JPH10115249A - Method and apparatus for measuring instantaneous fuel consumption of a vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a driver from being given a feeling of physical disorder, by displaying a fact in the case of abnormality in instantaneous fuel consumption. SOLUTION: In an injection stop decision part 15, based on an injection signal for fuel injection, whether a stop of the fuel injection is provided or not is decided, in an instantaneous fuel injection calculating part 19, when a stop of the fuel injection is decided to be not provided, based on a travel distance and a fuel injection amount of a vehicle, its instantaneous fuel consumption is calculated, in a display part 41, a value of the calculated instantaneous fuel consumption of the vehicle is displayed. In a display processing part 31, when a stop of the fuel injection is decided to be not provided, a value of instantaneous fuel consumption of the vehicle is displayed in the display part 41, when a stop of the fuel, injection is decided to be provided, a fact that a value of instantaneous fuel consumption of the vehicle is in abnormality is displayed in the display part 41.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for measuring the instantaneous fuel consumption of a vehicle for measuring the instantaneous fuel consumption of a vehicle.

[0002]

2. Description of the Related Art A vehicle such as an automobile has a vehicle instantaneous fuel consumption measuring device which calculates a fuel injection amount for two seconds based on an injection signal for gasoline injection and an injector voltage. , The traveling distance for two seconds is calculated based on the input speed pulse.

The measuring device measures the instantaneous fuel consumption of the vehicle based on the fuel injection amount for two seconds and the traveling distance for two seconds, and displays the measured instantaneous fuel consumption in numerical values.

FIG. 8 shows a flowchart of a vehicle instantaneous fuel consumption measuring method realized by a conventional vehicle instantaneous fuel consumption measuring device of this type.

First, the above-described measuring device measures the instantaneous fuel consumption of the vehicle based on the fuel injection amount for 2 seconds and the traveling distance for 2 seconds (step S101), and stores the measured instantaneous fuel consumption data in a memory.

Next, the measuring device determines whether or not the instantaneous fuel consumption data ISFDATA stored in the memory is equal to or greater than a predetermined instantaneous fuel consumption, for example, 99.9 km / l (step S103).

The instantaneous fuel consumption data ISFDATA is 99.
If it is less than 9 km / l, a process of displaying the instantaneous fuel efficiency data at that time on the display unit is performed (step S105).

On the other hand, instantaneous fuel consumption data ISFDATA is
It may be 99.9 km / l or more. For example, when the instantaneous fuel consumption data ISFDATA becomes 100 km / l or more, or when an engine brake or the like is used depending on the state of the vehicle, gasoline injection may be temporarily stopped.

In such a state, when the instantaneous fuel consumption is measured, the traveling distance is calculated. However, since there is no gasoline injection, the value of the instantaneous fuel consumption becomes an infinite value. Further, the value of the instantaneous fuel consumption may be negative.

In such a case, 99.9 km / l is displayed as the instantaneous fuel consumption data ISFDATA. That is, the previous value is held without updating the display.

[0011]

However, since the previous value is displayed as the instantaneous fuel consumption data, an incorrect value different from the actual value is displayed. For this reason, there is a problem that the driver feels strange.

The present invention provides a method and an apparatus for measuring the instantaneous fuel consumption of a vehicle, which displays the instantaneous fuel consumption of the vehicle and, if the instantaneous fuel consumption is abnormal, displays the fact so that the driver does not feel uncomfortable. That is the task.

[0013]

The present invention employs the following means in order to solve the above-mentioned problems. The invention of claim 1 is
An injection stop determination unit that determines whether fuel injection is stopped based on an injection signal for fuel injection, and a travel distance and a fuel injection amount of the vehicle when the injection stop determination unit determines that fuel injection is not stopped. An instantaneous fuel efficiency calculating unit that calculates the instantaneous fuel efficiency of the vehicle based on the display unit that displays the value of the instantaneous fuel efficiency of the vehicle calculated by the instantaneous fuel efficiency calculating unit. A display processing unit for displaying the value of the instantaneous fuel consumption on the display unit, and displaying on the display unit that the value of the instantaneous fuel consumption of the vehicle is abnormal when it is determined that the fuel injection is stopped. And

According to the present invention, the injection stop determining unit determines whether or not fuel injection has been stopped based on the injection signal for fuel injection, and the instantaneous fuel consumption calculating unit determines that the fuel injection has not been stopped by the injection stop determining unit. When it is determined, the instantaneous fuel consumption of the vehicle is calculated based on the traveling distance and the fuel injection amount of the vehicle, the display unit displays the value of the instantaneous fuel consumption of the vehicle calculated by the instantaneous fuel consumption calculation unit, and the display processing unit When it is determined that the injection has not stopped, the value of the instantaneous fuel consumption of the vehicle is displayed on the display unit, and when it is determined that the fuel injection has stopped, the display unit indicates that the value of the instantaneous fuel consumption of the vehicle is abnormal. The driver can see that the value of the instantaneous fuel consumption of the vehicle is abnormal,
The driver will not feel uncomfortable.

According to a second aspect of the present invention, there is provided an injection amount negative value judging unit for judging whether or not the value of the instantaneous fuel consumption of the vehicle calculated by the instantaneous fuel consumption calculating unit is a negative value. When the value of the instantaneous fuel consumption of the vehicle is determined to be not a negative value, the value of the instantaneous fuel consumption of the vehicle is displayed on the display unit, and when the value of the instantaneous fuel consumption of the vehicle is determined to be a negative value, The gist is to display on the display unit that the value of the instantaneous fuel consumption is abnormal.

According to the present invention, the negative injection amount determining unit determines whether the value of the instantaneous fuel consumption of the vehicle calculated by the instantaneous fuel consumption calculating unit is a negative value, and the display processing unit determines whether the instantaneous fuel consumption of the vehicle is negative. When it is determined that the value of the fuel consumption is not a negative value, the value of the instantaneous fuel consumption of the vehicle is displayed on the display unit, and when the value of the instantaneous fuel consumption of the vehicle is determined to be a negative value, the value of the instantaneous fuel consumption of the vehicle is displayed. Since the display indicates that the vehicle is abnormal, the driver knows that the value of the instantaneous fuel consumption of the vehicle is abnormal, so that the driver does not feel uncomfortable.

According to a third aspect of the present invention, there is provided an injection amount excessive value judging unit for judging whether or not the value of the instantaneous fuel efficiency of the vehicle calculated by the instantaneous fuel efficiency calculating unit exceeds a predetermined excessive value, and the display processing unit. When the value of the instantaneous fuel consumption of the vehicle is determined to be equal to or less than the predetermined excessive value, the value of the instantaneous fuel consumption of the vehicle is displayed on the display unit, and it is determined that the value of the instantaneous fuel consumption of the vehicle exceeds the predetermined excessive value. The gist of the present invention is to display on the display unit that the value of the instantaneous fuel consumption of the vehicle is abnormal when it is performed.

According to the present invention, the excessive injection amount determining section determines whether or not the value of the instantaneous fuel consumption of the vehicle calculated by the instantaneous fuel consumption calculating section exceeds a predetermined excessive value. When it is determined that the value of the instantaneous fuel efficiency is equal to or less than the predetermined excessive value, the value of the instantaneous fuel efficiency of the vehicle is displayed on the display unit, and when it is determined that the value of the instantaneous fuel efficiency of the vehicle exceeds the predetermined excessive value, The fact that the value of the instantaneous fuel consumption is abnormal is displayed on the display unit, so that the driver can know that the value of the instantaneous fuel consumption is abnormal and does not give the driver a sense of discomfort.

According to a fourth aspect of the present invention, there is provided an injection stop determining step for determining whether or not fuel injection has been stopped based on an injection signal for fuel injection, and when it is determined that fuel injection has not been stopped, the travel distance of the vehicle. And an instantaneous fuel efficiency calculating step of calculating the instantaneous fuel efficiency of the vehicle based on the fuel injection amount, and a display step of displaying the calculated value of the instantaneous fuel efficiency of the vehicle on the display unit.
When it is determined that the fuel injection is not stopped, the value of the instantaneous fuel efficiency of the vehicle is displayed on the display unit, and when it is determined that the fuel injection is stopped, the fact that the value of the instantaneous fuel efficiency of the vehicle is abnormal is displayed. And a display processing step of causing the unit to display.

The invention according to claim 5 includes an injection amount negative value determining step of determining whether the calculated value of the instantaneous fuel consumption of the vehicle is a negative value, and the display processing step includes: The value of the instantaneous fuel efficiency of the vehicle is displayed on the display unit when it is determined that the value of is not a negative value, and the value of the instantaneous fuel efficiency of the vehicle is determined when the value of the instantaneous fuel efficiency of the vehicle is determined to be a negative value. The gist of the present invention is to cause the display unit to display a message indicating that there is an abnormality.

According to a sixth aspect of the present invention, there is provided an injection amount excessive value determining step for determining whether or not the calculated value of the instantaneous fuel consumption of the vehicle exceeds a predetermined excessive value. When it is determined that the value of the fuel efficiency is equal to or less than the predetermined excessive value, the value of the instantaneous fuel efficiency of the vehicle is displayed on the display unit, and when it is determined that the value of the instantaneous fuel efficiency of the vehicle exceeds the predetermined excessive value, the value of the vehicle is determined. The gist is to display on the display unit that the value of the instantaneous fuel consumption is abnormal.

[0022]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a method and apparatus for measuring instantaneous fuel consumption of a vehicle according to the present invention.

FIG. 1 is a block diagram showing the configuration of an embodiment of a vehicle instantaneous fuel consumption measuring apparatus according to the present invention. The vehicle instantaneous fuel consumption measuring device shown in FIG. 1 includes an instantaneous fuel consumption processing unit 11 and a display unit 41 connected to the instantaneous fuel consumption processing unit 11. The instantaneous fuel consumption processing unit 11 is provided in a central processing unit (CPU) (not shown) or the like.

The instantaneous fuel consumption processing section 11 performs processing of the instantaneous fuel consumption of the vehicle.
5, an injection stop flag section 17, an instantaneous fuel consumption calculation section 19, and a memory 21. Further, the instantaneous fuel consumption processing unit 11 includes an injection amount negative value determination unit 23, a negative value flag unit 25, an injection amount excessive value determination unit 27, an excessive value flag unit 29, and a display processing unit 31.

FIG. 2 shows a timing chart of the injection signal in the normal processing, and FIG. 3 shows a timing chart of the injection signal in the exception processing.

The counter 13, the injection stop judging unit 15, and the injection stop flag unit 17 detect the stop of the injection signal when the injection signal stops as a first exceptional process. As shown in FIG. 3, the counter 13 receives an injection signal for fuel injection (for example, gasoline injection), starts counting from the rising of the injection signal, and measures the time from the rising of the next injection signal to the falling of the next injection signal (a in FIG. 3). Part) is counted repeatedly within each gate (2 seconds).

The injection stop judging section 15 judges whether the injection signal has been stopped by judging whether or not the time counted by the counter 13 is equal to or longer than a predetermined time. The predetermined time value is, for example, 210 ms.

When it is determined that the time counted by the counter 13 is less than the predetermined time, the injection stop flag section 17 sets the injection stop flag to "0 (clear)" after the gate is completed.
Set to. When it is determined that the time counted by the counter 13 is equal to or longer than the predetermined time, the injection stop flag unit 17 sets the injection stop flag to “1 (set)” after the gate ends.

When the injection stop flag "0 (clear)" is input from the injection stop flag section 17, that is, when the injection signal is not stopped as shown in FIG. The traveling distance for 2 seconds is 2 based on the speed, the injector voltage and the speed pulse (vehicle speed pulse).
The instantaneous fuel consumption of the vehicle is calculated by dividing by the fuel injection amount per second. The memory 21 stores the instantaneous fuel consumption data calculated by the instantaneous fuel consumption calculation unit 19.

Injection amount negative value determination unit 23 and negative value flag unit 2
5 performs the second exception processing. Injection amount negative value determination unit 23
Determines whether the instantaneous fuel consumption data stored in the memory 21 is a negative value.

When it is determined that the instantaneous fuel consumption data stored in the memory 21 is a negative value, the negative value flag unit 25 sets the negative value flag to "1 (set)",
If it is determined that the instantaneous fuel consumption data stored in 1 is not a negative value, the negative value flag is set to “0 (clear)”.

The excessive injection value judging section 27 and the excessive value flag section 29 perform a third exception processing. When the negative value flag “0 (clear)” is input from the negative value flag unit 25, the injection amount excessive value determination unit 27 determines whether the instantaneous fuel consumption data stored in the memory 21 exceeds a predetermined excessive value. I do.

When it is determined that the instantaneous fuel consumption data stored in the memory 21 exceeds a predetermined excessive value, the excessive value flag section 29 sets the excessive value flag to "1 (set)", If the instantaneous fuel consumption data stored in the memory is determined to be equal to or smaller than the predetermined excessive value, the excessive value flag is set to “0 (clear)”.

The display processing section 31 includes an injection stop flag section 17
, The injection stop flag is “1 (set)”, or the negative value flag from the negative value flag unit 25 is “1 (set)”.
Alternatively, the excessive value flag from the excessive value flag unit 29 is set to “1”.
(Set) ", an error display of --- km
/ L is displayed.

The display processing section 31 includes an injection stop flag section 17
Is “0 (clear)”, the negative value flag from the negative value flag unit 25 is “0 (clear)”, and the excessive value flag from the excessive value flag unit 29 is “0 (clear)”. In the case of “0 (clear)”, the instantaneous fuel consumption data calculated by the instantaneous fuel consumption calculation unit 19 is numerically displayed as a normal display.

Next, a vehicle instantaneous fuel consumption measuring method realized by the vehicle instantaneous fuel consumption measuring device thus constructed is shown in FIG.
This will be described with reference to FIGS. FIG. 4 shows a flowchart of the vehicle instantaneous fuel consumption measurement method, FIGS. 5 and 6 show flowcharts of the interruption processing, and FIG. 7 shows a flowchart of the display processing.

First, a process when the injection signal is stopped will be described as a first exceptional process. The injection signal is, for example, when the engine brake is activated, or when the accelerator is depressed and the accelerator is suddenly turned off, or
It may stop when a gear change is made due to acceleration or the like.

In order to cope with such a case, the counter 13 receives the injection signal shown in FIG. 3 and performs an interruption process (step S11). In this interrupt processing, an interrupt is generated every 3 ms as shown in FIG. 5 from the rise of the injection signal (step S31).

The counter 13 increments the count value TAUOCN by one from the rising of the injection signal to the falling of the next injection signal every time a 3 ms interrupt occurs (step S33).

Then, when the next injection signal falls,
The injection stop determination unit 15 determines that the count value TAUOCN is H '.
It is determined whether or not 46 = 70 or more (step S
35). That is, the injection time a, b from the time of the rising of the injection signal to the time of the falling of the next injection signal is 210 m.
It is determined whether it is s or more.

Here, for 2 seconds of the gate B, 210 m
Each of the injection times a less than s and the injection stop time b of 210 ms or more are included.

Therefore, during the injection stop time b, the count value TAUOCN becomes H'46 or more, and the injection stop flag unit 17 sets the injection stop flag to "1 (set)".
(Step S37).

On the other hand, the timing chart of the injection signal in the normal processing shown in FIG. 2 includes only each injection time (t1, t2, t3, etc.) of less than 210 ms. Therefore, the injection pulse is interrupted (step S3).
9) Since the count value TAUOCN is less than 46,
The injection stop flag unit 17 sets the injection stop flag to "0 (clear)" (step S41).

Next, when the injection stop flag "0 (clear)" is input from the injection stop flag section 17, that is, when the injection signal as shown in FIG. The gate is started at intervals of 2 seconds from the rise of the first injection signal, and the Low width for 2 seconds (for example, t
1, t2, etc.) and the number of pulses.

Further, the instantaneous fuel consumption calculation section 19 refers to a table (not shown) that measures the injector voltage and stores the invalid injection time, finds the invalid injection time corresponding to the measured value, and converts the invalid pulse into the speed pulse. The running distance for 2 seconds is measured based on the distance.

Further, the instantaneous fuel consumption calculation unit 19 calculates the fuel injection amount for two seconds by the following equation using the values measured as described above.

{(T1 + t2 + t3) -T × 3 pulses}
X unit time injection amount x 6 (number of cylinders) where T is the invalid injection time per pulse, and the unit time injection amount is the specific injection capability of the injector.

Then, the instantaneous fuel consumption calculating section 19 calculates the instantaneous fuel consumption of the vehicle by dividing the calculated traveling distance for 2 seconds by the calculated fuel injection amount for 2 seconds (step S13). The instantaneous fuel consumption data calculated by the instantaneous fuel consumption calculation unit 19 is temporarily stored in the memory 21.

Next, as a second exceptional process, a process when the injection amount becomes a negative value will be described. For example, at the moment when the accelerator is depressed and the accelerator is suddenly turned off, the invalid injection time may be longer than the injection signal time.

In such a case, the injection amount negative value determination unit 23
Determines whether the instantaneous fuel consumption data stored in the memory 21 is a negative value (step S15).

When it is determined that the instantaneous fuel consumption data stored in the memory 21 is a negative value, the negative value flag unit 25 sets the negative value flag to "1 (set)" (step S17). . When it is determined that the instantaneous fuel consumption data stored in the memory 21 is not a negative value, the negative value flag unit 25 sets the negative value flag to “0 (clear)” (Step S19).

Next, a description will be given of a third exception processing when the accelerator is turned off during high-speed running. For example,
When the accelerator is turned off during high-speed running, the injection signal is not cut off, but the injection amount sharply decreases and the running distance for 2 seconds may not change significantly.

In such a case, the injection amount excessive value judging section 2
7, when the negative value flag "0 (clear)" is input from the negative value flag section 25, it is determined whether or not the instantaneous fuel consumption data ISFDATA stored in the memory 21 exceeds 50.0 km / l (step S21). ).

The excessive value flag section 29 indicates that the instantaneous fuel consumption data ISFDATA stored in the memory 21 is 50.0 km /
l, the over-value flag is set to “1”.
(Set) ”(step S23).

The excessive value flag section 29 indicates that the instantaneous fuel consumption data ISFDATA stored in the memory 21 is 50.0 km /
l, the over-value flag is set to "
0 (clear) "(step S25).

Next, the process of displaying the instantaneous fuel consumption data is performed according to the flowchart shown in FIG. 7 (step S2).
7). The display processing unit 31 determines whether the injection stop flag from the injection stop flag unit 17 is “1 (set)” (step S51).

When the injection stop flag from the injection stop flag section 17 is "1 (set)", the display processing section 31
Causes the display unit 41 to display "-km / l" as an abnormal display (step S53).

Next, when the injection stop flag from the injection stop flag section 17 is "0 (clear)", the display processing section 31 sets the negative value flag from the negative value flag section 25 to "1".
(Set) ”is determined (step S55).

When the negative value flag from the negative value flag section 25 is "1"
(Set) ", the display processing unit 31 causes the display unit 41 to display" -km / l "as an abnormal display (step S53).

Further, when the negative value flag from the negative value flag section 25 is "0 (clear)", the display processing section 31
Determines whether the excessive value flag from the excessive value flag unit 29 is "1 (set)" (step S5).
7).

When the excessive value flag from the excessive value flag section 29 is "1 (set)", the display processing section 31
Causes the display unit 41 to display "-km / l" as an abnormal display (step S53).

Further, when the excessive value flag from the excessive value flag section 29 is "0 (clear)", the display processing section 31 causes the display section 41 to display the instantaneous fuel consumption data as a normal display in a numerical value ( Step S59).

As described above, if the measured instantaneous fuel consumption is normal, the instantaneous fuel consumption is displayed. In addition, when the injection signal is stopped, when the invalid injection time is greater than the injection signal time, when the accelerator is turned off during high-speed running, etc., the above-described exception processing is performed, and an abnormal display is displayed on the display unit. Will not give.

The present invention is not limited to the above embodiment. In the embodiment, the predetermined time shown in FIG. 3 is set to 200 ms (or 138 ms), but the predetermined time may be another value.

In the embodiment, the excessive value is set at 50 km.
However, the excess value may be, for example, 70 km / l, or another value. Furthermore, in the embodiment, if the calculated instantaneous fuel consumption data is abnormal, −−km / l is displayed, but any other display may be used as long as the display indicates that it is abnormal.

Further, in the embodiment, each flag is set to "1 (set)" and "0 (clear)". For example, in contrast to this, each flag is set to "0 (set)" and "0 (set)".
1 (clear) ".

[0067]

According to the present invention, the injection stop judging section judges whether or not fuel injection has been stopped based on the injection signal, and the instantaneous fuel consumption calculating section has determined that the fuel injection has not been stopped. The instantaneous fuel consumption of the vehicle is calculated based on the distance and the fuel injection amount, the display unit displays the value of the instantaneous fuel consumption of the vehicle calculated by the instantaneous fuel consumption calculation unit, and the display processing unit determines that the fuel injection has been stopped. When this happens, the fact that the value of the instantaneous fuel consumption of the vehicle is abnormal is displayed on the display unit, so that the driver knows that the value of the instantaneous fuel consumption of the vehicle is abnormal, and does not give the driver an uncomfortable feeling.

The negative fuel injection value determining unit determines whether the value of the instantaneous fuel efficiency of the vehicle calculated by the instantaneous fuel efficiency calculating unit is a negative value, and the display processing unit determines whether the value of the instantaneous fuel efficiency of the vehicle is negative. When it is determined that the value is negative, the display unit indicates that the value of the instantaneous fuel consumption of the vehicle is abnormal, so that the driver knows that the value of the instantaneous fuel consumption of the vehicle is abnormal and gives the driver a sense of incongruity. Absent.

The excessive fuel injection value determining section determines whether the value of the instantaneous fuel consumption of the vehicle calculated by the instantaneous fuel consumption calculating section exceeds a predetermined excessive value. When it is determined that the value exceeds a predetermined excessive value, the fact that the value of the instantaneous fuel consumption of the vehicle is abnormal is displayed on the display unit,
The driver knows that the value of the instantaneous fuel consumption of the vehicle is abnormal, and does not give the driver a sense of incompatibility.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram showing an embodiment of a vehicle instantaneous fuel consumption measurement device of the present invention.

FIG. 2 is a timing chart of an injection signal in a normal process of the embodiment.

FIG. 3 is a timing chart of an injection signal in exception processing according to the embodiment.

FIG. 4 is a flowchart illustrating a method of measuring a vehicle instantaneous fuel consumption according to the embodiment;

FIG. 5 is a flowchart illustrating setting of an injection stop flag in an interrupt process according to the embodiment;

FIG. 6 is a flowchart illustrating clearing of an injection stop flag in an interrupt process according to the embodiment;

FIG. 7 is a flowchart illustrating a display process according to the embodiment;

FIG. 8 is a flowchart illustrating a conventional method for measuring instantaneous fuel consumption of a vehicle.

[Explanation of symbols]

 11 Instantaneous fuel consumption processing unit 13 Counter 15 Injection stop judgment unit 17 Injection stop flag unit 19 Instantaneous fuel consumption calculation unit 21 Memory 23 Injection amount negative value judgment unit 25 Negative value flag unit 27 Injection amount excessive value judgment unit 29 Excess value flag unit 31 Display Processing unit 41 Display unit

Claims (6)

[Claims] An injection stop determining unit that determines whether fuel injection is stopped based on an injection signal for fuel injection; and when the injection stop determining unit determines that fuel injection is not stopped, the vehicle travels. An instantaneous fuel efficiency calculating unit that calculates the instantaneous fuel efficiency of the vehicle based on the distance and the fuel injection amount; a display unit that displays the value of the instantaneous fuel efficiency of the vehicle calculated by the instantaneous fuel efficiency calculating unit; and determining that the fuel injection is not stopped. A display processing unit for displaying the value of the instantaneous fuel consumption of the vehicle on the display unit when the value is displayed, and displaying on the display unit that the value of the instantaneous fuel consumption of the vehicle is abnormal when it is determined that the fuel injection is stopped. , A vehicle instantaneous fuel efficiency measurement device. 2. An injection amount negative value judging unit for judging whether or not the value of the instantaneous fuel efficiency of the vehicle calculated by the instantaneous fuel efficiency calculating unit is a negative value, wherein the display processing unit includes: The value of the instantaneous fuel efficiency of the vehicle is displayed on the display unit when it is determined that the value of is not a negative value, and the value of the instantaneous fuel efficiency of the vehicle is determined when the value of the instantaneous fuel efficiency of the vehicle is determined to be a negative value. The vehicle instantaneous fuel consumption measurement device according to claim 1, wherein the display unit displays an indication that the vehicle is abnormal. 3. An excessive fuel injection amount judging unit for judging whether or not the value of the instantaneous fuel consumption of the vehicle calculated by the instantaneous fuel consumption calculating unit exceeds a predetermined excessive value. When it is determined that the value of the fuel efficiency is equal to or less than the predetermined excessive value, the value of the instantaneous fuel efficiency of the vehicle is displayed on the display unit, and when it is determined that the value of the instantaneous fuel efficiency of the vehicle exceeds the predetermined excessive value, the value of the vehicle is determined. The vehicle instant fuel consumption measurement device according to claim 1 or 2, wherein the display unit displays that the value of the instantaneous fuel consumption is abnormal. 4. An injection stop determining step of determining whether or not fuel injection is stopped based on an injection signal for fuel injection, and when it is determined that fuel injection is not stopped, the travel distance and the fuel injection amount of the vehicle are determined. Calculating the instantaneous fuel efficiency of the vehicle based on the calculated value of the instantaneous fuel efficiency of the vehicle, displaying the calculated instantaneous fuel efficiency value of the vehicle on the display unit, and determining the value of the instantaneous fuel efficiency of the vehicle when it is determined that the fuel injection is not stopped. Is displayed on the display unit, and when it is determined that the fuel injection is stopped, a display processing step of displaying on the display unit that the value of the instantaneous fuel consumption of the vehicle is abnormal is included. Instantaneous fuel consumption measurement method. 5. An injection amount negative value determination step of determining whether the calculated value of the instantaneous fuel consumption of the vehicle is a negative value, wherein the display processing step includes a step of determining whether the value of the instantaneous fuel consumption of the vehicle is negative. When it is determined that the value is not a value, the value of the instantaneous fuel consumption of the vehicle is displayed on the display unit, and when it is determined that the value of the instantaneous fuel consumption of the vehicle is a negative value, the value of the instantaneous fuel consumption of the vehicle is abnormal. The method for measuring instantaneous fuel consumption of a vehicle according to claim 4, wherein the method is displayed on the display unit. 6. An injection amount excess value determining step of determining whether the calculated value of the instantaneous fuel consumption of the vehicle exceeds a predetermined excessive value, wherein the display processing step includes a step of determining whether the value of the instantaneous fuel consumption of the vehicle is a predetermined value. The value of the instantaneous fuel consumption of the vehicle is displayed on the display unit when it is determined that the value of the instantaneous fuel consumption of the vehicle exceeds the predetermined excessive value. The vehicle instantaneous fuel consumption measurement method according to claim 4, wherein the fact that an abnormality is present is displayed on the display unit.