Operating method for carrying out road matching by navigator according to change of barometric pressure in vehicle
A working method and navigator technology, applied to road network navigators and other directions, can solve the problems of large pressure difference of air pressure sensor, low precision and inaccuracy of civil GPS signal, etc., and achieve high accuracy and reliability
Active Publication Date: 2014-05-14
CHANGZHOU SHINCO AUTOMOTIVE ELECTRONICS
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Problems solved by technology
[0006] The weak point of above-mentioned prior art is: on the one hand, adopt GPS signal to calculate height, often error is bigger, because the precision of civil GPS signal is generally low, can't accurately draw the height of current vehicle
On the other hand, the use of air pressure sensors to detect the air pressure at the location of the vehicle is often inaccurate.
When the vehicle is stationary and driving, the pressure acting on the air pressure sensor is quite different, resulting in a large difference in the measured results
Method used
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[0018] Below in conjunction with accompanying drawing and embodiment the present invention is described in detail:
[0019] Such as figure 1 , the navigator of the present embodiment includes: a CPU unit, a map generation and display unit with a touch screen connected to the CPU unit, a voice output unit connected to the CPU unit, an air pressure sensor connected to the CPU unit, a A connected vehicle speed measuring unit, a GPS unit connected with the CPU unit, a program database connected with the CPU unit, a temperature and humidity sensor connected with the CPU unit, and a map database connected with the CPU unit. Road path information is stored in the map database, and the road path information includes the attributes of each road section, and the attribute includes information about whether the corresponding road section includes an elevated section that is parallel up and down and an elevated downlink section.
[0020] The vehicle speed measuring unit includes: a plura...
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The invention provides an operating method for carrying out road matching by a navigator according to change of barometric pressure in a vehicle. The method for matching main and side roads by the navigator comprises the steps that if a current vehicle is on a main road and an exit leading to a side road on the right side of the main road exists in 2Km in front of the current vehicle, a CPU (central processing unit) of the navigator obtains a traffic lane image on the main road in real time via a camera arranged at the rear of the current vehicle to judge whether the current vehicle is in the traffic lane on the rightmost side of the main road; if the current vehicle is in the traffic lane on the rightmost side of the main road, whether a traffic lane line in the image deflects clockwise is judged in real time when the current vehicle is about to reach the exit, and if the traffic lane line deflects clockwise, the CPU judges that the current vehicle enters the side road; the navigator matches the current driving route with the side road; if the traffic lane line does not deflect clockwise, the CPU judges that the current vehicle is still on the main road.
Description
[0001] This application is a divisional application, the application number of the original application: 201210112405.5, the title of invention: the working method of the navigator for road matching according to the change of the air pressure in the car, and the application date: 2012-4-17. technical field [0002] The invention relates to the technical field of the working method of the navigator, in particular to a working method for the navigator to perform road matching according to the change of the air pressure in the vehicle. Background technique [0003] In the circuit matching process of existing navigators, it is often necessary to obtain the height information of the carrier for road matching; especially for urban elevated roads, it is necessary to use height information to judge whether the current vehicle is on the elevated road or on the road below the elevated road. [0004] Chinese patent document CN101666643 discloses an altimeter based on barometric pressure...
Claims
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IPC IPC(8): G01C21/30
CPCG01C21/30
Inventor 秦春达
Owner CHANGZHOU SHINCO AUTOMOTIVE ELECTRONICS