Car reversal radar that automatically modifies the sensor scanning range and method of the same
First Claim
1. A method of automatically modifying the sensor scanning range of a car reversal radar for the central processing unit (CPU) of a car reversal radar, comprising the steps of:
- predetermining compensation values for the ultrasonic sensors and a threshold distance;
when the car reversal radar starts, sending out ultrasonic waves from the ultrasonic sensors to detect any obstacle and obtaining initial sensing results from the ultrasonic sensors;
storing each of the initial sensing results as an initial sensing value;
continuously detecting obstacles using the ultrasonic sensors, obtaining a plurality of subsequent sensing results from the ultrasonic sensors;
storing each of the subsequent sensing results as a subsequent sensing value;
when the subsequent sensing value of any of the ultrasonic sensors is greater than the corresponding “
initial sensing value+compensation value,”
determining that an obstacle is detected and computing the actual distance between the obstacle and the ultrasonic sensor; and
if the actual distance between the obstacle and the ultrasonic sensors on both sides at the back of the car is greater than the threshold distance, increasing the compensation value to reduce the sensitivity thereof.
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Abstract
A car reversal radar automatically modifies the sensor scanning range and the method of the same. The car reversal radar includes a central processing unit that has predetermined compensation value and threshold distance. When the car reversal radar starts, its surrounding environment is recorded into an initial detecting value. The initial detecting value is compared with a subsequent detecting value recorded for the environment when the car is being backed. When the subsequent detecting value is greater than the sum of the initial detecting value and the compensation value, the distance between an obstacle and the ultrasonic sensor of the car is compared with the threshold distance. If the former is greater than the latter, the compensation value is increased. Therefore, the obstacle has to even closer to the ultrasonic sensor to reduce the sensitivity of the ultrasonic sensors at the tail and to prevent incorrect actions.
17 Citations
11 Claims
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1. A method of automatically modifying the sensor scanning range of a car reversal radar for the central processing unit (CPU) of a car reversal radar, comprising the steps of:
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predetermining compensation values for the ultrasonic sensors and a threshold distance; when the car reversal radar starts, sending out ultrasonic waves from the ultrasonic sensors to detect any obstacle and obtaining initial sensing results from the ultrasonic sensors; storing each of the initial sensing results as an initial sensing value; continuously detecting obstacles using the ultrasonic sensors, obtaining a plurality of subsequent sensing results from the ultrasonic sensors; storing each of the subsequent sensing results as a subsequent sensing value; when the subsequent sensing value of any of the ultrasonic sensors is greater than the corresponding “
initial sensing value+compensation value,”
determining that an obstacle is detected and computing the actual distance between the obstacle and the ultrasonic sensor; andif the actual distance between the obstacle and the ultrasonic sensors on both sides at the back of the car is greater than the threshold distance, increasing the compensation value to reduce the sensitivity thereof. - View Dependent Claims (2)
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3. A car reversal radar that automatically modifies its sensor scanning range, comprising:
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a CPU; a memory unit connected to the CPU; an ultrasonic wave transceiving module, which is used to emit and receive ultrasonic waves, and including a plurality of sensor drivers and a plurality of ultrasonic sensors;
wherein each of the ultrasonic sensors is coupled to the CPU via one of the sensor drivers and the CPU controls to the ultrasonic sensors to send out ultrasonic waves;a signal amplifying module, which is connected between the CPU and the ultrasonic transceiving module for amplifying the signals received by the ultrasonic sensors and then sending them to the CPU; and a warning module, which is connected to the CPU for notifying the driver about the obstacle. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11)
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Specification