JPH05296077A - Very low speed stating control device for vehicle - Google Patents

Abstract

PURPOSE:To provide a very low speed starting control device for a vehicle whereby starting a vehicle from its stop condition can be smoothly performed, for instance, by a creep phenomenon to effectively perform automatic guidance operation control or the like. CONSTITUTION:A VSV14 for increasing an idle speed of an engine is provided in a vehicle, and a driving current is supplied to this VSV14 at the time of closing a blower switch where an air conditioning system 11 is placed in an operative condition. A CPU 17 of a starting control circuit 16 inputs a start timing signal from an automatic guidance system 15 and a car speed pulse signal, so as to turn on a relay circuit 18 and also a transistor 19, in a very low speed decision condition of the vehicle. By turning on the transistor 19 together with turning on this relay circuit 18, the driving current is supplied to the VSV14, so as to perform control of increasing the idle speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extremely low speed start control device for a vehicle, for example, in an automatic guide operation device for a garage of a vehicle so that the start control of the vehicle can be smoothly performed during the start control of the guide operation.

[0002]

2. Description of the Related Art For example, there is an increasing demand for a system for automatically guiding a vehicle into a garage. In the case of configuring such an automatic vehicle guidance system, automatic steering control is performed so that the vehicle travels at an extremely low speed according to the guidance route obtained by a computer or the like and the vehicle travels along the guidance route. For example, in a vehicle using an automatic transmission, the vehicle is moved in a creeping state in which the foot is released from the accelerator pedal.

However, there is a situation in which, for example, when performing an automatic guidance operation for entering a garage or the like, the steering is largely turned while the vehicle is stopped and the vehicle starts from a fixed state. In this state, the vehicle starts with the front wheels of the vehicle largely directed to the side, so that the vehicle inevitably has a restoring force that tends to return the steering wheel to the neutral position.

[0004] When the vehicle is started in a state in which the restoring force of the steering wheel is counteracted, the load for shifting the vehicle from the stopped state to the moving state becomes large, and the vehicle is smoothly started with the torque obtained by the creep phenomenon. I can't do it.
If the driver depresses the accelerator pedal in such a state, the purpose of the automatic guidance operation cannot be achieved. For this reason, it is conceivable to attach a throttle actuator to increase the engine speed in such a situation, but for this purpose, it is necessary to greatly improve the vehicle.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and makes it possible to effectively use an existing system without setting a new system for a vehicle. It is an object of the present invention to provide an extremely low speed starting control device for a vehicle that enables smooth extremely low speed starting using creep, for example, from a stopped state.

[0006]

A very low speed starting control device for a vehicle according to the present invention is a vehicle equipped with an idle up system for increasing an idle speed of an engine in an idling state, and a starting command indicating a starting command of the vehicle. A start control means for generating a signal, a vehicle speed determination means for detecting the vehicle speed of the vehicle and comparing the detected vehicle speed with a set vehicle speed to determine that the vehicle is in an extremely low speed traveling state, and the start signal is confirmed. When the vehicle speed determination means determines that the vehicle is running at an extremely low speed, the rotation speed control means for activating the idle up system is provided.

[0007]

In the vehicle ultra-low speed starting control device configured as described above, for example, when a starting signal for automatic guidance operation is generated, the running speed of the vehicle at this time is detected and the running speed is stopped. When it is judged to be extremely slow including
For example, the idle-up system that is activated when the vehicle-mounted air-conditioning system is activated is activated, and the engine idle speed is controlled to increase. Therefore, in such a situation, sufficient driving torque can be obtained even by creep, and the vehicle can be started smoothly even if a large restoring force acts on the steering wheel, for example. In this extremely low speed state, automatic guidance operation such as garage entry can be smoothly executed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration. In this vehicle, an air conditioner system 11 is installed, and for this air conditioner system 11, the power source from an on-vehicle battery 12 includes a relay contact 131 of an air conditioner relay 13 and an idle up system. Vacuum switch valve (VS
V) 14 is supplied. The air conditioner relay 13 is configured such that the relay contact 131 is closed when a current flows through the relay coil 132 connected to the blower switch. When the blower switch is turned on, the current is supplied to the air conditioner system 11 and the VSV 14. Comes to flow.

Although not shown in detail, when a current flows through the VSV 14, the control valve of the bypass passage set in parallel with the throttle portion of the engine is opened to increase the intake amount corresponding to this bypass passage. Then, in the idle state in which the accelerator pedal is opened and the throttle valve is closed, the engine speed is increased so that a torque suitable for driving the air conditioner system 11 is obtained. That is, the idle speed is controlled to increase.

Such a structure is usually equipped in a vehicle equipped with the air conditioner system 11. When the air conditioner system 11 is set to operate, the engine is required to have a torque for driving the refrigerant compressor that constitutes the air conditioner system, and the idle speed of the engine is increased to increase the air conditioner system drive torque. We are able to respond to requests.

A start control circuit 16 to which a start timing signal from a vehicle automatic guidance control system 15 is supplied is set for the idle up system corresponding to such an air conditioner system 11. The start timing signal is
It is generated when execution of automatic guidance control is instructed in the automatic guidance system 15, and is output when the vehicle is started from a stopped state.

The start control circuit 16 includes a CPU 17 to which a start timing signal is supplied, and a vehicle speed pulse is further input to the CPU 17. This vehicle speed pulse is set for a wheel set on the vehicle, and is constituted by an output signal from a vehicle speed sensor that generates one pulse signal when the wheel is rotated by a specified angle.

The CPU 17 is a relay coil 18 of the relay circuit 18.
It controls the current flowing in 1, and by supplying an exciting current to the relay coil 181 of this relay circuit 18,
Relay contact 182 is closed. Also, this relay circuit 18
Is operated, the base current of the transistor 19 is controlled and the transistor 19 is set to the conductive state.

The relay contact 182 is connected to the battery 12, and when the contact 182 is closed, the battery 12 is connected to the VSV 14, and this V
SV14 comes to be grounded through the transistor 19. That is, the relay circuit is instructed by the CPU 16
18 is driven and the transistor 19 is set to be conductive.
A drive current is supplied to VSV14, and the idle speed of the engine is increased in this state.

FIG. 2 shows the flow of the operation of the device constructed as described above. In step 101, it is judged whether or not a start timing signal is generated from the automatic guidance system 15. For example, a start command for moving the vehicle along the guide route is generated in a state where the automatic guide operation of the vehicle such as garage parking is activated, and the start timing signal corresponds to the start command. Output from the automatic guidance system 15.

If the presence of the start timing signal is confirmed in step 101, that is, if the operation of the automatic guidance operation is confirmed, the process proceeds to step 102, the inputted vehicle speed pulse is counted, and the present vehicle speed is calculated. To do. Step 102
If the current vehicle speed is determined in step 103, the routine proceeds to step 103, where this vehicle speed is compared with a predetermined set vehicle speed, and it is determined whether or not the current vehicle speed has reached this set vehicle speed.

The automatic guidance control of the vehicle is started from the state in which the vehicle is stopped, so that the vehicle speed pulse signal is not initially generated. The vehicle speed pulse signal is generated by gradually moving the vehicle, and the vehicle traveling speed is measured by counting the vehicle speed pulse signals input to the CPU 17 within a certain time range. ..

In step 103, a preset specific vehicle speed, in this case, an extremely low speed vehicle speed (1-2 Km / h) traveling due to a creep phenomenon is compared with the measured current vehicle speed. If it is determined that the vehicle speed is within the range from the stopped state to the set vehicle speed, that is, if it is determined that the current vehicle speed has not reached the set vehicle speed, the process proceeds to step 104 and the relay circuit 18
Excitation current is applied to the relay coil 181 of the
Turn on. Also, in step 105, the transistor 19
Is controlled so that the drive current is supplied to VSV14 and the idle speed of the engine is controlled to increase.

That is, at the time of starting the automatic guidance control, in the case of the starting control with a large load that starts the steering from a state where the steering wheel is largely turned off, the creep phenomenon of the automatic transmission is utilized without the driver operating the accelerator. It is possible to smoothly start the vehicle.

When such a start control is performed and the vehicle speed rises and exceeds the set vehicle speed, the routine proceeds from step 103 to steps 106 and 107, and the contact 182 of the relay circuit 18 is set.
Is turned off and the transistor 19 is turned off, the current flowing through VSV14 is cut off, and the idle-up control is ended.
In this way, when the vehicle speed exceeds the set speed, the vehicle travels smoothly due to creep, and the automatic guidance operation proceeds smoothly.

In the device constructed as described above, extremely low speed traveling can be automatically realized from the starting state without the driver operating the accelerator pedal. In this case, smooth extremely low speed start control is possible without using a special system such as a throttle actuator and simply using an existing system set in association with the air conditioner system 11 or the like.

For example, by combining the start control device having such a structure with an automobile garage system, it is possible to smoothly realize a start with a large load such as a start from a stationary state. Since it is not necessary to install a system or the like, it can be easily realized at low cost.

Further, not only the automatic guidance control of the garage entry system but also the stop and start of the traffic jam tracking system at extremely low speed, the extremely low speed starting device can be applied as it is.

Further, in a vehicle using an automatic transmission and also in a vehicle using a manual transmission, extremely low speed starting control can be performed.

FIG. 3 illustrates the structure of such an extremely low speed starting device, which is an electronic control unit (EC) for starting control.
U) 20, steering sensor 21, throttle sensor 2
2. Input the signal from the shift position sensor 23, and further input the vehicle speed pulse signal from the vehicle speed sensor 24. Then, the relay circuit 18 shown in FIG.
By controlling the transistor 19 and the transistor 19, it is possible to configure a starting assist device from a state in which the driver largely turns the steering wheel.

FIG. 4 shows the flow of the control. In step 201, the current vehicle speed is obtained by counting the vehicle speed pulse signals. In step 202, it is determined whether or not the current vehicle speed is in the stopped state. If it is determined that the current vehicle speed is not in the stopped state, the process proceeds to step 203 and the current vehicle speed is set to a set threshold value (for example, 1 to 2 km / h). Determine if it is less than.

In steps 202 and 203, when it is determined that the vehicle is in the stopped state, or is not in the stopped state and is at an extremely low speed equal to or lower than the set threshold speed, the process proceeds to step 204 and the throttle sensor It is determined whether the reading is on and the transmission shift position is in the start state. Then, when it is determined that the vehicle is in an extremely low speed state and is in the start control state,
Furthermore, in step 205, from the reading of the steering sensor,
It is determined whether or not the steering wheel is in a state of being off from the center position by more than a threshold value.

In this way, if it is confirmed that the vehicle is traveling at an extremely low speed with the steering being largely turned, step 206
The relay circuit 18 is turned on to proceed to step 207, and the transistor 19 is turned on to proceed to step 207 so that a current is passed through the VSV 14 and the idle-up control is executed.

When the vehicle speed is higher than the threshold value, the starting condition is not set, and the steering is not greatly turned off, the relay circuit 18 is turned off and the transistor 19 is turned on in steps 208 and 209.
Is controlled so that the idle-up control is not performed.

That is, with such a configuration, the driver can start the vehicle from a state where the steering wheel is largely turned off and the acceleration control can be promptly performed, and the driving operation can be smoothly performed especially in the case of traffic jam.

[0031]

As described above, according to the vehicle ultra-low speed start control device of the present invention, the idle speed of the engine is controlled to be increased in a state where a large load is applied during the extremely low speed start. In addition, the automatic start control of the vehicle and the start control of the vehicle can be smoothly performed during the traffic jam operation.

[Brief description of drawings]

FIG. 1 is a configuration diagram illustrating an extremely low speed start control device for a vehicle according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating a flow of operations of the above apparatus.

FIG. 3 is a configuration diagram illustrating another embodiment of the present invention.

FIG. 4 is a flowchart illustrating the flow of operations in this embodiment.

[Explanation of symbols]

11 ... Air conditioner system, 12 ... Battery, 13 ... Air conditioner relay, 14 ... Idle-up VSV, 15 ... Automatic guidance system, 16 Start control circuit, 17 ... CPU, 18 ... Relay circuit, 19
… Transistors.

Claims (1)

[Claims] 1. A vehicle equipped with an idle up system for increasing an idle speed of an engine in an idle operating state, a start control means for generating a start signal indicating a start command of the vehicle, and detecting a vehicle speed of the vehicle, A vehicle speed determination means for comparing the detected vehicle speed with a set vehicle speed to determine that the vehicle is in an extremely low speed traveling state, and a start signal is confirmed by the start control means, and the vehicle speed determination means determines an extremely low speed traveling state. And a rotation speed control means for activating the idle-up system when it is determined that the extremely low speed start control device for a vehicle.