JP2002227710A - Method for measuring fuel consumption of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform measurement of fuel consumption of a total of production vehicles. SOLUTION: When fuel consumption of a hybrid vehicle 1 is measured, data of a factor to exert an influence on fuel consumption outputted by a plurality of control units 2a, 3a, 4a, 5a, 6a, 7a, and 8a is measured and individual evaluation is effected on each factor to measure fuel consumption.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of measuring fuel efficiency of a vehicle used for measuring fuel efficiency of a vehicle, and more particularly to a method of measuring fuel efficiency of a hybrid vehicle having an internal combustion engine and an electric motor. The present invention relates to a method of measuring fuel consumption of a vehicle.

[0002]

2. Description of the Related Art Conventionally, the fuel efficiency of a vehicle is measured by using a fuel efficiency meter or by using an exhaust gas component analyzer. In each case, a special vehicle for measurement is used. It is supposed to do.

That is, when a fuel economy meter is used, the fuel economy meter is installed so that the fuel system of the special measurement vehicle is once bypassed by the fuel gauge, and then the vehicle travels on a predetermined course. The distance is obtained, and at the time of measurement, the vehicle travels in a predetermined traveling pattern to perform the measurement.

On the other hand, when an exhaust gas component analyzer is used, the vehicle travels on a chassis dynamometer on which the exhaust gas component analyzer is installed to obtain a travel distance. At the time of measurement, a fuel economy meter is used. In the same way as in the case of running with the determined running pattern, measurement is performed,
After this measurement, a correction value is added to the measurement result.

[0005] In particular, in a hybrid vehicle, the engine output (energy) can be stored in the main battery. Therefore, at the time of measurement, the state in which the energy transitions to the main battery is recognized, and this is added to the measurement result. It is essential to make corrections.

[0006]

However, conventionally, both the method using a fuel consumption meter and the method using an exhaust gas component analyzer require a lot of man-hours to set up measuring instruments. Therefore, there is a problem that the fuel consumption cannot be measured for all the production vehicles, and when high measurement accuracy is not required, the measurement cost is increased by the use of the measuring device.

In both cases of using a fuel economy meter and using an exhaust gas component analyzer, it is necessary to travel on a course whose distance is known. In particular, an exhaust gas component analyzer is used. In this case, there is a problem that the measurement can be performed only in a test room having a special facility such as a chassis dynamometer, that is, the measurement can be performed only in a predetermined place.

Further, in both the case of using the fuel economy meter and the case of using the exhaust gas component analyzer, it is necessary to drive the vehicle in a predetermined complicated running pattern at the time of measurement. There was a problem that it took time.

Further, since the traveling pattern is instructed at the target arrival speed, it is not easy to adjust the speed, and there is a possibility that the amount of depression of the accelerator may vary in the process up to the target arrival speed, and the fuel injection amount may be reduced. Affected (particularly in hybrid vehicles where engine / motor switching may be performed depending on the accelerator opening), and in addition, there is almost no regulation of the target arrival speed, There is a problem that the measurement results are adversely affected by variations in the accelerator pedal depression amount of each driver, and solving these problems has been a conventional problem.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and can measure the fuel consumption of all production vehicles without requiring special facilities and places. It is an object of the present invention to provide a vehicle fuel efficiency measurement method capable of realizing reduction and shortening of measurement time, and also capable of realizing improvement of fuel efficiency measurement accuracy of a hybrid vehicle.

[0011]

According to a first aspect of the present invention, there is provided a method for measuring fuel efficiency of a vehicle, which measures fuel efficiency of a vehicle when measuring the fuel efficiency of the vehicle. Data, for example, measuring the state of the drive system of the vehicle, the state of the drive transmission system, the vehicle friction and the road surface weather state, and individually evaluating each factor to measure fuel consumption The configuration of the vehicle fuel efficiency measurement method is a means for solving the above-described conventional problem.

Here, in the case where the vehicle is a hybrid vehicle, when the state of the drive system is adopted as the data of the factors affecting the fuel efficiency outputted by the control unit, the engine drive, the motor drive, and both drive the motor drive. Although there are three patterns, accurate measurement and evaluation can be performed more simply by measuring two patterns, that is, driving the engine alone and driving the motor alone.

According to a second aspect of the present invention, there is provided a fuel efficiency measuring method for a vehicle, wherein the fuel efficiency is measured from a fuel injection pulse of data output by a plurality of control units mounted on the vehicle when measuring the fuel efficiency of the vehicle. The fuel consumption is calculated based on the injection amount and the travel distance obtained from the vehicle speed sensor. The method for measuring the fuel consumption of the vehicle is a means for solving the above-mentioned conventional problems.

In this case, the fuel injection amount is obtained by the following calculation after obtaining the injector ON signal (fuel injection pulse) per cylinder of the engine of the vehicle.

Fuel injection amount (cc / 100 ms) = injector characteristic value {(cc / min) / 60} × the number of cylinders × fuel injection pulse width {(10 μs
/ 100ms) / 100000}

On the other hand, the traveling distance is obtained from the formula of distance (m) = speed (m / sec) × time (sec) based on the time data and the speed obtained from the vehicle speed sensor of the vehicle control unit. Obtain the accumulated data of injection amount and mileage, and calculate mileage (km) / fuel injection amount (l)
Calculate the fuel efficiency (km / l) from the formula.

According to a third aspect of the present invention, there is provided a vehicle fuel efficiency measuring method for measuring a fuel efficiency of a hybrid vehicle.
At the time of calculating the fuel efficiency based on the fuel injection amount obtained from the fuel injection pulse of the data output by the plurality of control units mounted on the vehicle and the travel distance obtained from the vehicle speed sensor, the control unit of the vehicle It is characterized in that the obtained current balance value to the main battery is reflected as a correction value to the fuel injection amount, and the configuration of the vehicle fuel efficiency measurement method is a means for solving the above-mentioned conventional problems. .

In the method for measuring fuel efficiency of a vehicle according to the third aspect, if the current balance value to the main battery is positive, it indicates that the engine has been started to charge the battery, so that it is used for traveling. Actual fuel economy
(km / l) is obtained from the formula of travel distance (km) / [fuel injection amount-fuel injection amount used for charging] (l).

If the value of the current balance to the main battery is negative, it indicates that the battery energy has been used for driving. Therefore, the actual fuel consumption (km / l) used for traveling is: It is obtained from the formula of traveling distance (km) / [fuel injection amount + fuel injection amount for electric energy used for driving] (l).

The amount of fuel injection used for charging (l)
And fuel injection amount for electric energy used for driving (l)
Is determined based on the relationship between the power generation and the fuel injection amount acquired in advance.

According to a fourth aspect of the present invention, there is provided a method of measuring fuel consumption of a vehicle, comprising: a vehicle diagnostic connector connected to a plurality of control units mounted on the vehicle; and a communication control for controlling communication with the vehicle through the vehicle diagnostic connector. Machine, a central processing unit that performs arithmetic processing of data from each control unit of the vehicle obtained via the vehicle diagnostic connector, and a traveling data analysis device including a storage unit that stores data. The fuel consumption is measured.

[0022]

According to the method for measuring fuel efficiency of a vehicle according to the first aspect of the present invention, since the above-described configuration is employed, it is almost unnecessary to set measuring instruments, and as a result, measurement cost can be reduced and total production can be achieved. It is possible to measure the fuel efficiency of the vehicle, and accordingly, it is possible to respond to a problem item related to the fuel efficiency of each vehicle before shipment.

Further, data is collected by dividing into various factors,
Since we make individual evaluations based on this,
It is possible to determine the cause of poor fuel economy, which will be very useful for future analysis and countermeasures.Because data immediately after production can be collected, for example, after the endurance test, If the data is collected and examined, it is possible to analyze the state of deterioration related to fuel efficiency.

The method for measuring fuel efficiency of a vehicle according to the second aspect of the present invention is configured as described above, so that the number of steps for installing a measuring device such as a fuel efficiency meter is greatly reduced, and measurement is performed without being restricted by a place. The fuel consumption can be easily measured.

Since the method of measuring fuel consumption of a vehicle according to the third aspect of the present invention has the above-described structure, it is possible to connect a special device such as a current integrator without connecting a special device such as a conventional fuel consumption precision measurement. The current balance value to the main battery can be used as a correction value.

The vehicle fuel efficiency measuring method according to the fourth aspect of the present invention has the above-described configuration, so that the number of measuring steps and the measuring time can be reduced, and special equipment and a special place are required. This makes it possible to measure the fuel efficiency of all the production vehicles without any problem.

[0027]

According to the method of measuring fuel consumption of a vehicle according to the first aspect of the present invention, since the above-described configuration is employed, the measurement cost can be reduced and the fuel consumption of all the production vehicles can be measured. Yes, as a result, before shipping the vehicle, it is possible to deal with a defect item relating to fuel efficiency of each vehicle.

Further, according to the method for measuring fuel efficiency of a vehicle according to the first aspect of the present invention, it is possible to determine the cause of poor fuel efficiency, and to play a great role in future analysis and countermeasures. This is a very excellent effect that it is possible to analyze the state of deterioration related to.

According to the method of measuring fuel consumption of a vehicle according to the second aspect of the present invention, since the above-described configuration is employed, the number of steps for installing a measuring device such as a fuel consumption meter can be greatly reduced, and the location of the vehicle can be reduced. The measurement can be performed without any restriction, and as a result, a very excellent effect that the fuel consumption measurement can be performed extremely easily can be obtained.

The method for measuring fuel efficiency of a vehicle according to the third aspect of the present invention has the above-described structure. Therefore, the current balance value to the main battery can be used as a correction value without connecting a special device such as a current integrator. It has a very good effect that it can be used.

Since the method for measuring fuel efficiency of a vehicle according to the fourth aspect of the present invention has the above-described configuration, it is possible to reduce the number of measurement steps and the measurement time, and also to provide special equipment. In addition, a very excellent effect that the fuel consumption of all the production vehicles can be measured without requiring a place is provided.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 is a diagram for explaining an embodiment of a vehicle fuel efficiency measuring method according to claims 1 and 4 of the present invention. In this embodiment, a case where the vehicle is a hybrid vehicle is shown.

As shown in FIG. 1, the hybrid vehicle 1 includes an engine 2, a CVT 3, a first motor 4 for generating a driving force, a second motor 5 for driving the stopped engine 2, and a CVT. A third motor 6 for generating hydraulic pressure,
Hybrid control management system 7
And a main battery 8 for storing energy generated by the engine 2 as electric power.
T3, motors 4 to 6, hybrid control management system 7 and main battery 8 are connected to each other to form control unit 2a, 3a, 4a, 5a, 6a, 7a, 8
a is provided in association with each.

A traveling data analysis device 10 for measuring and analyzing the traveling data of the hybrid vehicle 1 includes a vehicle diagnostic connector 11 connected to the in-vehicle network 9 of the hybrid vehicle 1 and a hybrid vehicle made through the vehicle diagnostic connector 11. Communication controller 12 that controls communication with 1
And each control unit 2a, 3a, 4 of the hybrid vehicle 1 obtained through the vehicle diagnostic connector 11.
a, 5a, 6a, 7a, 8a, a central processing unit 13 for performing arithmetic processing of data, a storage unit 14 for storing a plurality of data, and a display unit for displaying traveling instructions and acquired data to an inspector. 15 and a keyboard 16 for inputting commands
And a voice output unit 17 for transmitting a vehicle state or audibly recognizing a driving instruction, and all kinds of vehicle state data are acquired through the vehicle diagnostic connector 11.

In this case, the status data on the engine 2 is obtained from the engine control unit 2a, and the status data on the first motor 4 for generating driving force is the first data.
The status data on the CVT 3 obtained from the motor control unit 4a is obtained from the CVT control unit 3a.

The state data relating to the third motor 6 for generating CVT oil pressure is stored in the third motor control unit 6.
a, the status data on the second motor 5 is obtained from the second motor control unit 5a, the status data on the main battery 8 is obtained from the battery control unit 8a, and the hybrid control management system 7 is integrally controlled. The state data is obtained from the hybrid control unit 7a, and the balance of the power to the main battery 8 is performed at any time according to the running state, the remaining battery level, and the state of various systems. .

In the hybrid vehicle 1 as described above, each of the control units 2a, 3a, 4a, 5a,
When the state of the drive system is adopted as the data of the factors that affect the fuel efficiency output by the motors 6a, 7a, and 8a, three patterns of engine drive, motor drive, and both drive are assumed. If only two patterns of single drive of one motor 4 are measured, accurate measurement and evaluation can be performed more easily. Table 1 shows a list of factors of each driving pattern from the state of the driving system.

[0039]

[Table 1]

That is, in this fuel efficiency measurement method, when measuring the fuel efficiency of the hybrid vehicle 1, as shown in Table 1, a plurality of control units 2 mounted on the vehicle are used.
a, 3a, 4a, 5a, 6a, 7a, 8a, the state of the drive system of the hybrid vehicle 1 that affects the fuel efficiency output is measured, and each factor is individually evaluated to measure the fuel efficiency. There is almost no need to perform setting of the measuring device. As a result, the measurement cost can be reduced and the fuel consumption of all the production vehicles can be measured.

Further, with this, it is possible to cope with the problem items related to the fuel efficiency of each vehicle before shipment. In addition, in this fuel efficiency measurement method, the data is divided into various factors as described above. And collectively evaluate them based on this, so that it is possible to determine the cause of poor fuel economy, which will be useful for future analysis and countermeasures, and to collect data immediately after production. Get
For example, after the endurance running test, if the data of the above factors is collected from the experimental vehicle and examined, it is possible to analyze the deterioration state related to fuel efficiency.

Next, a method of obtaining fuel efficiency by the vehicle fuel efficiency measurement method according to the second aspect of the present invention will be described. In this vehicle fuel efficiency measurement method, when the fuel efficiency of the hybrid vehicle 1 is measured, the hybrid vehicle 1 A plurality of mounted control units 2a, 3a, 4a, 5a, 6a,
The fuel consumption calculation is performed based on the fuel injection amount obtained from the fuel injection pulse of the data output by 7a and 8a and the travel distance obtained from the vehicle speed sensor,
At this time, the fuel injection amount is obtained by acquiring an injector-on signal (fuel injection pulse) per cylinder of the engine 2 of the hybrid vehicle 1 and calculating the fuel injection amount (cc / 100 ms) = injector characteristic value {(cc / min) / 60} × the number of cylinders × fuel injection pulse width {(10 μs / 100ms) / 100000}, while the travel distance is calculated based on the time data and the speed obtained from the vehicle speed sensor of the vehicle control unit. m) =
Speed (m / sec) × time (sec) is obtained from the formula, these fuel injection amount and integrated data of the mileage is acquired,
The fuel consumption (km / l) is obtained from the formula of travel distance (km) / fuel injection amount (l).

Therefore, according to this method of measuring fuel consumption of a vehicle, the number of steps for installing a measuring device such as a fuel consumption meter can be greatly reduced, and the measurement can be performed without being restricted by a place, so that the fuel consumption can be easily measured. It will be.

Further, a method of determining fuel efficiency by the vehicle fuel efficiency measurement method according to claim 3 of the present invention will be described. In this vehicle fuel efficiency measurement method, when measuring the fuel efficiency of the hybrid vehicle 1, the vehicle is mounted on the hybrid vehicle 1. Control units 2a, 3a, 4a, 5a, 6
a, 7a and 8a, control units 2a and 3a of hybrid vehicle 1 at the time of calculating fuel efficiency based on a fuel injection amount obtained from a fuel injection pulse and a travel distance obtained from a vehicle speed sensor. , 4
The current balance value to the main battery 8 obtained from a, 5a, 6a, 7a, 8a is reflected as a correction value in the fuel injection amount. In this vehicle fuel efficiency measurement method, the current balance to the main battery 8 is measured. If the value is positive, it indicates that the engine 2 has been started to charge the battery 8, so the actual fuel consumption (km / l) used for traveling is calculated by the following formula: mileage (km) / [fuel Injection amount-Fuel injection amount used for charging] (l). If the current balance value to the main battery is negative, it indicates that battery energy was used for driving. Therefore, the actual fuel consumption (km / l) used for traveling is calculated from the formula: traveling distance (km) / [fuel injection amount + fuel injection amount for electric energy used for driving] (l).

At this time, the fuel injection amount used for charging
(l) and fuel injection amount for electric energy used for driving
(l) is determined based on the relationship between the power generation and the fuel injection amount acquired in advance.

Therefore, in this method of measuring fuel consumption of a vehicle, the current balance value to the main battery is used as a correction value, similarly to the conventional fuel consumption precision measurement, without connecting a special device such as a current integrator. You will get.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a system when a vehicle fuel efficiency measurement method according to one embodiment of the present invention is used for a hybrid vehicle.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Hybrid vehicle 2a, 3a, 4a, 5a, 6a, 7a, 8a Control unit 8 Main battery 10 Running data analysis device 11 Vehicle diagnostic connector 12 Communication controller 13 Central processing unit 14 Storage unit

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // G01M 15/00 G01M 15/00 Z 17/007 17/00 Z F term (Reference) 2G087 BB01 BB25 CC01 CC28 CC34 FF08 3G084 BA13 DA04 DA13 DA21 EB02 EB06 FA03 FA05 FA13 5H115 PA12 PC06 PG04 PI16 PU25 QN02 RE05 SE05 TB01 TO04

Claims (4)

[Claims] When measuring fuel efficiency of a vehicle, data of factors affecting fuel efficiency output by a plurality of control units mounted on the vehicle is measured, and each factor is individually evaluated to measure fuel efficiency. And a fuel efficiency measurement method for a vehicle. 2. A method for measuring fuel efficiency of a vehicle based on a fuel injection amount obtained from a fuel injection pulse and a travel distance obtained from a vehicle speed sensor in data output by a plurality of control units mounted on the vehicle. A fuel efficiency measurement method for a vehicle, comprising: 3. When measuring fuel efficiency of a hybrid vehicle, a fuel injection amount obtained from a fuel injection pulse and a travel distance obtained from a vehicle speed sensor in data output by a plurality of control units mounted on the vehicle are used. A fuel consumption measurement method for a vehicle, comprising: reflecting a current balance value to a main battery obtained from a control unit of the vehicle as a correction value in a fuel injection amount at a time of performing a fuel consumption calculation based on the calculation. 4. A vehicle diagnostic connector for connecting to a plurality of control units mounted on the vehicle, a communication controller for controlling communication with the vehicle through the vehicle diagnostic connector, and a vehicle acquired via the vehicle diagnostic connector 4. The fuel consumption of a vehicle is measured using a central processing unit that performs a calculation process of data from each control unit and a travel data analysis device that includes a storage unit that stores data. The method for measuring fuel efficiency of a vehicle as described.