JPS603324Y2 - Instantaneous fuel consumption display device for vehicles - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an instantaneous fuel consumption display device for a vehicle, and particularly relates to an improvement of an instantaneous fuel consumption display device for a vehicle that is suitable for use in an automobile and displays the instantaneous fuel consumption of an engine installed in a vehicle. .

Conventionally, a fuel gauge has been widely used as a device for providing information regarding the fuel of a vehicle to a driver.

However, since this only displays the level of fuel remaining in the fuel tank, it has been difficult for the driver to know the instantaneous fuel consumption depending on the driving state of the vehicle.

On the other hand, in recent years, due to increasing awareness of energy conservation due to the depletion of petroleum resources, there has been a demand for instantaneous fuel consumption meters that can immediately display instantaneous fuel consumption according to the driving conditions of the vehicle.

Conventionally, such an instantaneous fuel consumption meter has been used, for example,
As shown in No. 8-5453, it has been proposed to calculate and display the instantaneous fuel consumption based on fuel consumption/time when the vehicle is stopped, and the applicant has also proposed to calculate and display the instantaneous fuel consumption based on fuel consumption/time when the vehicle is running. / proposed an instantaneous fuel consumption meter that calculates and displays the amount of fuel consumption, but the former only knows the amount of fuel consumed per unit time, and the amount of fuel consumed per unit of time is not what vehicle drivers are usually aware of. The latter has the disadvantage that the mileage cannot be easily known, while the latter allows the mileage per unit fuel consumption to be easily known, but when the mileage is O
When the vehicle is stopped, even if you drive properly,
Even when driving that consumes a lot of fuel, such as so-called idling, the worst instantaneous fuel consumption is displayed without distinction, and the problem is that the driver cannot be provided with guidelines for economical driving.

On the other hand, when the intake pipe negative pressure of the internal combustion engine is low, the amount of air-fuel mixture supplied is large, resulting in a large instantaneous fuel consumption.On the other hand, when the intake pipe negative pressure is high, the amount of air-fuel mixture supplied is small, so Taking advantage of the fact that instantaneous fuel consumption decreases, so-called economimeters are also widely used, which simply display instantaneous fuel consumption using an intake pipe negative pressure needle, but they do not contain any mileage information and are not accurate. It could not be called an instantaneous fuel consumption meter.

The present invention has been made to eliminate the above-mentioned conventional drawbacks, and an object of the present invention is to provide an instantaneous fuel consumption display device for a vehicle that can accurately display instantaneous fuel consumption regardless of the driving condition of the vehicle.

The present invention is an instantaneous fuel consumption display device for a vehicle that displays the instantaneous fuel consumption of the engine installed in the vehicle.When the vehicle is traveling at a speed greater than or equal to a predetermined value, the instantaneous fuel consumption is displayed based on travel distance/fuel consumption. This is a distant relative of the above purpose by displaying the instantaneous fuel consumption in terms of fuel consumption/time when the vehicle is stopped and the fuel consumption is less than a predetermined value.

Embodiments of the present invention will be described in detail below with reference to the drawings.

In this embodiment, the present invention is applied to a vehicle equipped with an engine equipped with an electronically controlled fuel injection device, and as shown in FIG. A gate circuit 12 outputs a signal to control each circuit every predetermined fuel injection amount (for example, 0.05 cc), an integration circuit 14 integrates the output of the gate circuit 12, and the output of the integration circuit 14 is used to determine the gate time. A comparator 16 compares the injection amount (0.05cc in this case) with a reference value A and generates an output when the output of the integrating circuit 14 exceeds the reference value A. A fuel injection amount measurement circuit 10 includes a latch/clear circuit 18 that outputs a latch signal or a clear signal for latching or clearing the fuel injection amount, and a fuel injection amount measuring circuit 10 that outputs a latch signal or a clear signal for latching or clearing the fuel injection amount. Opened by the output of the latch/clear circuit 18 for counting the output vehicle speed signal for a time corresponding to a predetermined fuel consumption (injection) amount (0.05 cc) and outputting the distance traveled during that time,
a gate circuit 22 closed by the comparator 16 output;
A counter 24 that counts the output of the gate circuit 22 and is cleared by the output of the latch/clear circuit 18;
A mileage measuring circuit 20 consisting of a latch circuit 26 that latches the output and a reference clock pulse of about 1.00 Hz are input to constantly measure the time required to consume a predetermined amount of fuel consumption (0.05 cc). , the said latch
a gate circuit 32 opened by the clear circuit 18 output and closed by the comparator 16 output;
a time measuring circuit 30 consisting of a counter 34 that counts the output and is cleared by the output of the latch/clear circuit 18; and a latch circuit 36 that latches the output of the counter 34 in response to a latch signal of the output of the latch/clear circuit 18; , the predetermined fuel consumption amount (0,0
5cc) (corresponds to vehicle speed)
a comparison circuit 40 that compares the reference value B with a reference value B and outputs a switching signal depending on the magnitude relationship between the reference value B and the mileage per predetermined fuel consumption; , When the vehicle is traveling at a travel distance per predetermined fuel consumption amount, that is, the vehicle speed is a predetermined value or more, the instantaneous fuel consumption is calculated and output based on the travel distance per predetermined fuel consumption amount (0.05 cc) of the output of the latch circuit 26. On the other hand, when the vehicle is stopped when the traveling distance per predetermined fuel consumption amount, that is, the vehicle speed is less than a predetermined value, the fuel consumption amount/ It has a display drive circuit 42 that calculates and outputs instantaneous fuel consumption according to time, and has three green, yellow, and red lamps, and according to the output of the display drive circuit 42, for example, the traveling distance/fuel consumption is 15 m. // or more, or the green lamp lights up when the fuel consumption/time is less than 30cc/min, and the mileage/fuel consumption is 5-15krr1/l, or , fuel consumption/hour is 30~90cc/
The yellow lamp lights up when the mileage/fuel consumption is less than 5 krn/l, or
The display section 44 has a red lamp that lights up when the fuel consumption amount/time is 90 cc/minute or more.

The predetermined fuel consumption amount (0.05cc) in the fuel injection amount measurement circuit 10 for determining the measurement interval in the mileage measurement circuit 20 and the time measurement circuit 30 is displayed on the display section 44.
It is determined according to the display update cycle of instantaneous fuel consumption.

For example, if the fuel efficiency when a vehicle is traveling at 60 b/h on a steady road is 60 cc/min, then the fuel will be 0.0 m at 0.0 m.
．． Since 0.5 cc has been consumed, the display update cycle on the display unit 44 during this 60 b/h constant speed running is 0.05 seconds + Tc (Tc is the latch/clear time).

The action will be explained below.

The fuel injection amount measuring circuit 10 integrates the fuel injection signal T output from the electronically controlled fuel injection device to the fuel injection valve disposed in the engine's intake manifold, for example, and determines the fuel injection amount as 0.
A gate open signal, a gate close signal, a latch signal, a clear signal, etc. are output to the mileage measuring circuit 20 and the time measuring circuit 30 every 0.5 cc.

In the mileage measuring circuit 20, a counter 24 counts a vehicle speed signal corresponding to a fuel injection amount of 0.05 cc according to the output of the fuel injection amount measuring circuit 10, and the latch circuit 26 holds the counted vehicle speed signal.

On the other hand, the time measurement circuit 30 counts the reference clock pulses with a counter 34 according to the output of the fuel injection amount measurement circuit 10, and holds the time required for the fuel injection amount of 0.05 cc with a latch circuit 36.

The comparison circuit 40 compares the traveling distance per unit fuel injection amount output from the latch circuit 26 with a reference value B, and outputs a switching signal to the display drive circuit 42 in accordance with the comparison result.

The display drive circuit 42 determines the running speed (reference value B) per 0.05 cc of fuel injection amount according to the output of the comparison circuit 40.
When the vehicle speed is greater than the predetermined value, that is, when the vehicle is traveling at a speed equal to or higher than a predetermined value, the display section 44 is driven to display the instantaneous fuel consumption in terms of travel distance/fuel consumption.

Specifically, if the mileage/fuel consumption is 15 km/l or more, the green lamp will be turned on, if it is 5 to 15 m//, the yellow lamp will be turned on, and if the driving distance is 5 km/l or less, the red lamp will be turned on. Turn on the lamp.

On the other hand, when the travel distance per predetermined fuel consumption (0.05 cc) is smaller than the reference value B, that is, when the vehicle is stopped or running at a slow speed, the vehicle speed is less than the predetermined value, the instantaneous fuel consumption is determined by the fuel consumption/time. The display section 44 is driven to display the following.

Specifically, if the fuel consumption/time is 30 cc/min or less, a green lamp is lit, if it is 30 to 90 cc/min, a yellow lamp is lit, and if it is 90 cc/min or more, a red lamp is lit. Turn on the lamp.

In this example, since the traveling distance or time is calculated as the traveling distance or time corresponding to a predetermined fuel consumption amount (0.05cc), if the instantaneous fuel consumption is poor, the instantaneous fuel consumption is calculated. Since the time interval between these changes and the display update period are also shortened, the driver can quickly express his/her intention to improve fuel efficiency.

Note that the method of calculating mileage/fuel consumption or fuel consumption/time is not limited to the above embodiments; for example, mileage/fuel consumption or fuel consumption/time may be calculated at predetermined intervals. It is possible.

In the above embodiment, the display section 44 was composed of three lamps, one for green, one for yellow, and one for facial color, and was designed to display the instantaneous fuel consumption to the driver. However, the structure of the display section is as follows. The present invention is not limited to this, and it is also possible to display the instantaneous fuel consumption numerically using a digital display.

Of course, in this case, when the vehicle is running and when the vehicle is stopped,
The unit display is, for example, km/lz cc/min.
You need to switch like this.

In the above embodiment, the present invention is applied to a vehicle having an internal combustion engine equipped with an electronically controlled fuel injection device.Although the fuel consumption amount is calculated from the fuel injection signal T, the scope of application of the present invention is not limited to this. It is obvious that the present invention is not limited to this, and can be similarly applied to a vehicle equipped with an internal combustion engine equipped with a carburetor by separately providing a fuel flow meter for measuring the fuel flow rate.

As explained above, according to the present invention, it is possible to accurately display instantaneous fuel consumption regardless of the driving condition of the vehicle, and therefore it is possible to accurately indicate to the driver an intention to improve fuel efficiency. Has excellent effects.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of an instantaneous fuel consumption display device for a vehicle according to the present invention. DESCRIPTION OF SYMBOLS 10...Fuel injection amount measurement circuit, 12...Gate circuit, 14...Integrator circuit, 16...Comparator, 18...
Latch/clear circuit, 20... mileage measurement circuit, 2
2... Gate circuit, 24... Counter, 26...
Latch circuit, 30... Time measurement circuit, 32... Gate circuit, 34... Counter, 36... Latch circuit,
40... Comparison circuit, 42... Display drive circuit, 44.
...Display section.

Claims (1)

[Scope of utility model registration request] In a vehicle instantaneous fuel consumption display device that displays the instantaneous fuel consumption of the engine installed in a vehicle, when the vehicle is traveling at a speed greater than or equal to a predetermined value, the instantaneous fuel consumption is displayed based on travel distance/fuel consumption, and when the vehicle speed is less than a predetermined value. An instantaneous fuel consumption display device for a vehicle, characterized in that when the vehicle is stopped, instantaneous fuel consumption is displayed in terms of fuel consumption/time.