Camshaft position sensor, also known as the cylinder identification sensor, camshaft position sensors are generally expressed by CIS. Camshaft position sensor function is to collect the valve camshaft position signal, and input ECU, in order to identify the ECU compression TDC cylinder 1, thereby performing sequential fuel injection control, ignition timing control and knock control.
Cooling Temperature Sensor
2013年9月24日星期二
How the sensor application circuit reduces noise and interference
Sensor circuit sensor circuit noise and interference sources easily received outside or inside some of the irregular noise or interference signal , in fact, the success Engine Water Temperature Sensor design and interference design are inseparable.A low-frequency noiseLow-frequency noise is mainly due to internal discontinuities caused by the conductive particles . In particular carbon film resistors, the carbonaceous material is present inside many small particles , particles are not continuous, the current flows through the resistor will change in conductivity caused by the current changes, resulting in poor contact of a similar arc flash explosion . In addition , the transistor may also have a similar burst noise and flicker noise , and the resistance mechanism which generates discontinuity of particles similar to , but also the degree of doping of the transistor .2 semiconductor device generates shot noisBecause the semiconductor PN junction voltage Crank Shaft Sensor the potential barrier region caused by changes in the cumulative amount of charge in this region changes, which show a capacitive effect . When the applied forward voltage rises , N and P areas of electronic devices in the depletion region of the hole movement , is equivalent to charging the capacitor . When the forward voltage decreases , which in turn make the depletion region away from the electron and hole , the equivalent capacitor is discharged. When the applied reverse voltage, the depletion region opposite variation . When the current flows through the potential barrier region , this change will cause flow through the potential barrier region small fluctuations generated by the current , thereby generating current noise. Its size and noise temperature , △ f is proportional to the bandwidth .3 high-frequency thermal noiseHigh-frequency thermal noise is due to the internal conductor random motion of electrons generated . The higher the temperature , the more intense electron motion . No internal electronic conductor Games in its internal rules the formation of many small current fluctuations , because it is disorderly movement , so its average total current is zero , but it as a component ( or as part of the circuit ) is connected enlarge circuit , its internal current source will be enlarged to a noise , especially in the high frequency band of the work circuit of high frequency noise particularly .
订阅:
博文评论 (Atom)
没有评论:
发表评论