Detection Apparatus Of The Portable Vehicle Braking Performance

By analyzing the situations of the equipments for detection automobile brake functionhome and abroad, we designed the equipment for detection automobile brake parametersbased on linear CCD (IT-P1-1024),FPGA (EP2C35) &MCU(89C52).The hardware frame and the methods to calculate the automobile brake parameters aremainly discussed in this thesis.With regards to the hardware design, we use the FPGA to generate a set of strictclocks. Some are provided necessarily for driving the CCD scan the same ground twiceand does it again and again, some are use for control the A/D IC namedAD9057BRS₄0(A/D,8-bit, 40MSPS), which can sample the designation data among theout of CCD; Also we use the FPGA to realize some control circuits, such as the denouncedcircuit of the keyboard; Also we use the FPGA to realize some control circuits, such as thedebounce circuit of the keyboard;With regards to the software design, I have realized the Fast Fourier Transform(FFT) and Inverse Fast Fourier Transform(IFFT) Algorithm to analyze the correlationfunction to calculate automobile speed; I analyses the method of calculating the parametersof automobile brake such as average decrease speed. Software has realized LCD displayingalso.At the end of this paper, I analyze the error of this system and the matters whichmust be taken great attention to.