The working principle and application of common automobile speed sensors
2024/01/19
Car speedSensorIt can be said that the application in the automotive industry is quite extensive. Below we will introduce the basic principles and practical applications of 7 common automotive speed sensors.
(1) Magnetoelectric Vehicle Speed Sensor-Analog ACsignal generator, Generate an alternating current signal, usually composed of a magnetic core with two terminals and a coil. Each gear on the magnetic set wheel will produce a one-to-one series of pulses, the shape of which is the same. The amplitude of the output signal is proportional to the speed of the magnetic group wheel (vehicle speed), and the frequency of the signal is expressed in the speed of the magnetic group wheel. The engine control computer or ignition module relies on this synchronous pulse signal to determine the trigger time or fuel injection time.
(2) Hall-type vehicle speed sensors-they are mainly used in crankshaft angle and camshaft position, used to switch ignition and fuel injection circuit trigger, it is also used in other computer circuits that need to control the position and speed of rotating parts. It consists of an almost completely closed magnetic circuit containing permanent magnets and pole parts. A soft magnet vane rotor passes through the air gap between the magnets and the poles. The window on the vane rotor allows the magnetic field to pass unaffected and reach the Hall effect sensor. The part without the window interrupts the magnetic field.
(3) Photoelectric vehicle speed sensor-consists of a turntable with holes, two optical conductor fibers, a light-emitting diode, and a phototransistor as a light sensor. A phototransistor-based amplifier provides a signal of sufficient power to the engine control computer or ignition module. The phototransistor and amplifier produce a digital output signal (switching pulse). The light-emitting diode shines through the hole on the turntable to the photodiode to realize the transmission and reception of light.
(4) Engine speed sensor-detects the engine speed, usually using the crankshaft position sensor to detect the engine speed and output to achieve. Used for fuel injection volume, ignition advance angle, power transmission control, etc;
(5) Vehicle speed sensor-usually obtained by directly or indirectly detecting the speed of the car tires, mainly reflected in the fact that we can know our own form of speed when the car is running.
(6) Wheel speed sensor-detects the wheel speed and outputs the detection result to the ECU, which is mainly used in the two aspects of car braking control and drive control;
(7) Deceleration sensor-Its main purpose is to detect the deceleration speed of the car when it is decelerating, and also to send this signal back to the ECU, the control of the car's braking and drive control.
2024-01-19
The unity of man and nature, Longxian all over the world, Cathay Pacific has a dream, poly rice into a mountain. Golden dog Nafu, the road to prosperity and revitalization of the exhibition hometown. In the prosperous age of wealth, sing the song of Tianlong and Tami's brilliant harmony. On January 27, 2018, in the beautiful town of Changhua in western Zhejiang, we welcomed the 2018 annual meeting and advanced commendation meeting of tianlong electronics & timi technology co., ltd. At this moment of toasting, Mr. Yang Lijiang, chairman of the company, brought a congratulatory speech to everyone. Looking back on the past and looking forward to the future, every word and sentence of Yang Zong inspires all the Tianlong and Tami people present to get together, set out again, set out together, move forward for the dream, reach the peak, and then
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