JPS5832411B2 - Automatic constant speed traveling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic constant speed traveling system, and more particularly to an improvement in an automatic constant speed traveling system including a speed control circuit that can arbitrarily drive a vehicle at a constant speed at a desired set speed.

An automatic constant speed driving device is a device that, when a desired set speed is set while driving a car, can automatically control the vehicle speed and maintain it at a constant speed without having to press the accelerator pedal.

According to this device, driver fatigue and automobile fuel consumption can be reduced during continuous constant speed driving on expressways and the like.

Several types of automatic constant speed driving devices have already been proposed, and their basic configuration is to compare the stored value in the memory circuit set by the speed command signal with the vehicle speed voltage of the vehicle, and to increase or decelerate the speed based on the output of this comparison value. It supplies a signal to the actuator that moves the carburetor.

In normal automatic constant speed driving devices, a high speed setting limit is set to ensure driving safety, and if the vehicle speed exceeds this limit, automatic constant speed driving cannot be set, and after setting, the vehicle speed or this limit is set. In conventional devices, this high speed setting limit is set at about 120 m/hour.

Although the maximum constant speed limit in Japan is generally 100 ICIn/hour, the high speed setting limit of conventional equipment is 120/z.
The reason for this is that it takes into consideration the complexity of having to cancel the set every time there is a temporary overtaking acceleration, and also that the set can be canceled when the vehicle speed exceeds the limit for temporary deceleration control on a downhill slope, etc. This is to prevent this from happening.

However, depending on the mode of use, the high speed setting limit of the conventional device allows automatic constant speed running to exceed the maximum constant speed limit, which is extremely dangerous.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide an automatic constant speed traveling device having a high speed setting limit that is set separately from the set release vehicle speed for automatic constant speed traveling.

In order to achieve the above object, the present invention includes a comparison circuit that compares a vehicle speed signal with a predetermined high speed limit signal, and an output of the comparison circuit that is connected in series with a set switch and disables the set switch when the vehicle speed exceeds the high speed limit signal. The invention is characterized in that it includes a gate circuit that performs the following steps.

Preferred embodiments of the present invention will be described below based on the drawings.

The figure shows a schematic block diagram of an automatic constant speed traveling device according to the present invention.

The rotational speed of the engine 10 is converted into an electrical vehicle speed signal by a vehicle speed detection circuit 12.

The vehicle speed detection circuit 12 includes a detection section 14 and a conversion section 16.

The detection unit 14 includes a reed switch built into the speed make and a magnet rotated by the speed make cable, and generates a pulse signal proportional to the vehicle speed by turning the reed switch on and off.

The output pulse signal of the detection unit 14 is transmitted to the conversion unit 1 including an integrating circuit.
6, it is converted into a DC smooth signal.

Although not shown in detail, the vehicle speed control circuit 18 has a well-known circuit configuration, and by comparing the vehicle speed signal of the vehicle speed detection circuit 12 with a set value, increases/decelerates signals to keep the vehicle speed at the set value to the speed increasing relay 20. and is supplied to the deceleration relay 22.

The vehicle speed control circuit 18 is provided with a memory circuit, and the vehicle speed when the speed command signal is applied is stored in the memory circuit as a set value.

After this, this stored value is compared with the vehicle speed signal, and if the vehicle speed has decreased below the set value, a speed increase signal is sent to the speed increase relay 20, and if the vehicle speed has exceeded the set value, a deceleration signal is sent to the speed increase relay 20. is supplied to the deceleration relay 22.

A speed command signal to the vehicle speed control circuit 18 is sent via a gate circuit 30 to a manual set switch 24, and when the driver arbitrarily presses the set switch 24, automatic constant speed driving is started.

The actuator 26 including the forward/reverse morph is rotated by the operation of the speed increase relay 20 and the deceleration relay 22, and as a result, the throttle opening of the carburetor reflex 28 is controlled.

The rotational speed of the engine 10 is then controlled to keep the vehicle speed constant.

The vehicle speed control circuit 18 is provided with a high-speed limit circuit, and the high-speed limit is set to about 120 b/hour to enable high-speed travel such as overtaking acceleration.

Therefore, while the vehicle is traveling below this high speed limit, the set is not released due to vehicle speed.

The gate circuit 30 consists of a transistor 32 and resistors 34 and 36. When the transistor 32 is on, the set switch 24 is enabled, and when the set switch 24 is turned on, the value stored in the vehicle speed control circuit 18 is set at the vehicle speed at that time. The vehicle speed is set, and automatic constant speed driving at this vehicle speed is started from then on.

However, when the transistor 32 is in the off state,
A signal from the set switch 24 is not supplied to the vehicle speed control circuit 18, and automatic constant speed driving is not performed.

On/off control of the gate circuit 30 is performed by a comparison circuit 38.

The comparison circuit 38 includes a differential amplifier 40 and voltage dividing resistors 42, 44,
It is formed from a feedback resistor 46 and a smoothing capacitor 48.

The stabilized voltage supplied from the constant voltage power supply terminal 50 is divided by the voltage dividing resistors 42 and 44 and is supplied to one input terminal of the differential amplifier 40 as a high speed limit signal corresponding to a predetermined high speed limit vehicle speed. .

The high speed limit vehicle speed can be selected to be 1100 k/hour or less, or can be arbitrarily selected by connecting a variable resistor to the voltage dividing resistor circuit.

A vehicle speed detection circuit 12 is connected to the other input terminal of the differential amplifier 40.
A vehicle speed signal from the vehicle is provided and this vehicle speed signal is compared to a high speed limit signal.

When the vehicle speed is lower than the high-speed limit vehicle speed, the output of the comparator circuit 38 has a value higher than the operating voltage of the transistor 32, and the gate circuit 30 is turned on.

Therefore, the signal from the set switch 24 can be supplied to the vehicle speed control circuit 18, and switching to automatic constant speed driving is possible.

On the other hand, if the vehicle speed is higher than the high speed limit vehicle speed, the comparison circuit 3
The output of transistor 8 has a value lower than the operating voltage of transistor 38, and the gate circuit is turned off.

Therefore, the set switch 24 is disabled, and switching to automatic constant speed driving becomes impossible.

As described above, according to the present invention, the vehicle speed that can be set for automatic constant speed driving can be limited to a maximum speed limit or less, thereby ensuring safe driving.

Furthermore, even if the vehicle is temporarily driven at a high speed exceeding the maximum speed limit, the set is not released, and an automatic constant speed traveling device with extremely good operability can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS The figure is a circuit diagram showing a preferred embodiment of the automatic constant speed traveling device according to the present invention. 12...Vehicle speed detection circuit, 18...Vehicle speed control circuit, 24...Set switch, 30...
...Gate circuit, 38...Comparison circuit.

Claims (1)

[Claims] 1. A vehicle speed detection circuit for obtaining an electric signal proportional to the vehicle speed, a speed control circuit connected to the vehicle speed detection circuit to arbitrarily drive the vehicle at a desired set speed, and a desired speed command signal to the speed control circuit. With a manual set switch that gives
An automatic constant speed traveling device that includes a comparison circuit that compares a vehicle speed signal from a vehicle speed detection circuit with a predetermined high speed limit signal, and a gate circuit that is connected in series to a set switch and is on/off controlled by the output of the comparison circuit.