JPS637898Y2 - - Google Patents

Description

[Detailed description of the invention] The invention detects when a driver is performing violent acceleration that exceeds a preset maximum allowable acceleration.
An object of the present invention is to provide a vehicle acceleration warning device that gives a warning to a driver.

In order to bring out the best driving performance in a vehicle such as a car, it is important to
There is a large amount of acceleration that can be tolerated depending on safety (driving on snowy roads, driving on snowy roads, etc.). If violent acceleration exceeding this maximum allowable acceleration is performed, not only will it be impossible to fully derive the intended vehicle performance, but the vehicle will be strained, and the vehicle performance and vehicle life will be adversely affected. Therefore, it is desired to develop a device that detects such violent acceleration and gives a warning to the driver.

The present invention provides a vehicle acceleration warning device that satisfies the above requirements by having the configuration described in the claims of the utility model registration.

Hereinafter, the configuration of the vehicle acceleration warning device of the present invention will be explained with reference to the embodiment shown in the drawings. 1 is a vehicle speed detector such as an electromagnetic pickup for detecting the vehicle speed; Alternatively, it is fed to the output shaft of the transmission, etc., and outputs a frequency signal proportional to the vehicle speed. The output of the vehicle speed detector 1 is connected to an F/V converter 3 via a waveform shaping circuit 2. This F/V
The converter 3 is a circuit that converts a frequency signal proportional to the vehicle speed sent from the vehicle speed detector 1 into a DC voltage proportional to the frequency, and its output voltage Vi
is outputted via buffer 4.

5 is an integrating circuit that integrates the constant voltage Vo,
Control to make the integral value equal to Vi is performed by a control circuit comprising a comparator 6, an analog switch 7, etc., which will be described later. As the integration circuit, a known circuit such as a Miller integration circuit or a bootstrap circuit is used, and by adjusting the variable resistor 13, the integration time constant GR, that is, the second
The structure is such that the slope α of the integral curve shown by the dotted line in the figure can be changed freely. The slope α of this integral curve gives the maximum allowable acceleration.

The comparator 6 is connected to the F/V converter 3 which indicates the vehicle speed.
The output voltage Vi of the output terminal is compared with the output voltage Vs of the integrating circuit 5. When Vi>Vs, the output voltage is OFF. When Vi<Vs, the output voltage is
The output of the analog switch 7 is turned on by the ON output, and the output voltage Vi of the F/V converter 3 is sent to the output terminal of the integrating circuit 5, and the output voltage Vs of the integrating circuit 5 is controlled so as to be equal to the Vi value at that time.
is turned ON, and Vs = Vi via analog switch 7
However, if the Vs value is smaller than the Vi value, the comparator 6 does not turn ON.

8 is a subtraction circuit, and the output voltage of the integration circuit 5
It subtracts Vs and the output voltage Vi of the F/V converter 3, that is, calculates Vi-Vs, and outputs the result as an excess of the maximum allowable acceleration.
Reference numeral 9 denotes a warning circuit consisting of a display 10, a comparator 11, an audio alarm 12, etc., which visually or audibly displays the excess of the maximum allowable acceleration sent from the subtraction circuit 8, and warns the driver. This is a circuit that gives a warning.

The device of the present invention having the above configuration has a variable resistor 1
3, the maximum permissible acceleration corresponding to the driving purpose such as economical and fuel-efficient driving is set as the slope α of the integral curve (see FIG. 2).

Now, when the car is running at a constant speed, the output voltage Vs of the integrating circuit 5 always tries to exceed Vi, but every time Vs slightly exceeds Vi, the comparator 6 is turned on and the analog switch 7 is turned on. is also turned on at the same time, and Vs is returned to the Vi value.
Therefore, when the vehicle is running at a constant speed, the output Vi of the F/V converter 3, which indicates the vehicle speed, and the integral output Vs of the integrating circuit 5 always match, as shown in FIG.

When performing sudden acceleration, F/
The output voltage Vi of the V converter 3 increases. For this reason,
Vi > Vs, comparator 6 turns OFF, and analog switch 7 turns OFF. Therefore, the output voltage Vs of the integrating circuit 5 has a slope α corresponding to the maximum allowable acceleration preset by the variable resistor 13.
rises. However, if the acceleration of the vehicle is smaller than the maximum allowable acceleration, the rate of increase of the output voltage Vi of the F/V converter 3, which indicates the vehicle speed, is smaller than the slope α of the integral curve, so the integral output Vs
increases while following and matching the output voltage Vi of the F/V converter 3. Therefore, when the acceleration is less than the maximum allowable acceleration, Vs = Vi always, the output of the subtraction circuit 8 becomes zero, and the warning circuit 9
does not give any warning. Now, when the acceleration of the car becomes larger than the maximum allowable acceleration mentioned above, the output voltage Vs of the integrating circuit 5 increases with a slope α indicating the maximum allowable acceleration, but Vi indicating the vehicle speed increases with a slope higher than that. , Vs and Vi no longer match, as shown in FIG. As a result, the subtraction circuit 8 treats the difference between both signals, that is, Vi-Vs, as an excess amount exceeding the set maximum allowable acceleration, and the warning circuit 9
send to The warning circuit 9 visually displays the subtraction result on a display 10, and when the result is judged by a comparator 11 and exceeds a predetermined value, a warning is issued by an audio alarm 12 to call the driver's attention.

Note that the above embodiment is activated to give a warning in the direction of speed increase, that is, when the acceleration is positive. However, when configured to issue a warning in the direction of deceleration, that is, when the acceleration is negative, the constant voltage Vo Reverse the polarity of
Just reverse the output of the comparator. Further, in the case of a configuration in which warnings are issued in both directions of speed increase and deceleration, the circuits for the positive and negative directions may be provided in parallel.

Since the present invention has the configuration and operation as explained above, when the driver performs violent acceleration that exceeds the maximum allowable acceleration preset according to the purpose, this is detected and the driver is informed. Since it can call attention to the vehicle, it can sufficiently bring out the intended performance of the vehicle, and has the remarkable effect of improving safety when the vehicle is running. Furthermore, if the preset maximum allowable acceleration is appropriately selected depending on the road surface condition, it is possible to know the slip condition on rough roads, snowy roads, etc., and this greatly contributes to the safety of the vehicle.

[Brief explanation of the drawing]

FIG. 1 is a block circuit diagram showing one embodiment of the vehicle acceleration warning device according to the present invention, and FIG. 2 is an explanatory diagram of the same operation. 1: Vehicle speed detector, 3: F/V converter, 5: Integrating circuit, 6: Comparator, 7: Analog switch, 8: Subtraction circuit, 9: Warning circuit, Vi: F/V
Converter output voltage, Vs: Integrator circuit output voltage.

Claims (1)

[Scope of utility model registration request] A vehicle speed detector that detects vehicle speed and outputs a frequency signal proportional to the vehicle speed, and an F/V that converts the frequency signal of the vehicle speed detector into a voltage signal proportional to the frequency.
a converter, an integrating circuit capable of arbitrarily adjusting an integral time constant for setting a maximum allowable acceleration, a subtracting circuit that performs subtraction between the output voltage of the integrating circuit and the output voltage of the F/V converter, and the subtracting circuit. A warning circuit that issues a warning according to the output of the circuit compares the output voltage of the F/V converter with the output voltage of the integrating circuit, and if the output voltage of the F/V converter is larger, F/V conversion is performed. The output voltage of the converter and the output voltage of the integrating circuit are sent as they are to the subtracting circuit, and when the output voltage of the F/V converter is smaller, the output voltage of the integrating circuit is controlled to be equal to the output voltage of the F/V converter. An acceleration warning device for a vehicle, comprising a control circuit.