JPH0538964A - Vehicular constant speed travel device - Google Patents

Abstract

PURPOSE:To judge the necessity of down-shift from the accelerated state of a vehicle so as to perform appropriate acceleration by providing a controller with an acceleration control means, an accelerated state judging means and a down-shift judging means. CONSTITUTION:In a controller 8 for controlling engine output and an automatic transmission 5, first target acceleration alpha1 is set to perform acceleration from the time instant t1 when a reset control switch 18 or an accelerating switch 19 is operated. In the case of judging the actual acceleration alpha to have reached the first target acceleration alpha1 in the time instant t2 after the lapse of the specified time T1, second target acceleration alpha2 is set to perform acceleration without commanding down-shift. In the case of the actual acceleration not having reached the first target acceleration, the controller 8 commands down- shift to the automatic transmission 5 to perform sharp acceleration. Also on the second target acceleration alpha2 the necessity of down-shift is judged in the same way to perform appropriate acceleration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle constant speed traveling device for controlling a throttle opening so that an actual vehicle speed becomes a target vehicle speed, and more particularly, to controlling the vehicle speed in response to an operation of a return device switch or a speed increasing operation switch. The present invention relates to a vehicle constant-speed traveling device that is accelerated to perform constant-speed traveling after completion of acceleration.

[0002]

2. Description of the Related Art Conventionally, as disclosed in, for example, Japanese Unexamined Patent Publication (Kokai) No. 58-127220, means for detecting acceleration of a vehicle body is provided, and the acceleration detecting means is operated when a return operation switch (resume switch) is operated. In response to the output from
Only when the acceleration does not reach the preset target acceleration, the transmission is downshifted to perform rapid acceleration.
Other than that, there is known a vehicle constant-speed traveling device that prevents unnecessary sudden acceleration without downshifting.

[0003]

However, in the conventional constant-speed traveling device that performs the above-described control, if the value of the set target acceleration is too low, a downshift rarely occurs, resulting in insufficient acceleration. On the other hand, if the target acceleration value is too high, there is a problem that frequent downshifts cause discomfort to the occupants even though the downshift is not required. It was difficult.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a constant speed traveling device for a vehicle, which can accurately determine whether or not a downshift is necessary based on the acceleration state of the vehicle and perform appropriate acceleration.

[0005]

In order to achieve the above object, a vehicle constant speed traveling device according to the present invention has a first target acceleration for a predetermined time after a return operation switch or a speed increase operation switch is operated. Is set to perform acceleration control, and after a predetermined time has elapsed, the downshift is performed only when the actual acceleration of the vehicle body has not reached the first target acceleration, and after this downshift, it is higher than the first target acceleration. The second target acceleration is set and acceleration control is performed.

That is, according to the present invention, the acceleration detecting means for detecting the acceleration of the vehicle body and the first target acceleration are set for a predetermined time after the return operation switch or the speed increasing switch is operated. Acceleration state determination for determining the acceleration state of the vehicle by comparing the acceleration control means for accelerating toward acceleration and the actual acceleration detected by the acceleration detection means with the first target acceleration after the lapse of the predetermined time. Means and downshift determining means for downshifting the transmission when the acceleration state determining means determines that the actual acceleration has not reached the first target acceleration. After the down, a second target acceleration higher than the first target acceleration is set, and acceleration is performed toward the second target acceleration.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an overall configuration diagram of an embodiment of the present invention. In the figure, a throttle valve 3 for adjusting an intake air amount is provided in an intake passage 2 of an engine 1, and the throttle valve 3 is driven to open and close by a throttle actuator 4 to control its opening. Further, the automatic transmission 5 has a plurality of shift solenoids 6a to 6c and a lockup solenoid 7, and the shift solenoids 6a to 6c are turned on.
The hydraulic circuit is switched by the combination of turning off and the plurality of hydraulic fastening elements are selectively fastened, whereby the transmission mechanism is controlled to be switched to a plurality of shift stages. Further, a lockup clutch (not shown) in the torque converter is engaged or released by turning on / off the lockup solenoid 7.

As the throttle actuator 4, for example, a motor type actuator or a negative pressure type actuator is used. The actuator 4 and the automatic transmission 5 are controlled by the controller 8.

The controller 8 performs engine output control and gear shift control by throttle control via the actuator 4, outputs a throttle valve control signal A to the throttle actuator 4 for throttle control, and automatically controls the automatic transmission 5. In order to control the shift control, the shift control signals B and C are output to the shift solenoids 6a to 6c and the lockup solenoid 7, respectively. When the throttle actuator 4 is a negative pressure type, the throttle valve control signal A is composed of a release control signal A ₁ and a pull control signal A ₂ which are respectively input to its release control valve and pull control valve (both not shown). , Release control signal A ₁ and pull control signal A ₂
Is a pulse signal for variably controlling each opening of the release control valve and the pull control valve according to the duty ratio.

The controller 8 includes a throttle valve 3
In order to control the automatic transmission 5 and the automatic transmission 5, the vehicle speed signal Vn from the vehicle speed sensor 9 that detects the vehicle speed (actual vehicle speed) and the accelerator opening from the accelerator sensor 11 that detects the depression amount (accelerator opening) of the accelerator pedal 10 are opened. Degree signal AO, the brake signal BR from the brake switch 12 that detects a brake operation, the throttle opening signal TH from the throttle sensor 13 that detects the opening of the throttle valve 3, and the shift position of the automatic transmission 5. The gear position signal GP from the gear position sensor 14 and the shift mode signal M from the mode switch 15 are input, respectively, and the main switch 1 is used as a constant speed traveling operation switch.
6, set switch 17, return operation (resume) switch 18, speed-up operation switch 19, coast switch 2
Operation signals (ON, OFF) from 0 are input respectively. The main switch 16 is for turning on the power source of the constant speed traveling device to put the entire system in a standby state, and the set switch 17 is for setting a desired target vehicle speed Vs. Switch 1
Reference numeral 8 is for performing constant speed traveling at the target vehicle speed Vs before releasing again after releasing the constant speed traveling device. The speed increasing operation switch 19 sets the target vehicle speed Vs to the high speed direction during the constant speed traveling control. The coast switch 20 is for performing desired deceleration during the constant speed traveling control.

In this constant speed traveling device, as shown in FIG. 2, the controller 8 starts the first operation from the time t ₁ when the return operation switch 18 or the speed increase operation switch 19 is operated.
Target acceleration α ₁ is set and acceleration control is performed, and at time t ₂ when a predetermined time T _{1 has} elapsed, vehicle body acceleration α = dVn
Comparing / dt with the first target acceleration α ₁ . And
If the vehicle body acceleration α reaches the _first target acceleration α ₁ as shown by the solid line in FIG.
In contrast, the second target acceleration α ₂ is set and acceleration control is performed while the current gear stage is maintained without issuing a downshift command signal. On the other hand, if the vehicle body acceleration α at the time point t ₂ has reached the _first target acceleration α ₁ as shown by the chain line in FIG. 2, the controller 8 issues a signal for instructing the automatic transmission 5 to shift down. Shift down and perform sudden acceleration. As is apparent from FIG. 2, there is a slight time lag from when the controller 8 issues a signal for instructing the automatic transmission 5 to shift down and when the automatic transmission 5 is actually downshifted. ..

[0013] In the next time t ₂ time t ₃ after a predetermined time T ₂ has elapsed from a comparison between the _second body acceleration alpha and the second target acceleration alpha, vehicle acceleration alpha is as shown by the solid line in FIG. 2 Second
If not reached the target acceleration alpha ₂ cancels the cruise control, the vehicle acceleration alpha performs second cruise control when it has reached the target acceleration alpha ₂ as indicated by a chain line in FIG.

Therefore, as shown in FIG. 3, the controller 8 includes the acceleration detecting means 21 for calculating the vehicle body acceleration α based on the vehicle speed signal Vn from the vehicle speed sensor 9 and the timer for measuring the time points t ₂ and t _3. Means 22, acceleration state determination means 23 for determining the acceleration state at time points t ₂ and t ₃ , and target vehicle speed Vs and actual vehicle speed V set by the set switch 17.
A speed deviation judging means 24 for judging a speed deviation from the difference ΔV from n and a shift down judging means 25 for judging the necessity of downshifting based on the outputs of the acceleration state judging means 23 and the speed deviation judging means 24. ing.

Next, an outline of the basic constant speed traveling control by the controller 8 will be described with reference to the flowchart of FIG.

FIG. 4 is a main routine. The controller 8 performs a predetermined system initialization at the start of operation (S1), reads detection signals from the various sensors, and inputs various kinds of information necessary for control from these. S
2).

In step S3, it is determined whether or not the conditions for starting the automatic speed control (ASC) including the constant speed running control are satisfied. The starting condition of the automatic speed control is that the main switch 16 is ON. The shift position of the transmission 5 is in the D range and the vehicle speed Vn is equal to or higher than a set value (for example, 40 km / h). Also, the condition to cancel the automatic speed control is
This is the case when the above starting conditions are not satisfied or when the brake is activated.

When the automatic speed control condition is satisfied, the automatic speed control is started and the set switch 17, the return operation switch (resume switch) 18, the speed increasing operation switch 19 and the coast switch 20 are operated, and the accelerator and A mode setting control such as a vehicle speed feedback control mode or an accelerator acceleration mode is performed corresponding to the brake operation (S4), and a target throttle opening degree setting control corresponding to each mode is performed (S5). When the automatic speed control condition is not satisfied, the process normally shifts to throttle control to set and control the throttle opening based on the accelerator operation amount.

The throttle control signal A corresponding to the target throttle opening set in S5 or S6 as described above is output to the throttle actuator 4 (S7), and the throttle valve 3 is operated to the target opening TO, and Each of the solenoids 6a to 6 of the automatic transmission 5 is set by setting the shift speed according to the vehicle speed Vn, the throttle opening TH, the accelerator opening AO, etc.
Shift control for outputting control signals B and C to c and 7 is performed (S8), and the above routine is executed for a predetermined time (for example, 30 msec).
Execute every time.

In the vehicle speed feedback control mode, the actual vehicle speed Vn is converged to the target vehicle speed Vs by PI-PD calculation or the like based on the deviation ΔV between the actual vehicle speed Vn and the target vehicle speed Vs and the change amount of the actual vehicle speed Vn. The throttle opening TV required for this purpose is calculated, and this is set as the target throttle opening TO, and feedback control is performed.

When the brake is operated during the vehicle speed feedback control, the vehicle speed feedback control is stopped and the normal throttle mode is entered.

In the normal throttle control mode, the accelerator opening AO and the speed change mode M (economy,
(Normal, power) is input, a basic throttle opening map corresponding to the shift mode is selected, and a basic throttle opening TB corresponding to the gear position is calculated for the accelerator opening AO detected from this map, and the accelerator opening is calculated. Various corrections such as stepping speed correction, vehicle speed correction, water temperature correction,
The corrected throttle opening is set as the target throttle opening TO.

Further, when the accelerator depression operation is performed for a predetermined value (AO = 5%) or more during the constant speed running control, the accelerator acceleration mode is entered. In the accelerator acceleration mode, the target throttle opening degree TV corresponding to the target vehicle speed Vs in the vehicle speed feedback control so far is input, and the basic throttle opening degree TB corresponding to the depressed accelerator opening degree AO is preset. The sum TV + TB of the two is set as the target throttle opening TO, which is obtained from the existing map.

As described above, during the constant speed running control, the return operation switch 18 or the speed increase operation switch 1 is operated.
9 is the vehicle body acceleration alpha from being operated after a predetermined time has performed downshift only when it does not reach the first target acceleration alpha _1, 5 and 6 the control routine that the controller 8 is carried out when the It will be described according to the flowchart.

First, in FIG. 5, the controller 8 checks whether or not the constant speed running control is being performed (S11), and if the constant speed running control is not being performed, it is checked whether or not the return operation switch 18 is turned on (S12). ). When it is determined that the return operation switch 18 is turned on at time t ₁ , the constant speed traveling control is started (S13), and the timer is set to the first set time T ₁
Is set (S14), the first target acceleration α ₁ is set, and acceleration control is performed so that the actual acceleration α reaches the first target acceleration α ₁ (S15). Then, it is checked whether or not this timer has timed out, and the path of S16 → S11 → S17 → S16 is circulated until the timer times out.

At a time point t ₂ when the set time T ₁ has elapsed from the time point t ₁ and the timer has timed up, the timer is reset (S18), and the process proceeds to FIG. 6 and the vehicle body acceleration α and the first target acceleration α ₁ are set. The comparison is made (S19). At this time, if α ≧ α ₁ , the second target acceleration α ₂ is set, and the acceleration control is performed so that the actual acceleration α becomes the second target acceleration α ₂ .
Returning to S11, if α <α ₁ , command downshift to the automatic transmission 5 (S21), and if the second set time T ₂ is not set in the timer (S22), this set time is set. A timer is set at T ₂ (S23), a second target acceleration α ₂ is set, and acceleration control is performed (S24).
Then, it is checked whether or not this timer has timed out, and until the timer times out, S25 → S11 → S1
It circulates in the path of 7 → S26 → S25.

The elapsed set time T ₂ from the time point t ₂ timer resets the timer at the time point t ₃ the time is up (S27), compares the _second body acceleration alpha and the second target acceleration alpha, (S28 ), If α <α ₂ , the constant speed traveling control is released (S29) and the process returns to S11. If α ≧ α ₂ , the process proceeds to S30 through S28 → S11 → S17 → S26, and it is checked whether or not the speed increasing operation switch 19 is operated. If the speed increasing operation switch 19 is operated,
It is checked whether or not the switch 19 is turned from ON to OFF (S31), and when it is turned OFF, the target vehicle speed Vs is set (s32), the process proceeds to S14 again, the timer is set, and the above flow is repeated. To do.

[0028]

As described above, the vehicle constant-speed traveling apparatus according to the present invention sets the first target acceleration for a predetermined time after the return operation switch or the speed increase operation switch is operated, and controls the acceleration. After a predetermined time has elapsed, the downshift is performed only when the actual acceleration of the vehicle body has not reached the first target acceleration, and after this downshift, the second target acceleration higher than the first target acceleration. Since the acceleration control is performed by setting, the vehicle engine load condition can be accurately grasped from the throttle opening. Therefore, it is possible to accurately determine the necessity of downshifting and perform appropriate acceleration.

[Brief description of drawings]

FIG. 1 is an overall schematic diagram showing an embodiment of the present invention.

FIG. 2 is a timing chart for explaining the operation of the device of the present invention.

FIG. 3 is a block diagram showing a part of a controller.

FIG. 4 is a flowchart showing a basic flow of constant speed traveling control.

FIG. 5 is a part of a flow chart for explaining the operation of the device of the present invention.

FIG. 6 is the remaining part of the flow chart used to explain the operation of the apparatus of the present invention.

[Explanation of symbols]

 3 Throttle valve 4 Throttle actuator 5 Automatic transmission 6a-6c Shift solenoid 7 Lockup solenoid 8 Controller 9 Vehicle speed sensor 11 Accelerator sensor 12 Brake switch 13 Throttle sensor 14 Gear position sensor 17 Set switch 18 Return operation switch 19 Speed increase operation Switch 20 Coast switch 21 Acceleration detection means 22 Timer means 23 Acceleration state determination means 24 Speed deviation determination means 25 Downshift determination means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Satoru Ando, 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Mazda Co., Ltd. (72) Inventor, Takeshi Yamane, 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Nardeck shares In the company

Claims (1)

[Claims] 1. A vehicle constant speed traveling apparatus for controlling a throttle opening so that an actual vehicle speed becomes a target vehicle speed, an acceleration detecting means for detecting an acceleration of a vehicle body, and a return operation switch or a speed increasing operation switch are operated. The first target acceleration is set for a predetermined time after the start of the acceleration, and the acceleration control means for accelerating toward the first target acceleration and the actual acceleration detected by the acceleration detection means after the predetermined time has elapsed. An acceleration state determining means for comparing the acceleration with the first target acceleration to determine the acceleration state of the vehicle; and the acceleration state determining means for determining that the actual acceleration has not reached the first target acceleration. , A downshift determination means for downshifting the transmission, and the acceleration control means, after the downshift, a second target acceleration higher than the first target acceleration. Set the vehicular constant-speed running device, characterized in that an acceleration toward the second target acceleration.