JPS6319843Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a device that automatically makes a vehicle run at a predetermined speed. In particular, the set speed of the vehicle is immediately transmitted to a notification device such as a voice synthesizer or a light display while the vehicle is running. This invention relates to an automatic speed control device that conveys information to the driver via the vehicle.

A conventional automatic speed control device has a circuit configuration as shown in FIG. 1, for example. The circuit configuration and its operation will be briefly explained. In the figure, reference numeral 1 denotes a control signal generation circuit, which is comprised of a switch circuit, etc., and when the switch is closed, a high level clear signal and start signal that rise slowly are output. 2 is an oscillator having an oscillation start control terminal S and an oscillation stop control terminal R, and is composed of an RS flip-flop, an astable oscillator, etc., and a high level start signal is supplied to the oscillation start control terminal S from the control signal generation circuit 1. oscillation is continued until a high level stop signal is supplied from comparator 6, which will be described later. 3 is a counter having a clear terminal CL; when a high-level clear signal is supplied from the control signal generating circuit 1 to the clear terminal CL, the clear signal becomes larger than the threshold of the counter, and the previous counting result is Cleared and set to zero. Thereafter, when the clear terminal CL becomes a low level state, the number of output pulses (output frequency) from the oscillator 2 is counted, converted into a binary signal, and output. Further, the counter 3 stops counting when the supply of output pulses from the oscillator 2 is stopped, and continues to output the counting results counted so far. 4 is a digital-to-analog converter which converts the binary signal from the counter 3 into an analog voltage. A comparator 6 compares the voltage from the digital-to-analog converter 4 with a voltage proportional to the actual running speed supplied from the outside to the input terminal 5, and when the two voltages match, it outputs a high-level stop signal. Feedback is provided to the reset terminal R of the oscillator 2 to stop oscillation. Further, the comparator 6 sets the output to a high level state when the voltage from the digital-to-analog converter 4 is higher than the voltage supplied from the outside to the input terminal 5, and sets the output to a low level state when it is smaller. is supplied to a valve drive circuit 8, which will be described later. Reference numeral 8 denotes a valve drive circuit, which is set by the driver by closing the switch of the control signal generation circuit 1, and is used to control the absolute difference between the set speed supplied to the input terminal 7 and the actual running speed. In response to the voltage proportional to the value and the output logic from the comparator 6, the opening/closing degree of the throttle valve (not shown) is adjusted based on these relationships.
That is, when the valve drive circuit 8 receives a high-level signal from the comparator 6, it opens the throttle valve by an amount corresponding to the absolute value of the difference between the set speed and the actual running speed, thereby accelerating the vehicle. . Further, when a low level signal is supplied from the comparator 6, the throttle valve is closed by an amount corresponding to the absolute value to decelerate the vehicle. Further, when the voltage supplied to the input terminal 7 is zero, the throttle valve maintains the degree of opening corresponding to the set speed regardless of the state of the output of the comparator 6. For example, when you want to automatically drive at a constant speed, when you close the switch of the control signal generation circuit 1, a high-level clear signal is supplied to the clear terminal CL of the counter 3, and the counter 3 is cleared.
Further, a high level start signal is supplied to the start terminal S of the oscillator 2, and the oscillator 2 is caused to oscillate at a predetermined oscillation frequency. This oscillation frequency is counted by a counter 3 and converted to a digital-to-analog converter 4.
The binary signal from the counter 3 is converted into a predetermined voltage via the switch, and the vehicle speed is set by closing the switch. When this converted voltage and the voltage supplied to the input terminal 5 are compared by a comparator 6, the comparator 6 generates a high level signal to open the throttle valve or a low level signal to close the throttle valve. It is supplied to the valve drive circuit 8.
Then, the valve drive circuit operates the throttle valve in the direction of opening or closing in proportion to the voltage that is supplied to the input terminal 7 from the outside and is proportional to the absolute value of the difference between the set speed and the actual running speed. A vehicle is accelerated or decelerated to make it travel at a constant speed.
In this way, in conventional devices, when the set speed is set by pressing the speed setting switch during acceleration, the speed is controlled by feedback, so the set speed is gradually increased and decreased around the set speed. It took some time for the speed to reach a constant speed. For this reason, the driver must check the speedometer and confirm the correct set speed only after this predetermined time has elapsed. Furthermore, in order to confirm the set speed, the driver must keep an eye on the speedometer while driving, which is not very desirable from the point of view of safe driving.

The present invention was devised to eliminate this kind of drawback of the conventional technology, and uses an external speed reading circuit to simultaneously transmit a number of pulses proportional to the set speed counted by a counter in the automatic speed control device. It is an object of the present invention to provide an automatic speed control device that can read accurate speed setting information to a driver.

The present invention will be explained below based on the embodiment shown in FIG. The same reference numerals in the figures represent the same functions, and their explanations will be omitted. In FIG. 2, a counter 3 and a digital-to-analog converter 4 are integrated into one chip, and another counter (speed reading circuit) 12 and a sound synthesis device 13 are installed on a separate board from other circuits and installed inside the vehicle via lead wires. This example explains the case where the cables are wired together. First, reference numeral 9 denotes a first buffer that shapes the waveform of a clear signal with a gradual rise from the control signal generation circuit 1, amplifies the current, and supplies the signal to the counter 3 and a second buffer 10, which will be described later. The clear signal from the first buffer 9 is current-amplified by the second buffer 10 and is supplied to the clear terminal CL of the other counter 12.
Here, the second buffer 10 prevents the counter 3 from malfunctioning due to noise induced in the lead wire. A third buffer 11 amplifies the output pulse (output frequency) of the oscillator 2 and supplies it to another counter 12. Here, the second
When a high level clear signal is supplied from the buffer 10 to the other counters 12, the counts of the other counters 12 are cleared and become zero. Thereafter, when the clear terminal CL of the other counter 12 becomes low level, the pulses from the third buffer 11 are counted, converted into a binary signal, and output. Reference numeral 13 denotes a voice synthesis device (notification device) which, when triggered by a high-level start signal from the control signal generation circuit 1, inputs the binary signal from the other counter 12, and after a predetermined time, outputs this binary signal. It's in audio. Note that the counter 3 and other counters 12 are elements that operate with both edge triggers and level triggers, and when clear signals are supplied from the first buffer 9 and second buffer 10 to their respective clear terminals CL, their rising edge Sometimes counters 3 and 12 are cleared at the same time. Further, in the above embodiment, the voice synthesizer 13 is activated by a start signal, but a clear signal or a stop signal from the comparator 6 may also be used. Also, the speech synthesizer 1
There is no functional difference even if an optical indicator is used instead of 3. Furthermore, although the second buffer 10 and the third buffer 11 are used in the above embodiment, they are unnecessary when the counter 3 and the other counter 12 are provided on the same substrate. In addition to the counter 3, another counter 12 having the same configuration is used, but the binary signal from the counter 3 may be directly input to the notification device 13 such as a speech synthesis device. At this time, the second buffer 1
0 and the third buffer 11 are no longer needed.

As described above, the present invention has an oscillation start control terminal S and an oscillation stop control terminal R, and when a start signal is supplied to the oscillation start control terminal S, the oscillation operation starts, and the oscillation stop control terminal R Oscillator 2 stops oscillation when a stop signal is supplied to
a counter 3 which has a clear terminal CL and counts the output frequency of the oscillator 2 after a clear signal is supplied to the clear terminal; and a control signal generator which outputs the clear signal CL and the start signal S by a switch operation. A comparator 6 is provided which compares the counting result of the counter 3 with a vehicle speed signal and supplies a stop signal to the oscillation stop control terminal R of the oscillator 2 when the two match. An automatic speed control device that controls vehicle speed by a counter 12 having a clear terminal CL and counting the output frequency of the oscillator 2 after a clear signal is supplied to the clear terminal; According to the present invention, the automatic speed control device is characterized in that it is equipped with a notification device 13 that notifies the counting results by voice or light display. In addition to accurately informing the driver, information is automatically output while driving using means such as a voice synthesizer or optical display, so there is no need to be distracted by the speedometer, etc., making driving safer. The psychological effect on safety, such as ensuring adequate driving, is extremely large.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the circuit configuration of a conventional automatic speed control device, and FIG. 2 is a block diagram showing one embodiment of the present invention. 1... Control signal generation circuit, 2... Oscillator, 3,
12...Counter, 4...Digital/analog converter, 6...Comparator, 8...Valve drive circuit,
13...Speech synthesis device (notification device).

Claims (1)

[Scope of utility model registration request] It has an oscillation start control terminal S and an oscillation stop control terminal R, and starts the oscillation operation when a start signal is supplied to the oscillation start control terminal S, and when a stop signal is supplied to the oscillation stop control terminal R. An oscillator 2 that stops oscillation operation, and a counter 3 that has a clear terminal CL and counts the output frequency of the oscillator 2 after a clear signal is supplied to the clear terminal.
Then, the control signal generation circuit 1 outputs the clear signal and start signal by switch operation, and the counting results of the counter 3 are compared with the vehicle speed signal, and when the two match, the oscillation stop control terminal R of the oscillator 2 is output. comprising a comparator 6 for supplying a stop signal;
An automatic speed control device that controls vehicle speed based on the output of the comparator 6, having a clear terminal CL,
Another counter 1 counts the output frequency of the oscillator 2 after a clear signal is supplied to the clear terminal.
2, and a notification device 13 that notifies the counting result from the other counter by audio or optical display.