Back warning system for vehicle

• US 20050192715A1
• Filed: 08/17/2004
• Published: 09/01/2005
• Est. Priority Date: 08/19/2003
• Status: Abandoned Application

• Current Assignee: Hyundai AMCO Company Limited (Hyundai Mobis Co., Ltd.)
• Original Assignee: Hyundai AMCO Company Limited (Hyundai Mobis Co., Ltd.)
• Inventors: Kim, Ho-Kyung
• Application Number:
  US10/920,100
• Publication Number:
  US 20050192715A1
• Time in Patent Office: Days
• US Class Current: 701/1
• CPC Class Codes: G01S 2013/9317 Driving backwards
• CPC Class Codes: G01S 2013/93272 in the back of the vehicles
• CPC Class Codes: G01S 2013/93275 in the bumper area
• CPC Class Codes: G01S 7/52004 Means for monitoring or calibrating short-range imaging G01S7/5205
• CPC Class Codes: G01S 7/5276 using analogue techniques

Abstract

The present invention relates to a back warning system for a vehicle. In the present invention, an object that needs an alarm is fully detected and an object that does not need an alarm are accurately detected and recognized using an internal type programmable reference voltage module that is installed in the interior of the CPU and is capable of generating various reference voltage values based on an input program constant value. Therefore, in the present invention, a tuning work is quickly achieved. A tuning work can be easily performed as compared to a conventional back warning system for a vehicle using an external comparator installed independently from a CPU. It is possible to significantly decrease the time needed for a tuning work. Actually, the time can be decreased from about 30 days to one day.

Claims

1. A back warning system for a vehicle, comprising:

a plurality of ultrasonic wave sensors that are installed in a rear bumper of a vehicle and each are formed of a transmitter capable of radiating ultrasonic waves based on a driving signal and a receiver capable of receiving a signal reflected from an object;

a driving circuit that transfers a driving signal to each ultrasonic wave sensor;

a reflection driving circuit that is operated in cooperation with the driving circuit and receives a reflection signal from each ultrasonic wave sensor;

a first bandwidth filter that filters a reflection signal of each ultrasonic wave sensor received by the reflection driving circuit with a certain frequency bandwidth;

a second bandwidth filter that filters the filtered reflection signal with the same frequency bandwidth as the frequency bandwidth of the first bandwidth filter 40a;

an amplification circuit that amplifies a reflection signal passed through the second bandwidth filter with a certain amplification ratio;

a wave detection circuit that wave-detects a reflection signal passed through the amplification circuit; and

a central processing unit (CPU) that includes a reference voltage adjusting register that outputs various program constant values for setting various reference voltage values for recognition in response to an operation of a timer and the ultrasonic wave sensor, and a programmable reference voltage module that outputs various reference voltage values in response to a program constant value from the reference voltage adjusting register, wherein said CPU outputs a driving signal for driving each ultrasonic wave sensor, and controls the operations of the driving circuit and the reflection driving circuit, and compares a voltage value of the reflection signal passed through the wave detection circuit with a reference voltage value of the programmable reference voltage module, and outputs an object alarm signal to a warning apparatus when the voltage value of the reflection signal is larger than the reference voltage value of the programmable reference voltage module when the voltage value of the reflection signal is higher than the reference voltage value of the programmable reference voltage module as a result of the comparison.

2. The system of claim 1, wherein said internal programmable reference voltage module of the CPU outputs a reference voltage value in 32 levels in a range of 0 through 3.5V in response to a program constant value from the reference voltage adjusting register.