CN203587097U - Vehicle-mounted road slope recognition device based on embedded-type system - Google Patents
Vehicle-mounted road slope recognition device based on embedded-type system Download PDFInfo
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- CN203587097U CN203587097U CN201320388442.9U CN201320388442U CN203587097U CN 203587097 U CN203587097 U CN 203587097U CN 201320388442 U CN201320388442 U CN 201320388442U CN 203587097 U CN203587097 U CN 203587097U
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Abstract
The utility model discloses a vehicle-mounted road slope recognition device based on an embedded-type system. The vehicle-mounted road slope recognition device based on the embedded-type system is characterized by comprising a vehicle-mounted embedded-type computer with three serial ports, an accelerated speed module, a vehicle speed module and a timer, wherein the accelerated speed module is connected with the vehicle-mounted embedded-type computer by a first serial port; the vehicle speed module is connected with the vehicle-mounted embedded-type computer by a second serial port; the timer is connected with the vehicle-mounted embedded-type computer by a third serial port; the accelerated speed module is composed of an accelerated speed sensor, an analog-digital conversion module and a singlechip; an output end of the accelerated speed sensor is connected with the singlechip by the analog-digital conversion module; the singlechip is connected with an input end of the embedded-type computer by a serial port; a power supplying module supplies electricity for each module by a vehicle-mounted power supply.
Description
Technical field
The utility model belongs to vehicle electronics technical field, particularly a kind of vehicle-mounted road grade recognition device based on embedded system.
Background technology
Acceleration transducer is a kind of electronic equipment that can measure accelerating force.Nowadays, acceleration transducer is towards more and more miniaturization, future development cheaply, and they have important using value in fields such as space flight, guidance, navigation and automobiles.Especially at automotive field, micro-machine acceleration transducer has successfully been applied to vehicle electric field cheaply, comprises the aspects such as safe automobile air bag, vibration compensation, antiskid system, for improving navigability, security and the comfortableness of automobile.
Identification of road grade is when Vehicle Driving Cycle, to utilize the sensing element collection vehicle be arranged on the vehicle parameter of travelling, and calculates accordingly the gradient of Vehicle Driving Cycle place road.Existing identification of road grade method is generally carried out gradient identification according to dynamics of vehicle equation.While applying these class methods, need comparatively accurate a plurality of vehicle parameters that gather, comprise motor torque, current gear, wheel speed and damping force etc.This method is generally difficult to realize for the low cost vehicle-mounted application in enormous quantities towards commercialization.For example, in Vehicular navigation system, need to identify road grade to judge whether vehicle travels at upper and lower bridge.If utilize said method to realize gradient identification, just there is sensor high cost, mounting arrangements inconvenience, and calculate the problems such as too complicated.
Utility model content
The purpose of this utility model is the demand for low-cost commercialization vehicular applications, proposes a kind of vehicle-mounted road grade recognition device based on embedded system.The utility model adopts low cost acceleration sensor, coordinates speed of a motor vehicle module as sensing element, is aided with timer cheaply, has the features such as cost is low, volume is little, precision is high, easy for installation.
The vehicle-mounted road grade recognition device based on embedded system the utility model proposes, it is characterized in that, this device comprises the vehicle-mounted embedded type computing machine with three serial ports, the acceleration module being connected with vehicle-mounted embedded type computing machine by first serial ports, the speed of a motor vehicle module being connected with vehicle-mounted embedded type computing machine by second serial ports, and by the 3rd timer that serial ports is connected with embedded computer; Described acceleration module is by an acceleration transducer, an analog-digital conversion module and a single-chip microcomputer form, the output terminal of this acceleration transducer is connected with single-chip microcomputer by analog-digital conversion module, described single-chip microcomputer is connected with the input end of described embedded computer by serial ports, and supply module is each module for power supply by vehicle power.
Utilize this device, with timer, arrange and control data sampling interval, when speed of a motor vehicle module is sent data, order reads acceleration information and vehicle speed data, according to a moment acceleration information on a moment vehicle speed data and timer on current vehicle speed and timer, can calculate road grade.
Feature of the present utility model and effect:
The vehicle-mounted road grade recognition device based on embedded system the utility model proposes, adopt low cost acceleration sensor, coordinate speed of a motor vehicle module, if speedometer or global positioning satellite module are as sensing element, there is the features such as cost is low, volume is little, precision is high, easy for installation.Utilize this device in real time vehicle speed data and acceleration information to be measured, according to measurement data, can calculate road grade.Its computing method are easy, efficient, can meet most of demand for precision and the not high low-cost commercialization vehicular applications of requirement of real-time.
Accompanying drawing explanation
Fig. 1 is the structural drawing of device described in the utility model.
Embodiment
The vehicle-mounted road grade recognition device based on embedded system the utility model proposes by reference to the accompanying drawings and embodiment be described in detail as follows:
The structure of the utility model device as shown in Figure 1, this device comprises the vehicle-mounted embedded type computing machine with three serial ports, the acceleration module being connected with vehicle-mounted embedded type computing machine by first serial ports, the speed of a motor vehicle module being connected with vehicle-mounted embedded type computing machine by second serial ports, and by the 3rd timer that serial ports is connected with embedded computer; Described acceleration module is by an acceleration transducer, an analog-digital conversion module and a single-chip microcomputer form, the output terminal of this acceleration transducer is connected with single-chip microcomputer by analog-digital conversion module, described single-chip microcomputer is connected with the input end of described embedded computer by serial ports, and supply module is each module for power supply by vehicle power.Composition and the function of each parts embodiment of the utility model device are respectively described below:
(1) acceleration transducer, the low-cost single axle acceleration sensor ADXL103 that adopts ADI company to produce in the utility model; While being used for, true feeling is subject to vehicle acceleration, and vehicle acceleration is converted into analog information output.
(2) single-chip microcomputer, 8 single-chip microcomputer MC68H908GZ16 that adopt Freescale company to produce in the utility model; For timing acquiring digital acceleration information, and the information exchange of collection is crossed to serial ports send out.
(3) analog-digital conversion module (being called for short A/D conversion), 10 A/D modular converters that adopt single-chip microcomputer to carry in the utility model; For converting the acceleration simulation information receiving to numerical information.
(4) speed of a motor vehicle module, adopts Global Positioning System (GPS) (being called for short GPS) module, for obtaining speed information in the utility model;
(5) embedded computer, adopts the common vehicle-mounted embedded type computing machine with three serial ports, for calculating road grade according to the acceleration information receiving and speed information;
(6) timer, can arrange the speed of a motor vehicle sampling time interval that embedded computer is taked according to artificial setting;
(7) supply module is each module for power supply by vehicle power.
Wherein, the output terminal of degree of will speed up sensor is changed with single-chip microcomputer input end and is connected and is made into circuit board by A/D, forms acceleration module.In this module, single-chip microcomputer carrys out the digital acceleration information of timing acquiring A/D modular converter output neatly according to the setting of timer, and the information exchange of collection is crossed to serial ports 1 and send into embedded computer.
Speed of a motor vehicle module, the GPS module in the utility model is connected with embedded computer by serial ports 2.
Vehicle-mounted road grade recognition device is installed onboard, guaranteed that the sensitive axes forward of acceleration transducer is aimed at headstock direction.
The flow process of utilizing said apparatus to carry out identification of road grade comprises the following steps:
(1) moment speed of a motor vehicle v (t-1) and upper sensor acceleration a is constantly set
s(t-1) be invalid value;
(2) wait for that serial ports 2 receives vehicle speed data;
(3), when serial ports 2 receives vehicle speed data, order is carved into all acceleration informations in the t moment and the vehicle speed data in serial ports 2 buffer memorys while reading the t-1 receiving in serial ports 1 buffer memory;
(4) empty serial ports 1 and serial ports 2 buffer memorys;
(5) acceleration information described step (3) being obtained is got algebraic mean value, as working as front sensor acceleration a
s(t);
(6) if constantly speed of a motor vehicle v (t-1) is all effective for current vehicle speed v (t) and upper, according to current vehicle speed v (t) and upper constantly speed of a motor vehicle v (t-1) calculated the acceleration of motion a in a upper moment
m, otherwise an acceleration of motion a is constantly set (t-1)
m(t-1) be invalid value;
(7) if the sensor acceleration a in a upper moment
sand upper one acceleration of motion a constantly (t-1)
m(t-1) all effective, according to sensor acceleration a
sand upper one acceleration of motion a constantly (t-1)
m(t-1) calculate road grade θ, as the road grade value of current identification; Otherwise road grade θ is set, it is invalid value;
(8) upgrading current vehicle speed v (t) is a upper moment speed of a motor vehicle v (t-1), upgrades as front sensor acceleration a
s(t) be a upper moment sensor acceleration a
s(t-1);
(9) repeating step (3)-(8), the identification of real road grade while completing.
In above-mentioned steps (6), according to current vehicle speed v (t) and upper speed of a motor vehicle v (t-1) calculating constantly upper one acceleration of motion a constantly
m(t-1) method is shown below:
a
m(t-1)＝[v(t)-v(t-1)]/T
Wherein, T is the time interval that receives vehicle speed data, can set by timer.
In above-mentioned steps (7), according to the sensor acceleration a in a upper moment
sand upper one acceleration of motion a constantly (t-1)
m(t-1) method of calculating road grade θ is shown below:
θ＝[a
s(t-1)-a
m(t-1)]/g
Wherein, g is acceleration of gravity constant, is taken as 9.8m/s
2.
Claims (7)
1. the vehicle-mounted road grade recognition device based on embedded system, comprise: the vehicle-mounted embedded type computing machine with three serial ports, the acceleration module being connected with vehicle-mounted embedded type computing machine by first serial ports, the speed of a motor vehicle module being connected with vehicle-mounted embedded type computing machine by second serial ports, and by the 3rd timer that serial ports is connected with embedded computer; Described acceleration module is by an acceleration transducer, an analog-digital conversion module and a single-chip microcomputer form, the output terminal of this acceleration transducer is connected with single-chip microcomputer by analog-digital conversion module, described single-chip microcomputer is connected with the input end of described embedded computer by serial ports, and supply module is each module for power supply by vehicle power.
2. recognition device as claimed in claim 1, wherein, described acceleration transducer is single-axis acceleration sensors.
3. recognition device as claimed in claim 2, wherein, described speed of a motor vehicle module is Global Positioning System (GPS) (GPS).
4. recognition device as claimed in claim 2, wherein, described single-chip microcomputer is 8 single-chip microcomputer MC68H908GZ16 that Freescale company produces.
5. recognition device as claimed in claim 2, wherein, described analog-digital conversion module is 10 A/D modular converters that single-chip microcomputer carries.
6. recognition device as claimed in claim 1, wherein, modules is integrated on same surface-mounted integrated circuit.
7. recognition device as claimed in claim 2, wherein, the sensitive axes of described acceleration transducer is over against headstock direction.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320388442.9U CN203587097U (en) | 2013-07-02 | 2013-07-02 | Vehicle-mounted road slope recognition device based on embedded-type system |
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|---|---|---|---|
| CN201320388442.9U CN203587097U (en) | 2013-07-02 | 2013-07-02 | Vehicle-mounted road slope recognition device based on embedded-type system |
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| CN203587097U true CN203587097U (en) | 2014-05-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111731308A (en) * | 2020-06-17 | 2020-10-02 | 东风汽车有限公司 | Gradient estimation method, storage medium, and electronic device |
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2013
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111731308A (en) * | 2020-06-17 | 2020-10-02 | 东风汽车有限公司 | Gradient estimation method, storage medium, and electronic device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140507 Termination date: 20150702 |
|
| EXPY | Termination of patent right or utility model |