The application of electronic technology in automobile instrument - the automobile instrument isGong Gong gradually upgrading, by the pointer to the function of low accuracy, high precision and intelligent instrument, in addition to a variety of operation condition of the display of the car, andalarm automatically adjust the multi function oriented man-machine dialogue intelligent function. To improve the safety and economy of automobile ride comfort have effect.
According to the development of jiajialy safe electronic instrument that explicitly, began in the 60's.But the electronic components are not up to the level of use of loading. In the second half of 70,with the development of semiconductor technology and significant component technology, the clock radio is used on the fluorescent tube 13 light emitting diode display coin 10 electronic display. In 1978 the advent of electronic display instrument. In early 90 the world has more than 60 kinds ofmodels using electronic instrument. In the future, in order to adapt to the needs of the information society, the automobile wide various information display instrument. With the development of high performance electronic display technology, the advantages of the electronic card will be more and more in a variety of models show.
Electronic speed due to the accuracy with high sensitivity, and can automatic, advantages and working in high temperature and low temperature wet vibration and other harsh conditions, so theapplication of more. Most of the liquid crystal display speed vacuum fluorescent display with obviousengine speed, it uses the primary pulse signal of engine speed measurement of the ignition system,the input pulse signal microcomputer measured in each pulse cycle, with a pulse cycle to calculate the average engine speed.
Jiajialy safe said the car speed calculation there are two basic methods, is to calculate in a fixedtime period based sensor pulse output; a fixed pulse cycle time required to complete themeasurement. The previous ten methods as an example when the detected signal from the vehicle speed sensor appears, the microcomputer calculation of the automobile speed start pulsegeneration. When a predetermined period of time past, the calculation operation is over. Then thecalculation and storage of digital computer digital comparison; if the difference between them is 1 or more, the calculation to the digital display circuit, to update the display value.
In order to carry out the digital thermometer accurate measurement and control of automobileengine cooling water temperature, in cylinder combustion temperature and the temperature of the bearing can be measured using a digital thermometer.
The temperature sensor temperature to be measured into electricalsignals definite functionrelationship. But the signal is weak, to be amplified to 40 conversion, the electrical signal mountaintemperature sensor into analog quantity into digital quantity corresponding to the. Through thedecoder, showing the measured temperature by photo display device.
The mileage mileage accumulated to storage and significant driving distance. Jiajialy safe said this type of mileage two, short distance mileage, the driver can adjust the required readings, to re record the mileage, may at any time is zero; the total distance of the vehicle mileage. Two miles is calculated from the vehicle speed sensor pulse and its storage. The power and the battery inputpulse measurement microcomputer connection. This is the battery support system, the structure isin the ignition switch is turned off, can keep the stored data. Even if the battery is disconnected with the system, because of the use of electrically erasable programmable read-only memory and battery support system, mileage data can also maintain the integrity. The electrically erasableprogrammable read-only memory can write or erase the number of data is limited, the design foreach driving mileage data update. |
