained with reference to the flowchart shown in the figure.

In step S1 of FIG. 2, the CPU 2 determines whether or not the speed has been set for constant-speed running using the set/coast (SET/CAST) switch 12. If the speed has not been set, the process immediately ends; Once the settings are made, they are stored in the memory 2a. Then, in step S2, the throttle actuator is controlled based on the set value to realize constant speed running.

In step S3, the CPU 2 selects the current vehicle speed or a predetermined speed, for example 40 k, based on the signal from the vehicle speed input circuit 11.
The result of 1 judgment to determine whether it is less than m / h is NO
If so, the process returns to step S2 to continue constant speed driving control. However, as a result of the determination, if the vehicle speed has decreased to 40 km/h or less, the process proceeds to step S4, and the resume function is canceled so that it will not operate even if the resume/accelerator switch 13 is pressed.

In the next step S5, it is determined whether the vehicle speed is Ok m/h, that is, whether the vehicle has stopped, and if the vehicle has not stopped, the resume function is canceled again in step S4. However, if it is determined in this step S5 that the vehicle has stopped, the process proceeds to step S6, after which the vehicle speed increases again to 40 km/h.
It is determined whether or not h has been exceeded. If this determination is No, the process returns to step S4 and the resume function is canceled, but if it is determined that the vehicle speed has exceeded 40 km/h again, the process proceeds to the next step S7.

In step S7, the timer 2b is started, and in the following step S8, the resume/acceleration (RESUME/ACC) is activated.
EL) Determine whether switch 13 has been operated. If there is a resume operation here, the resume function is activated in step S9, and then the process returns to step S2 to control constant speed travel based on the speed set in step SL.

If the resume operation is not performed in step S8, the process advances to step SIO, and it is determined whether or not the timer 2b started in step S7 has counted a certain period of time. If it is determined in step SIO that the predetermined time has not elapsed, the process returns to step S8, and it is determined again whether or not there is a resume operation. When the timer 2b has counted a certain period of time, the determination in step S10 is YES.
Therefore, the process proceeds to step Sll, erases the set speed in the memory 2a that was set in step S1, and ends this process.

As explained above, according to this embodiment, when the vehicle stops and exceeds the predetermined vehicle speed again, counting of the predetermined time is started,
If there is a resume operation during that time, the resume function will be activated, and if there is no resume operation, the set speed for constant speed driving will be erased as soon as a predetermined period of time has elapsed. This has the effect of allowing the resume function to resume smoothly.

(Effects of the Invention) As explained above, according to the present invention, after the vehicle has stopped,
When the vehicle speed becomes equal to or higher than the predetermined speed again, the set speed for constant speed driving is saved for a predetermined period of time, so the resume function can be easily resumed, resulting in an easy-to-use constant speed driving device.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a constant speed vehicle running device according to an embodiment of the present invention, FIG. 2 is a flowchart showing a control procedure in the embodiment, and FIG. 3 is a conventional constant speed running device for a vehicle. 3 is a flowchart showing a control procedure in the device. In the figure, 1...constant speed traveling control unit, 2...CPU
, 3... Constant voltage circuit, 4... Breaker, 9... Watchdog, 11... Vehicle speed input circuit, 14... Resume input circuit, 31... Actuator output circuit,
32... Output circuit monitor, 33... Throttle actuator. Patent applicant Mazda Motor Corporation

Claims (1)

[Scope of Claims] A constant speed traveling device for a vehicle having a resume function, comprising: a storage means for storing a set constant traveling speed; and after traveling at the constant speed, the vehicle speed increases from approximately zero to a predetermined speed or higher. vehicle speed detection means for detecting whether the vehicle speed has increased from approximately zero to a predetermined speed or higher; and resume detection means for detecting the presence or absence of an operation requesting activation of the resume function after the vehicle speed detection means detects that the vehicle speed has increased from approximately zero to a predetermined speed or higher; Constant-speed running for a vehicle, characterized in that it includes means for erasing the constant-speed running speed stored in the storage means when the resume detecting means cannot detect an operation requesting activation of the resume function within a predetermined time. Device.