WO2012034257A1

WO2012034257A1 - Method and device for prompting driver with vehicle efficacy state at real time

Info

Publication number: WO2012034257A1
Application number: PCT/CN2010/001786
Authority: WO
Inventors: 沈磊
Original assignee: Shen Lei
Priority date: 2010-09-17
Filing date: 2010-11-08
Publication date: 2012-03-22
Also published as: CN101968943A; CN101968943B

Abstract

A device (1) for prompting driver with vehicle efficacy state at real time comprises a microprocessor (2), a memory (3), a graphic display (4) and a digital communication interface (5) which connects to an electronic control unit (6) of a vehicle power device. An efficacy characteristic curve pattern is stored to the memory (3) in advance and is displayed on the graphic display (4). The device (1) is connected with the electronic control unit (6) of the power device via a data bus link (7) to form a communication network so as to read and record rotational speed and resistance torque value of the power device at real time and realize pattern dynamic display. A prompting driver with vehicle efficacy state at real time is also provided.

Description

Method and device for prompting driver energy efficiency state of vehicle in real time

The invention belongs to the field of work transportation, and relates to a method and device for prompting a driver's vehicle energy efficiency state in real time, which can be applied to automobile electronic industries such as vehicle smart meters and car navigation systems. Background technique

In recent years, the number of automobiles has grown rapidly. How to find a suitable way or method to achieve the maximum energy conservation and emission reduction as soon as possible will undoubtedly test the wisdom of the whole industry.

In fact, vehicle driving technology and maintenance have a significant impact on energy conservation and emission reduction of transportation operations. Under the same conditions of use, different vehicle technical conditions and different drivers' fuel consumption per 100 kilometers are quite different. Therefore, improving driver operating techniques and proper maintenance are important fuel-saving measures.

In theory, the design conditions of the vehicle's power plant should be at the highest efficiency point, that is, the lowest fuel consumption rate and the best emissions at maximum power and maximum torque output. However, due to the complexity of the actual working process, the design working condition point does not necessarily coincide with the optimal working condition point, and efforts to control its operating condition point in the high efficiency area of the external characteristic curve of the power unit can make the automobile Achieving better economy, power and emissions is important for vehicle optimization of power matching and safe economic operation.

At present, only the maintenance experts can find out the data of each engine's own external characteristic curve from the manual data. These data can not guide the driver in the best way to drive in real time. Because ordinary drivers can only see the speed and speed values from the car meter, they can’t get real Data such as the torque at the working point during driving, and so far there is no device that can be widely used on the dashboard or center console of the car to allow the driver to visually observe the vehicle's energy efficiency characteristic curve and dynamic working point. At present, there is no automobile instrument and navigator capable of displaying the energy efficiency characteristic diagram of the vehicle power unit and its dynamic working point. Therefore, the majority of drivers are unable to understand and find the best working point of each car through the energy efficiency characteristic curve.

Summary of the invention

In view of the above problems in the prior art, the object of the present invention is to provide a method and apparatus for promptly indicating the energy efficiency state of a driver's vehicle, which can be used as a popular driver energy saving assistant and daily tool installed in an automobile instrument panel or a central console. It collects the speed and torque of the vehicle power unit in real time and plots the energy efficiency curve with the rotational speed as the abscissa and the torque as the ordinate on the liquid crystal display of the smart car instrument or the car navigation system with the graphic display, which can prompt the driver of the current vehicle. Fuel economy work point, through real-time and historical dynamic data analysis, optimize driving habits to save fuel consumption, give visual assessment of the driver's current operation, to help drivers analyze and improve their own driving efficiency, and to train drivers The role of economic driving habits, while the invention can also reduce engine maintenance costs and extend the life of the engine.

For the purpose of the present invention, a method for prompting a vehicle energy efficiency state in real time according to the present invention includes the following steps:

1) installing an energy-suppressing microcomputer device including a microprocessor, a memory, a graphic display, and a vehicle data bus interface into an automobile instrument panel or a center console;

2) From the manual data of the specific vehicle power unit, find the external characteristic curve data of the power unit under the best working conditions, and the effective power Ne and effective torque under other working conditions (also known as Net torque) Me, hour fuel consumption GT or effective fuel consumption rate Ge, etc., as a function of the speed n, and superimposed and graphically edited on the same coordinate system, such as the peer fuel consumption rate line, target The best working area, etc. are marked, and different energy-effect areas are filled with different colors, so that the drawing is intuitive and simple, and it is convenient for the driver to distinguish the energy consumption interval and the clear working target. The processed graphics are pre-stored in the energy-saving prompting microcomputer. In the memory of the device, and displayed as a background diagram of the static energy efficiency characteristic curve on the graphic display thereof;) connecting the electronic control unit of the vehicle power device through the vehicle data bus interface, reading and recording the rotational speed n of the power device under the current working condition Total torque;) The resistance torque value of the specific vehicle power unit is obtained by the data and stored in the memory of the energy-efficiency prompting microcomputer device, and the total torque minus the resistance torque is obtained to obtain the output net torque Me; The abscissa, using the net torque of the actual operating point as the ordinate to determine the vehicle dynamics The coordinate of the point is (n, Me); ) In order to realize the dynamic display of the graphic, coordinate the coordinates of the dynamic working point under the current working condition to obtain the corresponding pixel coordinates of the graphic display, which can be displayed on the background image of the static energy efficiency characteristic curve. The real-time and historical position of the actual dynamic working point of the vehicle, the coordinate transformation can be linear conversion, etc. The following formula is one of the linear transformation methods: Assume the origin coordinate value of the lower left corner of the static energy efficiency background image (n _min , Me _min Corresponding to the pixel coordinates (P _n , Py _min ) of the graphic display, the coordinates of the vertex in the upper right corner of the figure (r , Me _raax ) correspond to the pixel coordinates of the graphic display (Px _raax , Py _nax ), and the dynamic working point under the current working condition The coordinates (n, Me) are converted into corresponding graphic display pixel coordinates (Px, Py) to plot the actual dynamic working point of the vehicle, where: Px= (n- n _mi „) * (Px _na x-Px»in) / (n _max - n _Bin ) +Px _ni „

Py=(Me-Me _rain ) * (Py„ _ax -Py _min ) / (Me - Me _nin ) +Py _{min For} the purpose of the present invention, the present invention also provides a device for promptly indicating the energy efficiency state of a driver's vehicle, the device It can be installed in the car dashboard or in the center console of the car, including a microprocessor, a memory, a graphic display, a digital communication interface connecting the electronic control unit of the vehicle power unit, etc., and the device can map the energy efficiency of the specific vehicle power device. Pre-stored in the memory and displayed on the graphic display as a static energy-efficient background graphic, the device can be connected to the electronic control unit of the power device via a data bus link to form a communication network, and the power device is read and recorded. The rotational speed n and the total torque under working conditions, the total torque is subtracted from the resistance torque to obtain the output net torque Me; the rotational speed in the current working condition is the abscissa, and the net torque in the actual operating point is taken as the ordinate, thereby determining vehicle dynamic operating point of coordinates (n Me), obtain real-time operating point _(n, Me), then dynamically displayed on the graphical display as the preferred For example, the device may be a smart car instrument or a navigator with a graphic display. Due to the above technical solution, the invention can track the movement of the working point of the power device in real time, and can visually display the working point on the energy efficiency curve through a graphical interface. The location, prompting the driver whether the engine is in the best economic state, can also optimize the driving habits of the driver through historical data analysis, thereby improving the economics of driving the vehicle.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention will be further described with reference to the accompanying drawings and specific embodiments: FIG. 1 is a structural block diagram of an apparatus for prompting a driver's vehicle energy efficiency state in real time according to the present invention; 2 is a power characteristic table corresponding to a vehicle power device in the present invention; FIG. 3 is a diagram showing a complete power display effect of a device for prompting a driver's vehicle energy efficiency state in real time according to the present invention (the black point in the figure is the actual operating point of the power device); FIG. 4 is a simplified diagram of a powerless display effect of a device for promptly indicating the energy efficiency state of a driver's vehicle according to the present invention (the black point in the figure is the actual operating point of the power device).

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1 , a device for prompting a driver's vehicle energy efficiency state in real time can be installed in an automobile instrument panel or a car center console, and includes an energy-efficiency prompting microcomputer device provided with an energy-efficiency prompt graphic display 4 . 1. The electronic control unit 6 of the power device supporting the digital communication, the energy-efficiency suggesting that the microcomputer device 1 further comprises a microprocessor 2, a memory 3, and an electronic control for connecting the power device (the engine of the conventional vehicle or the motor of the new energy vehicle) The unit 5 reads the digital communication interface 5 of the power unit speed and torque, and the digital communication interface 5 can effectively indicate that the microcomputer device 1 and the electronic control unit 6 of the power unit are connected via a data bus link to form a communication network, and read And record the speed n and the total torque of the power device under the current working condition, calculate the total torque minus the resistance torque to obtain the output net torque Me; the speed under the current working condition is the abscissa, and the net torque at the actual working point is The ordinate, thereby determining the coordinates of the dynamic working point of the vehicle as ( _n , Me): obtaining the real-time working point (n, Me), and then displaying in the graph Dynamic display on the device. In this embodiment, the energy-efficiency prompting micro-computer device display is a graphic display, and the data bus is a J1939 bus. The real-time display method of vehicle energy efficiency implemented by the device includes the following steps:

1) installing an energy-efficiency prompting microcomputer device including a microprocessor, a memory, a graphic display, and a vehicle data bus interface into an automobile instrument panel or a center console; 2) From the manual data of the specific vehicle power unit, find the external characteristic curve data of the power plant under the best working condition, and the effective power Ne, effective torque (also called the net torque) Me, hourly fuel consumption under other working conditions. GT or effective fuel consumption rate Ge, etc., as a function of the speed n, and superimposed and graphically edited on the same coordinate system, such as the equivalent fuel consumption rate line, the target best working area, etc. The energy-efficiency area is filled with different colors, so that the drawing is intuitive and simple, and it is convenient for the driver to distinguish the energy consumption interval and the clear working target. The processed graphics are pre-stored in the memory of the energy-saving prompting microcomputer device and serve as static energy-efficiency characteristics. The curve background image is displayed on its graphical display;

3) Connect the electronic control unit of the vehicle power unit through the CAN/J1939 vehicle data bus interface, and read and record the speed n and total torque of the power unit under the current working condition;

4) Obtain the resistance torque value of the specific vehicle power device by using the data and store it in the memory of the energy-saving prompting microcomputer device, calculate the total torque minus the resistance torque to obtain the output net torque Me; and use the rotation speed under the current working condition as the abscissa Taking the net torque of the actual operating point as the ordinate, thereby determining that the dynamic working point coordinate of the vehicle is (n, Me) (as shown in FIGS. 3 and 4);

5) In order to realize the dynamic display of the graphic, the coordinates of the dynamic working point under the current working condition are coordinate-converted to obtain the pixel coordinates of the corresponding graphic display, and the actual dynamic working point of the vehicle can be displayed on the background map of the static energy efficiency characteristic curve. Real-time and historical position, coordinate transformation can be linear conversion, etc. The following formula is one of the linear transformation methods: Assume that the origin coordinate value (n _nin , Me„ _in ) _{in the} lower left corner of the static energy effect background map corresponds to the pixel coordinates of the graphic display (P _In , Py _rain ), the coordinates of the vertex in the upper right corner of the figure (n _max , Me _max ) correspond to the pixel coordinates of the graphic display (P _X Py _ma J, then the dynamic working point coordinates under the current working condition) (n Me) is converted into corresponding graphic display pixel coordinates (Px, Py) to plot the actual dynamic working point of the vehicle, where:

Px (n - n _ffli „) * (Px _ffl a _X -Px«,in) / (r _x - n _min ) +Px _min

Py (Me-Me _min ) * (Py - Py _mi „) I (Me - Me _nin ) +Py _min

6) On the energy efficiency map, move the black point to the location specified by the current working point coordinate. The display effect is shown in Figure 3 and Figure 4. The black point in the figure tracks the position of the characteristic point of the power unit in real time. When the black point is in the top center area, the power output of the power unit is large and the energy consumption is small, which is a relatively economical area. The closer the black point is to the area, the better the economy, thus giving the driver a hint. However, the above-described embodiments are merely exemplary in order to better understand the patents of those skilled in the art, and are not to be construed as limiting the scope of the invention; as long as it is made according to the spirit of the present disclosure. Equivalent changes or modifications are included in the scope of this patent.

Claims

Rights request

A method for promptly indicating a driver's vehicle energy efficiency state, characterized in that: the following steps are included:

1) installing an energy-efficiency prompting microcomputer device including a microprocessor, a memory, a graphic display, and a vehicle data bus interface into an automobile instrument panel or a center console;

2) From the manual data of the specific vehicle power unit, find the external characteristic curve data of the power unit under the best working condition, and the effective power Ne, the net torque Me, the hour fuel consumption GT or the effective fuel consumption rate under other working conditions. Ge and other data related to the change of the rotational speed n, and superimposed and graphically edited on the same coordinate system, such as the equivalent fuel consumption rate line, the target best working area, etc., different colors for different energy efficiency areas Filling processing, etc., make the drawing intuitive and concise, and it is convenient for the driver to distinguish the energy consumption interval and the clear working target. The processed graphics are pre-stored in the memory of the energy-efficiency prompting microcomputer device, and are used as the background diagram of the static energy-efficiency characteristic curve. Displayed on the display;

3) connecting the electronic control unit of the vehicle power unit through the vehicle data bus interface, reading and recording the speed n and the total torque of the power unit under the current working condition;

4) storing the resistance torque value of the specific vehicle power device in the memory of the energy-efficiency prompting microcomputer device, obtaining the output net torque Me from the total torque minus the resistance torque; and using the rotational speed in the current working condition as the abscissa, The net torque at the actual operating point is the ordinate, so that the coordinates of the dynamic working point of the vehicle are (n, Me):

5) In order to realize the dynamic display of the graphic, the coordinates of the dynamic working point under the current working condition are coordinate-converted to obtain the pixel coordinates of the corresponding graphic display, and the actual dynamic working point of the vehicle can be displayed on the background image of the static energy efficiency characteristic curve. Real time and calendar The position of the history, the coordinate transformation can be linear conversion, etc. The following formula is one of the linear transformation methods: Assume that the origin coordinate value of the lower left corner of the static energy efficiency background image (n _ni „, Me _min ) corresponds to the pixel coordinates of the graphic display (Px _min , Py„ _in ), the vertex coordinate value (n _nax , Me _raax ) _in the upper right corner of the figure corresponds to the pixel coordinates of the graphic display (Px _MX , Py _MX ), and the dynamic working point coordinates (n, Me ) in the current working condition are converted into Corresponding graphic display pixel coordinates (Px, Py) plot the actual dynamic working point of the vehicle, where:

Py II (Me-Me _fflin ) * (Py _ma plant Py _nin ) I (Me leg - Me _nin ) + Py _ffli „ , a device that prompts the driver's vehicle energy efficiency state in real time, characterized in that the device is installed in a car instrument The computer or the central console of the vehicle comprises a microprocessor, a memory, a graphic display, a digital communication interface connected to the electronic control unit of the vehicle power unit, and the like, and the device pre-stores the energy efficiency characteristic map of the specific vehicle power device in the memory. And displayed as a static energy effect background graphic on the graphic display, the device and the electronic control unit of the power device are connected via a data bus link to form a communication network, and the speed of the power device under current working conditions is read and recorded in real time. And the total torque, calculate the total torque minus the resistance torque to obtain the output net torque Me; the speed under the current working condition is the abscissa, and the net torque of the actual working point is the ordinate, thereby determining the coordinates of the dynamic working point of the vehicle (n, Me), that is, a real-time working point (n, Me) is obtained, and then dynamically displayed on the graphic display. The device is characterized in that: the device is a smart car instrument or navigator with a graphical display.