JPH0230735Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a vehicle fluid level measuring device that measures and displays the amount of fluid such as fuel in a vehicle.

As a conventional vehicle liquid level measuring device, there is one shown in FIG. 1, for example. In FIG. 1, 1 is a liquid level sensor, 2 is a pergraph type fuel indicator, 3 is an amplifier, 4 is a delay circuit, 5 is a preset circuit, 6 is a power supply circuit, 7 is an OR circuit,
B is the battery, SW1 is the ignition switch, and SW2 is the lighting switch. This liquid level measuring device for vehicles cancels the delay operation of the delay circuit 4 for averaging liquid level fluctuations via the preset circuit 5 when the ignition power or light power is turned on, and the liquid level is measured only when the power is turned on. It is designed so that the amount can be read quickly.

However, in the case of such conventional vehicle fluid level measuring devices, when refueling is performed at night, etc., without turning off the light power, that is, without turning off the head lamp or small lamp, only the ignition power is turned off and the engine is stopped. Since the power supply circuit 6 is configured to take the logical sum of the light power supply and the ignition power supply, the display 2 is in a state where it can continue to operate, but because of the delay caused by the delay circuit 4, the displayed index is There was a problem in that the oil supply did not rise quickly and the refueling status could not be known without delay.

This idea was created by focusing on these conventional problems, and when attempting to refuel at night with the ignition switch turned off and the lighting switch left on, the ignition power is turned off. The purpose of this invention is to solve the above problem by canceling the delay operation for a predetermined time after detection.

This invention will be explained below based on the drawings. FIG. 2 is a diagram showing an embodiment of this invention.

First, to explain its configuration, 1 is a liquid level sensor, 2 is a bar graph type fuel indicator, 3 is an amplifier for driving the indicator 2 based on the signal from the liquid level sensor 1, and 4 is a liquid level sensor. 5 is a delay circuit that delays the signal of 1 with a large time constant; 5 is a preset circuit that cancels the delay of delay circuit 4 when the power is turned on (when the write power or ignition power is turned on); 6 is a power supply circuit that supplies power to each part. . 7 is an OR circuit, and 8 is a certain period of time after detecting the OFF state of ignition switch SW1 (a time set based on the assumption that the fluid level fluctuation that occurs immediately after stopping the car at a gas station to refuel is stabilized) ) is a timer circuit for continuing the delay and then canceling the delay of the delay circuit 4 for a predetermined period of time.

Next, the operation of one embodiment of this invention will be explained. When moving the vehicle, first turn on the ignition switch
Turn on 1 and drive the engine. At this point, the delay of the delay circuit 4 is canceled by the preset circuit 5, the fuel amount is immediately displayed, and it is delayed during the subsequent running. Assume that the ignition switch SW1 is turned off to refuel after driving at night. At this time, the lighting switch
SW2 is kept on in order to monitor the display. Then, the timer circuit 8 operates upon detecting that the ignition switch SW1 is turned off, and the delay operation of the delay circuit 4 for delaying after a certain period of time is canceled, and the display changes depending on the refueling speed.

As explained above, this invention consists of a liquid level sensor 1 that outputs an analog signal of a size corresponding to the liquid level, and an average of the output signal of the liquid level sensor 1 with a large time constant and a delay. a delay circuit 4 that outputs the signal, a display 2 that inputs the output signal of the delay circuit 4 and displays the liquid level according to the magnitude thereof, and an ignition switch SW.
The ignition switch SW1 is a lighting switch.
In the liquid level measuring device for a vehicle, comprising a power supply circuit 6 connected to a battery B via an SW 2 and supplying power to the liquid level sensor 1, the delay circuit 4, the display 2 and the preset circuit 5, the lighting switch A timer 8 detects the opening of the ignition switch SW1 and cancels the delay operation of the delay circuit 4 for a predetermined time when SW2 is in the closed state and the power supply circuit 6 continues the power supply operation. Since the vehicle fluid level measuring device is characterized in that it is equipped with the following, this invention has the effect of being able to accurately determine the amount of fuel increase from moment to moment during refueling without time delay.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional vehicle fluid level measuring device, and FIG. 2 is a block diagram of a vehicle fluid level measuring device showing an embodiment of this invention. 1...Liquid level sensor, 2...Fuel indicator,
3...Amplifier, 4...Delay circuit, 5...Preset circuit, 6...Power supply circuit, 7...OR circuit,
8...Timer circuit, B...Battery, SW1...
Ignition switch, SW2...lighting switch.

Claims (1)

[Scope of utility model registration request] A liquid level sensor 1 that outputs an analog signal of a magnitude corresponding to the liquid level; a delay circuit 4 that averages the output signal of the liquid level sensor 1 with a large time constant and outputs the signal after a delay; A display 2 inputs the output signal of the circuit 4 and displays the liquid level according to the magnitude thereof, and a time constant of the delay circuit 4 decreases by detecting the turning on of the ignition switch SW1 or the lighting switch SW2. a preset circuit 5 for controlling the battery B, and a preset circuit 5 connected to the battery B via the ignition switch SW1 or the lighting switch SW2,
A power supply circuit 6 that supplies power to the liquid level sensor 1, the delay circuit 4, the display 2, and the preset circuit 5.
In the vehicle liquid level measuring device, when the lighting switch SW2 is in a closed state and the power supply circuit 6 is continuing power supply operation, an open state of the ignition switch SW1 is detected. A liquid level measuring device for a vehicle, characterized in that a timer circuit 8 is provided for canceling the delay operation of the delay circuit 4 after a predetermined period of time from its detection.