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Intelligent digital car speedometer calibration station

pleContro1),[link widoczny dla zalogowanych], clear signal R. And latch signal LE. Were controlled shaping, counting and latch circuit. After shaping circuit speed pulse signal after shaping by CD4518 to count. The computer control circuit to generate a sampling control signal shaping circuit will control the sampling time as a pre-established system of sampling asked. At the same time, ensure that each sample before the start of a control circuit and the counter is cleared to ensure that the end of each sample, the microcontroller generates a latch signal. Stored in the BCD code to latch after the driving signal decoding IC CD4511. Finally, the drive signal through the drive circuit is displayed by the display. When you hear every second sampling interval for ease of reading is appropriate. This is the check station - a period the whole working process, which guarantees the check station will be measured by the steady rate of value displayed immediately. Figure 3 is the main timing waveforms. ● l mouth. A sampling control signal s-c-dagger II]. [] E ● Ll mouth and latch signals. Clear signal, control signal timing loop 3 R waveform calibration station focuses on computer control of the part - PIC58BS microcontroller. The product is the source of military power microcontroller based Institute (P & s) developed by the United States Mierochlp's high performance, low cost, low power,[link widoczny dla zalogowanych], small size of the microcontroller PIC16C58. It will cure in BASIC interpreter chip OTPROM in. Its characteristics are: ① power on reset: an external reset circuit when the supply voltage drops to a certain value, the reset signal. ② Write convenient: the user can directly through the three-pin socket and the PC parallel port connected to communicate. ③ t easy to modify an external debug serial memory power to throw into confusion than EPROM,[link widoczny dla zalogowanych], available online debugging changes. ④ programming convenience: BASIC can be used directly in the form of high-level language programming. ⑤ small. Easy to install. ⑧ low power consumption: operating current less than 2mA, sleep current of less than 10p. A. Tester of the use of the microcontroller, the improved calibration sets intelligent, integrated process, while simple, easy to debug, and save space. Table 4 Test results of vehicle speed check station after a successful trial carried out test. Test equipment used in production for Japan's space detector Ono Ying rate of non-contact type speed meter. Specific practice: the surface of the roller test bed for processing, so similar to the road surface,[link widoczny dla zalogowanych], and to ensure its perimeter unchanged; after the lens through the fixing plate installed in the position of 500mm from the drum surface to ensure that the lens surface with the ground and roll vertical, and a bad shot the arrow set of data tied to bad l2 · 1996 No. 2 (No. l31 of the total) towards the first point to the direction of vehicles. Connected to the speedometer calibration monitor with the power to make a more stable rollers rotate in different speeds, namely, the value of the next two shows, for comparison. The table below the curve shown in Figure 4. Which show the value of the abscissa for the validation sets, the vertical axis for the speedometer indication. Blue line is the ideal curve. Speedometer indication (km. - ~) 4 field test results show that: the check station with high linearity, after some amendments, the accuracy can be further improved. It is checking the accuracy of target vehicle speed in full compliance with the requirements of the table. 5 Conclusion The car speed meter calibration station with high accuracy, and use of large models effective word Seven-Segment LED display for easy reading. Data acquisition and control using microcontroller technology that can be easily corrected vehicle speed table - compact and simple, stable and reliable performance. Practice has proved that: the vehicle speed meter calibration station does have a strong practical, is to achieve intelligent vehicle test, a successful range of digital back. Meanwhile, as a product, the calibration table has some versatility, but also can be used for speed, line parameters such as speed and mileage correction. Thanks to the table in the process of trial test vehicle proving ground testing techniques has been Section Nixin Yu, Cheng Jinhua and other comrades of the strong support of the guidance, to express my sincere thank Sheng. Cao Nisshin l995 received a l2-22 (on the next section lO pages) summary of the impact of excessive angular acceleration. 6 Conclusion ① According to the paper molding and the mathematical formula by Dongfeng EQ1030 light vehicle wiper transmission design, show that the mathematical model and formula is feasible. Simulate actual working conditions. Obtained satisfactory results. Essays @ wiper output shaft angle, angular velocity, angular acceleration obtained for the dynamic analysis. Matching the motor to provide initial parameters, specific analysis and solutions,[link widoczny dla zalogowanych], the author also written to be addressed.