12141438082 Camshaft Sensor for BMW 1 3 5 7 X3 X5 Z4
One of the characteristics of automotive technology development is that more and more components are electronically controlled. According to the role of the sensor, it can be classified into functions of measuring temperature, pressure, flow, position, gas concentration, speed, brightness, dry humidity, distance, etc.
Automotive sensor (4 photos)
Sensors, each of which performs its own duties. Once a sensor fails, the corresponding device will work abnormally or not. Therefore, the role of the sensor in the car is very important.
Automotive sensors used to be used exclusively on engines and have been extended to chassis, body and lighting electrical systems. These systems use more than 100 sensors. Among the wide variety of sensors, common ones are:
Intake pressure sensor: reflects the change in the absolute pressure within the intake manifold, and provides a reference signal for calculating the fuel injection duration to the ECU (engine electronic control unit);
Air flow meter: measures the amount of air sucked by the engine and provides it to the ECU as a reference signal for the injection time;
Throttle position sensor: measures the angle at which the throttle is opened, and provides the ECU as a reference signal for oil cut, fuel/air ratio control, and ignition advance angle correction;
Crankshaft position sensor: detects the crankshaft and engine speed, and provides it to the ECU as a reference signal for determining the ignition timing and the working sequence;
Oxygen sensor: detects the concentration of oxygen in the exhaust gas and supplies it to the ECU as a reference signal for controlling the fuel/air ratio near an optimum value (theoretical value);
Intake air temperature sensor: detects the intake air temperature and provides it to the ECU as a calculation of air density.
in accordance with;
Coolant temperature sensor: detects the temperature of the coolant and provides engine temperature information to the ECU;
Knock sensor: Installed on the cylinder to specifically detect the deflagration of the engine, and provide the ECU with the ignition advance angle adjusted according to the signal.
These sensors are primarily used in transmissions, steering gears, suspensions and ABS.
Transmission: There are vehicle speed sensor, temperature sensor, shaft speed sensor, pressure sensor, etc. The direction gear has a rotation angle sensor, a torque sensor, and a hydraulic sensor;
Suspension: There are vehicle speed sensor, acceleration sensor, body height sensor, roll angle sensor, angle sensor, etc.
Beside the brake piston (the caliper of the brake disc, inside is the brake piston), ABS work is to ensure that the brake piston and brake disc are not stuck, to ensure that they are on the edge of sliding friction and static friction. Most of them are monitored by an inductive sensor. The abs sensor outputs a set of quasi-sinusoidal AC signals through the action of a ring gear that rotates synchronously with the wheel. The frequency and amplitude are related to the wheel speed. The output signal is transmitted to the ABS electronic control unit (ECU). ), real-time monitoring of wheel speed.