JP4963095B2 - Fuel efficient driving evaluation system - Google Patents

Description

  The present invention, for example, in a commercial vehicle such as a truck or a bus, evaluates the driving state in order to perform the fuel-saving driving, and issues a fuel-saving driving of the vehicle to give a recommendation instruction (advice) to the driver as necessary. Regarding the evaluation system.

  In order to perform fuel-saving driving as much as possible in the operation of the vehicle, conventionally, the driving state is evaluated, and if necessary, the driver is instructed to advise the driving method (advice: for example, speed change is recommended) In addition, various fuel-saving driving evaluation systems have been proposed that provide advice such as urging to accelerate slowly).

For example, a technology related to a fuel-saving driving evaluation system has been proposed that can only display advice (advice) and voice warning for acceleration / deceleration and gear shifting operations, and can improve the accuracy of driving state evaluation ( Patent Document 1).
In addition, technologies related to fuel-saving driving evaluation systems that have been evaluated as appropriate, including whether they are traveling on general roads or traveling on high-speed roads, or that have been determined as climbing or descending and excluded from the scope of general evaluation systems, have also been proposed. (See Patent Document 2).
Also, a technology related to a fuel-saving driving evaluation system that proposes fuel-saving driving by performing driving evaluation after classifying the above technologies into general roads, high-speed roads, climbing slopes, and descending slopes has been proposed. (See Patent Document 3).

In these fuel-saving driving evaluation systems, the accelerator opening and the engine speed are used as parameters for evaluation of fuel-saving driving.
Here, the evaluation accuracy in the area of the uphill traveling is inferior. For example, there is a possibility that an appropriate advice display may not be performed, such as an instruction for urging upshifting when there is no surplus torque during the uphill.
Therefore, in the above-described prior art (Patent Documents 1 to 3), there is a method of performing an uphill traveling determination and excluding evaluation in an uphill traveling area, or performing an evaluation by classifying a traveling state. It has been taken.

However, in the above-described conventional techniques (Patent Documents 1 to 3) that perform fuel-saving driving evaluation using the accelerator opening and the engine speed as parameters, in order to prevent inappropriate advice from being displayed during climbing, Such control, that is, whether or not the vehicle is traveling uphill is determined, and control such as excluding the case of traveling uphill from the evaluation is necessary. Since such control is executed, the configuration may be complicated.
JP 2006-76415 A JP 2006-77664 A JP 2006-88820 A

  The present invention has been proposed in view of the problems of the prior art, and provides a fuel-saving driving evaluation system that can evaluate fuel-saving driving by simpler control or procedure without requiring an uphill traveling determination means. It is an object.

That is, the present invention is proposed based on the results of various studies on the above-described problem related to the fuel-saving driving evaluation system.
The inventor pays attention to the fact that changes in accelerator opening or engine speed can be related to changes in vehicle acceleration, and uses the vehicle acceleration as a control parameter to solve the above-described problems. .

  According to the present invention, there is provided a record display means (7) for calculating the acceleration (A) of the vehicle (1), calculating the weighting of the accelerator opening and the engine speed, and displaying the recommendation to the driver. In the fuel efficiency driving evaluation system, an acceleration judgment value for making a recommendation display judgment is inputted in advance to the record display means (7), the acceleration is compared with the acceleration judgment value, and it is in the recommendation display area. When it is determined, it has a function of performing a weighting calculation between the accelerator opening and the engine speed and recommending the higher weighting.

The fuel-saving driving evaluation system of the present invention having the above configuration has the following effects.
(1) With a simple procedure for comparing and determining a preset determination value A0 and the acceleration A obtained from the detection signals from the sensors 2 to 5, advice on fuel-saving driving in the start acceleration region can be executed with high accuracy. .
On the other hand, even if there is no uphill determination step, since the margin torque is small and the acceleration is low during uphill running, the uphill running area is not immediately determined as a recommendation (advice) display area, and erroneous display can be avoided.

    (2) A reference value A0 is set for each acceleration at the time of fixed load and empty, and whether the vehicle is loaded or empty using a well-known conventional vehicle mass measuring means (or loaded / empty determination means). If the determination is made based on the determination value A0, it is possible to display a highly accurate advice in consideration of whether the vehicle is being loaded or is empty.

(3) A fuel consumption calculation block (for example, built in the block 7c) is provided, and an analysis calculation of the relationship between the reduction ratio R and the acceleration A and the fuel consumption is performed, so that the fuel consumption in the case of average driving It is possible to quantitatively indicate how much fuel has been saved or consumed relative to the amount.
As a result, it is possible to evaluate the driver with specific numerical values and set a target value, thereby improving the awareness of fuel-saving driving.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
1 to 4 show a first embodiment of the present invention.
In FIG. 1, a vehicle 1 includes an engine rotation sensor 2 that measures an engine speed, an accelerator opening sensor 3 that measures an accelerator opening, a vehicle speed sensor 4 that measures a vehicle speed, an engine load sensor 6 that measures an engine load, A fuel meter 5 for measuring fuel consumption is attached. And these each sensors 2-6 are connected to the vehicle-mounted control unit 7, and the vehicle-mounted control unit 7 is provided in the cab.

The in-vehicle control unit 7 includes a calculation unit 7c, a recording unit 7b, a display unit 7a, and a medium (for example, memory card 15) driving unit.
The calculating means 7c has a function of calculating the travel distance, acceleration, reduction ratio, etc. from the detection signals of the sensors 2-6.
The recording unit 7b has a function of recording the calculation result of the calculation unit 7c and the detection signals of the sensors 2 to 6.
The display means 7a has a function of displaying advice to the driver based on the data processed by the calculation means 7c.
A medium (for example, the memory card 15) operated or driven by the driving means is a storage device for transferring recorded data to the computer 20 of the management department.
As will be described later, the calculation means 7c compares the acceleration value A calculated from the signal data with the acceleration determination value A0 inputted in advance, and when it is determined that “A> A0” in FIG. When it is determined that the area is an advice display area), the display unit 7a has a function of displaying an advice.

  In FIG. 1, wiring is individually provided and connected from each of the sensors 2 to 6 to the in-vehicle control unit 7. On the other hand, when an engine control control unit (ECU: not shown) is provided, each data may be transmitted to the in-vehicle control unit 7 as a digital signal via the ECU. .

  On the other hand, on the management department side, data recorded by the vehicle 1 is input to the computer 20 via the memory card 15 and data processing is executed. And an advice report etc. are created and a feedback is performed with respect to the vehicle 1 side.

  Here, the sensors 2 to 6 and the controller 7 in the vehicle 1 are not connected to each other by individual wires, and as shown in the modified example of FIG. The data measured in 6 may be transmitted to the controller 7.

Hereinafter, with reference to FIG. 3, FIG. 4, the procedure of the fuel-saving driving | operation evaluation in 1st Embodiment is demonstrated.
As the fuel-saving driving operation at the time of start acceleration, there can be mentioned two points: “do not suddenly accelerate” and “perform shift up early”.
In the prior art, if it is detected that the accelerator opening is too large, or if it is detected that the engine speed is too high, for example, “Acceleration is too high!” Or “Let's shift up!” Each advice was displayed.

In contrast, in the fuel-saving driving evaluation system according to the first embodiment, attention is paid to the fact that the acceleration of the vehicle increases when the accelerator opening is too large or when the engine speed is too high. In the fuel-saving driving evaluation system according to the first embodiment, the acceleration of the vehicle is detected and the acceleration of the vehicle is used as a control parameter to evaluate the fuel-saving driving.
The determination of the acceleration detection value A for performing such evaluation is performed as follows.

As shown in FIG. 3, when the reduction ratio R on the horizontal axis (= engine speed / vehicle speed: km / h / rpm) and the acceleration A on the vertical axis, the reduction ratio R is large (low speed stage) and the acceleration A is large. A relationship exists.
In FIG. 3, the characteristic of acceleration and reduction ratio in the case of average driving is set as standard acceleration (A0), and the characteristic of acceleration and reduction ratio in the case of fuel-saving driving is set as target acceleration (A1).

  In the control of the fuel-saving driving evaluation system according to the first embodiment, the reduction ratio and the acceleration of the vehicle 1 (FIG. 1) that is the control target are plotted in FIG. 3, and the plot is an area above the standard acceleration A0. Is detected (when the reduction ratio and acceleration of the vehicle 1 are values that are included in the advice display area indicated by hatching in FIG. 3), the accelerator opening is determined to be too large. Alternatively, it is determined that a shift up is necessary and the corresponding advice is displayed on the display means 7a (FIG. 1).

  When the advice is displayed, the accelerator opening and the engine speed are each weighted in advance, and if the accelerator opening weight is large, “Accelerator is pushed too much!” Is displayed, and the engine speed is weighted. If it is larger, “Let's shift up!” Is displayed.

Next, the procedure for evaluating the fuel-saving operation will be described with reference to the flowchart of FIG.
In FIG. 4, first, in step S1, operation data detected by the sensors 2 to 5 is read.
In step S2, a reduction ratio R [= vehicle speed / engine speed] is calculated, and in step S3, an acceleration A [= current vehicle speed-1 second vehicle speed] is calculated.

Next, in step S4, it is determined whether or not the calculated acceleration A at the reduction ratio R is equal to or greater than an advice determination value A0 (preliminarily input value: see FIG. 3) at the reduction ratio R.
If the acceleration A at the reduction ratio R is below the advice determination value A0 input in advance (No in step S4), this routine is terminated and the process returns.
On the other hand, if the acceleration A at the reduction ratio R is equal to or greater than the advice determination value A0 input in advance (Yes in step S4), the accelerator opening / engine speed is weighted in step S5.

In step S6, it is determined whether or not the weight of the engine speed is larger than the weight of the accelerator opening calculated in step S5, and the weight of the engine speed is larger than the weight of the accelerator opening. If (Yes in step S5), “Let's shift up!” Is displayed in step S7, and the process returns.
On the other hand, if the weighting of the accelerator opening is larger than the weighting of the engine speed (No in Step S5), “Stepping the accelerator too much!” Is displayed in Step S8, and the process returns.

Here, the weighting of the accelerator opening and the engine speed in step S5 will be described.
Accelerator opening weighting is (current accelerator opening-accelerator over-depression determination value) / (constant [90]-accelerator over-depression determination value)
It is performed by the following formula.
In the above formula, the “accelerator excessive depression determination value” is a target value of the accelerator opening.
The “constant” is a constant of the accelerator opening (%) and is a dimensionless amount. In the above formula, 90 (%) is exemplified. This “constant” is given by “Am + σ” when the frequency distribution of the accelerator opening is obtained, the average value is Am, and the standard deviation is σ.

On the other hand,
(Current engine speed−shift-up engine speed determination value) / (constant [2000] −shift-up engine speed determination value)
It is performed by the following formula.
In this equation, the “shift-up engine speed determination value” is a target value of the shift-up engine speed.
The “constant” is a constant of the upshift engine speed, and its unit is rpm. In the above formula, 2000 rpm is exemplified as a constant. The frequency distribution of the shift-up engine speed is obtained, and “Rm + σ ′” when the average value of the shift-up engine speed is Rm and the standard deviation is σ ′ is determined as a “constant”.

Next, a second embodiment of the present invention will be described with reference to FIG.
In the second embodiment of FIG. 5, the method for determining acceleration is different from that of the first embodiment described above.
In the second embodiment, the vehicle 1 is provided with well-known conventional vehicle mass measurement means or empty / carriage determination means (not shown), and a determination value A0 is obtained for acceleration at fixed loading time and when the vehicle is empty. A determination value A0 is set and input in advance, and a determination is made based on this.

By configuring in this way, it is possible to display advice that is given in consideration of whether it is fixed time or empty, in other words, it is possible to display advice with higher accuracy than in the first embodiment.
It should be noted that a plurality of segment areas based on the vehicle mass may be provided, and a determination value A0 may be set for each, and the determination may be made based on the determination value based on the detection value of the vehicle mass measurement means.

Next, a third embodiment of the present invention will be described with reference to FIGS.
In the fuel-saving driving evaluation system according to the third embodiment, a fuel consumption calculation block (not shown) is provided in the calculation means 7 c of the in-vehicle control unit 7.
The fuel consumption calculation block calculates the fuel consumption (actual value or estimated value) from the signal data from the fuel meter 5, analyzes the relationship between the reduction ratio and acceleration and the fuel consumption, and displays the display means 7a or the memory. A function for outputting to the card 15 is provided.

With such a configuration, for example, as shown in FIG. 6, the relationship between the reduction ratio R and the acceleration A can be obtained quantitatively. Alternatively, as shown in FIG. 7, the relationship between the acceleration A and the fuel consumption can be obtained quantitatively.
Then, using the relationship between the reduction ratio R and the acceleration A and the relationship between the acceleration A and the fuel consumption, how much fuel is saved with respect to the fuel consumption when the average driving is performed. Alternatively, it is possible to quantitatively indicate to the driver how much fuel has been consumed.
As a result, it is possible to evaluate the driver with specific numerical values related to fuel, or to set a target value.

  A fuel consumption calculation block (not shown) used in the third embodiment is provided in the computer 20 (see FIGS. 1 and 2) on the management department side, and data is transferred from the vehicle 1 side to the computer 20 via the memory card 15. It is also possible to input and execute an analysis operation.

  It should be noted that the illustrated embodiment is merely an example, and is not a description to limit the technical scope of the present invention.

1 is a block diagram showing a first embodiment of the present invention. The block diagram which shows the modification of 1st Embodiment. The figure explaining the acceleration judgment value of a fuel-saving driving evaluation system. The flowchart which shows the evaluation procedure of a fuel-saving driving | operation evaluation system. The figure explaining the operation principle of 2nd Embodiment of this invention. The figure which shows the relationship between the reduction ratio and acceleration in 3rd Embodiment of this invention. The figure which shows the relationship between the acceleration and fuel consumption in 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Vehicle 2 ... Engine rotation sensor 3 ... Accelerator opening sensor 4 ... Vehicle speed sensor 5 ... Fuel meter 6 ... Engine load sensor 7 ... In-vehicle control unit

Claims (1)

In a fuel-saving driving evaluation system having a recording display means for calculating the acceleration of the vehicle, calculating the weighting of the accelerator opening and the engine speed, and displaying a recommendation to the driver, the record display means displays a recommendation display. An acceleration determination value for making a determination is input in advance, and the record display means compares the acceleration with the acceleration determination value, and when it is determined that it is in the recommended display area, the accelerator opening and the engine A fuel-saving driving evaluation system that performs weighting calculation with the number of revolutions and recommends the higher weighting.

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