JPS6113929Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for displaying the distance traveled by a vehicle based on the remaining amount of fuel.

Conventionally, there are various types of mileage display devices based on the remaining amount of fuel, which calculate and display the mileage, fuel consumption, and remaining amount of fuel. The display format has changed from analog display using a pointer to digital display using digital display elements such as liquid crystals and light emitting diodes, such as segmented characters and bar graphs, to improve visibility.

However, the output of each detection device for mileage, fuel consumption, and remaining fuel constantly changes, and these data are calculated and displayed in an arithmetic memory circuit, so the display is constructed with a digital display element. In this case, if a high-speed output change with a small amplitude is input from the arithmetic and storage circuit, the display will flicker, resulting in a decrease in visibility, since the display follows quickly, unlike an analog display using a pointer. . Furthermore, if output changes of too large amplitude from the arithmetic storage circuit are displayed as they are, there is a drawback that it becomes difficult to determine which displayed data is correct.

The present invention was devised in view of the above-mentioned drawbacks, and its purpose is to provide an arithmetic storage circuit and a display for calculating the distance traveled based on the amount of remaining fuel based on the distance traveled, the amount of fuel consumed, and the remaining amount of fuel. By interposing a frequency selection filter section such as a digital filter between the two, a sudden change in the output of the arithmetic storage circuit is corrected to a slow change and inputted to the display, thereby preventing the display from flickering. At the same time, it is an object of the present invention to provide a drivable distance display device based on the remaining amount of fuel, which displays data close to actual data, is extremely accurate, and has good visibility.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a mileage detection device that detects the distance traveled per certain period of time, including a vehicle speed sensor 2, a waveform shaping circuit 3 that shapes the output of the vehicle speed sensor 2, and an output of the waveform shaping circuit 3. A frequency dividing circuit 4 that divides the frequency, a first counter 5 for detecting a constant traveling distance that counts and outputs the pulse output of the frequency dividing circuit 4, for example, every pulse number corresponding to 1 km traveling, the first counter 5 It consists of a second counter 6 for detecting a relatively long-distance constant traveling distance, which counts the output of and outputs an output every number of pulses corresponding to, for example, traveling 30 km.

7 is a fuel consumption measuring device, which outputs an injection pulse width signal having a pulse width that regulates the opening time of a fuel injection valve, that is, the injection amount in an electronically controlled fuel injection device (hereinafter referred to as "EGI") for an internal combustion engine. an EGI pulse width detection circuit 8 composed of a computer unit, etc., a reference clock generator 9 that generates clock pulses, and an AND circuit that receives input from both the output of the EGI pulse width detection circuit 8 and the output of the reference clock generator 9. 10. The total counter 11 receives signals from the second counter 6 every fixed travel distance and counts the pulse output from the AND circuit 10 during that period.

Reference numeral 12 denotes a remaining amount detection device that detects the remaining amount of fuel in the fuel tank, and a fuel gauge 13 that outputs an analog signal of current or voltage according to the remaining amount of fuel at minute intervals, for example, every 0.1 seconds. A reference clock generator 1 that generates clock pulses and also generates clock pulses every relatively long period of time, for example every two minutes.
4. An A-D converter 15 that converts the output of the fuel gauge 13 into a digital signal every minute clock pulse of the reference clock generator 14; a first storage circuit 17 that temporarily stores the output of the adder 16 for each minute clock pulse of the reference clock generator 14 and resets it for each relatively long clock pulse; ,
a second memory circuit 18 for temporarily storing the output of the first memory circuit 17 for each relatively long clock pulse of the reference clock generator 14; A constant divided by the clock pulse interval for each minute time, for example, 2 minutes divided by 0.1 seconds.
It consists of a constant divider 19 that divides the output of the second storage circuit 18 by 1200. Therefore, the remaining amount detecting device 12 outputs the average remaining amount at fixed time intervals.

20 is an arithmetic storage circuit that divides a constant corresponding to a certain travel distance counted by the second counter 6, for example 30km, by the output of the total counter 11, a constant divider 21, and the output of the constant divider 21 and the remaining amount. A multiplier 22 that multiplies the output of the constant divider 19 of the detection device 12, and a storage circuit 2 that temporarily stores the output of the multiplier 22 for each output of the second counter 6.
3. It consisted of a subtracter 24 that subtracts the output of the memory circuit 23 every time the first counter 5 outputs.

25 is a frequency selection filter unit such as a digital filter that corrects a sudden change in output from the arithmetic storage circuit 20 into a slow change, and adds the output of the subtracter 24 and the output of a first constant multiplier 28 to be described later. an adder 26, and a storage circuit 2 that temporarily stores the output of the adder 26 for each output of the first counter 5.
7. The first multiplier that multiplies the output of the memory circuit 27 by a constant.
A constant multiplier 28 and a second constant multiplier 29 that multiplies the output of the adder 26 by a constant constitute a first-order cyclic configuration.

Now, the input of the adder 26 is x, its output is y, the storage period of the storage circuit 27 is 1 km, and the first constant multiplier 2
The constant of 8 is K, and the constant of the second constant multiplier 29 is 1-
K and its output is Z, the operation of the frequency selection filter section 25 is expressed by the following equation. Note that n is the number of inputs, and is expressed as a number such as 0, 1, 2, or 3.

Z(n)=[x(n)+K・y(n-1)] (1-K) 30 is a display device that displays digital values using a liquid crystal, a light emitting diode, etc. using the output of the second constant multiplier 29. be.

Next, the operation will be explained.

The mileage detecting device 1 extracts, for example, a sine signal with a frequency corresponding to the rotation speed of the speedometer from the vehicle speed sensor 2, shapes it into a rectangular pulse by a waveform shaping circuit 3, and divides the frequency by a frequency dividing circuit 4. A signal is output every time the first counter 5 for detecting a constant traveling distance counts a certain number, for example, every pulse number corresponding to traveling 1 km, and the first counter 5 detects a relatively long constant traveling distance. A signal is output every time the second counter 6 counts a certain number, for example, every time the number of pulses corresponds to traveling 30 km.

The fuel consumption measuring device 7 receives an injection pulse width signal.
Taken out from the EGI pulse width detection circuit 8, Fig. 2a
The injection pulse width signal shown in FIG. 2 and the clock pulse shown in FIG. A total counter 11 counts the number of input clock pulses. Then, this total counter 11 is
A gate signal is input from the counter 6 for each fixed distance traveled, and a digital value corresponding to the fuel consumption amount for each fixed distance traveled is output based on the integrated value during that period.

The remaining amount detection device 12 takes out an analog signal of current or voltage according to the remaining amount of fuel from the remaining amount gauge 13, and converts it into a digital signal for each minute time clock pulse of the reference clock generator 14 using the A-D converter 15. The adder 16 and the first memory circuit 17 integrate the reference clock generator 14 at relatively long intervals, and the second memory circuit 18 integrates the reference clock generator 1.
A constant divider 19 divides the relatively long clock pulse interval of the reference clock generator 14 by a constant obtained by dividing the clock pulse interval of every minute time and outputs the result. do. That is, a digital value of the average remaining amount in the reference clock generator 14 over a relatively long period of time is output.

The arithmetic storage circuit 20 uses a constant divider 21 to
A fuel consumption rate is calculated by dividing a constant corresponding to a fixed distance counted by the second counter 6 by a digital value corresponding to the fuel consumption amount measured for each fixed distance outputted from the total counter 11. The multiplier 22 multiplies the fuel consumption rate calculated by the constant divider 21 by the digital value corresponding to the average remaining amount of fuel detected by the remaining amount detection device 12 to calculate the remaining fuel mileage. After that, the memory circuit 23
Each time the output signal from the second counter 6 is input, it clears the previously stored remaining mileage and latches and outputs a new calculation result, while also storing it in memory. The subtracter 24 is the memory circuit 23 described above.
The remaining mileage outputted from the first counter 5 is subtracted every fixed short distance outputted from the first counter 5. Therefore, the calculation storage circuit 20 calculates the remaining mileage for each comparatively long fixed distance output from the second counter 6, and calculates the remaining mileage while there is no output from the second counter 6. First counter 5 from remaining mileage
The output value is gradually decreased by subtracting a certain short distance for each output.

The frequency selection filter section 25 is an arithmetic storage circuit 20
The remaining mileage outputted from the adder 26, the memory circuit 27, and the first constant multiplier 28 performs a cyclic operation.

That is, the adder 26 adds the output value previously output from the calculation storage circuit 20 and calculated by the first constant multiplier 28 to the output value currently output from the calculation storage circuit 20. Thereafter, each time the output signal from the first counter is input, the storage circuit 27 clears the previously stored output value of the adder 26, latches and outputs the new calculation result, and holds it in memory. .

The first constant multiplier 28 multiplies the output value of the storage circuit 27 by a constant and outputs the result to the adder 26 . Furthermore, the second
A constant multiplier 29 multiplies the output value of the adder 26 by a constant and outputs the result.

The display 30 digitally displays the distance traveled based on the remaining amount of fuel, which has been adjusted to have a slow change by the frequency selection filter section 25.

Therefore, even if the vehicle speed, fuel consumption amount, and remaining amount of fuel change rapidly, the interposition of the frequency selection filter section 25 allows digital measurement of the mileage based on the remaining amount of fuel, which changes slowly. will be displayed.

Incidentally, the configuration in the above embodiment can be reduced in size by using a microcomputer except for each sensor section.

With the above configuration and operation, the following effects are achieved.

By interposing a frequency selection filter section between the display and the arithmetic storage circuit that calculates the mileage based on the remaining amount of fuel, the mileage, fuel consumption,
Even if the output of each detection device for the remaining amount of fuel changes and the arithmetic/memory circuit causes a sudden change in output, it can be corrected to a slow change and digitally displayed. Therefore, the arithmetic storage circuit prevents the display from flickering even if the output changes with a small amplitude and at high speed, and even if the output changes with a large amplitude, the actual data can be displayed without noise as much as possible. It is possible to provide a driving display device based on the remaining amount of fuel that is extremely accurate and has good visibility.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a mileage display device according to the remaining amount of fuel according to the present invention, and FIGS. 2a, 2b, and 2c are signal waveform diagrams for explaining the operation. DESCRIPTION OF SYMBOLS 1... Mileage detection device, 7... Fuel consumption measuring device, 12... Remaining amount detection device, 20... Arithmetic storage circuit, 25... Frequency selection filter section, 30...
…display.

Claims (1)

[Scope of utility model registration request] a constant mileage detection device that detects each fixed mileage of a short distance and a longer distance; and a fuel consumption amount that measures the amount of fuel consumed while the constant mileage of a long distance is detected by the constant mileage detection device. A measuring device, a remaining amount detection device that detects the remaining amount of fuel in the fuel tank, and the above-mentioned constant traveling distance, the above-mentioned fuel consumption amount, and the above-mentioned remaining fuel amount to calculate and output the traveling distance according to the remaining amount of fuel. and a frequency selection filter comprising an arithmetic storage circuit that holds data every fixed distance traveled, an addition/subtraction section and a multiplication section that calculates the output value of the arithmetic storage circuit, and a delay section that delays every short distance traveled. What is claimed is: 1. A mileage display device based on a remaining amount of fuel, characterized in that the device comprises: a display device that digitally displays a mileage based on a remaining amount of fuel based on the output of the frequency selection filter portion;