Is the signal voltage of the car s electronically controlled engine sensor all 5V?

Not all sensors are 5V, sensors are active and passive, such as crankshaft position sensor, knock sensor is passive, water temperature sensor, intake air temperature sensor, camshaft position sensor is 5V power supply, but such as ** air flow meter, oxygen sensor.

The throttle valve needs 12V, and the specific sensor is analyzed specifically, if it helps you.

sensors, which need to realize the transmission of information between the transmission computer and the engine computer, this work is usually carried out by. 3) With a few exceptions, all automotive computers use a 5V power supply to drive their sensors.

The biggest difference between an electronically controlled engine and a carburetor engine is the fuel supply system. The fuel supply system of the electronically controlled engine has eliminated the carburetor, but a number of electronic automatic control devices have been added. These include many sensors, actuators, and ECUs.

Electronically controlled engines have to do not only what carburetors do, but also what carburetors can't do. For example, the specific concentration of air-fuel in a combustible mixture can be controlled within the required range. The oil circuit and circuit of the carburetor engine are very clearly divided and do not affect each other much.

The electronically controlled engine fuel supply system increases the electronic control part, which makes the oil circuit and circuit interconnected, which not only affects the work of the engine fuel system, but also affects the normal operation of the engine. Due to the increase in electronic control devices for electronically controlled engines, this makes the entire structure of the engine, including the electronic control system, more complex.

Fast. Navigation.

Structural composition. How it works.

Parameters to be measured. Merit.

Basic idea. In the initial stage, the function of the system is realized by replacing the mechanical control technology with electronic technology, and its function is expanded, so that the performance is greatly improved; After the development to a certain extent, electronic technology can promote the essential change of the system principle, so that the limitations can be broken through, so that the engine performance can be greatly improved.

Electronically controlled engine.

Structural composition. Electronic control unit.

The electronic control unit (ECU) is the heart of the engine's electronic control system. It completes the collection of various parameters of the engine, the control of fuel injection volume and fuel injection timing, and determines the function of the entire electronic control system.

Sensor. Sensors transmit information about engine conditions and environment to the ECU in real time and realistically through various signals.

In other words, what the ECU learns is just an engine made up of many signals. Therefore, the accuracy, reproducibility and immediacy of sensor information directly determine the quality of control.

Actuators. The various control functions to be completed by the electronic control system are realized by various actuators.

In the control process, the actuator converts the control signal from the ECU into a certain mechanical motion or electrical movement, thereby causing the change of engine operating parameters and completing the control function.

How it works. The engine speed and load are used as the basic signals reflecting the actual working conditions of the engine, and the basic fuel injection amount and fuel injection timing are determined with reference to the fuel injection amount and fuel injection timing spectrum corresponding to each working condition of the engine obtained by the test, and then various compensation is made according to various factors (such as water temperature, oil temperature, atmospheric pressure, etc.), so as to obtain the best fuel injection amount and fuel injection timing or ignition timing, and then control the output through the actuator.

Today's engines use electronic control systems, which are mainly composed of various sensors, electronic control units (ECUs), and actuators. The control system is mainly divided into five aspects: air intake system, fuel system, ignition system, idle system and emission control system.

The schematic diagram of its composition is as follows. Among them, the main sensors of the engine (9) include: air flow sensor (MAF), throttle position sensor (TPS), accelerator pedal position sensor (ETPS), intake air temperature sensor (MAT), coolant temperature sensor (ECT), camshaft position sensor (CMP), crankshaft position sensor (CKP), oxygen sensor, knock sensor (KS).

Crankshaft position, camshaft position, knock sensor, throttle opening, speed, intake flow, intake temperature, intake pressure, exhaust oxygen sensor, water temperature (some models have more), some sensors can be saved, but only by the crankshaft position and camshaft position sensor can make the engine run, but the engine condition at this time is not very stable.

There is a crankshaft position sensor. Camshaft Position Sensor, Throttle Position Sensor, Water Temperature Sensor, Deflagration Sensor, ECM, Injector. Hydraulic regulator, ignition coil, fire plug.

The main sensors of the engine are: air flow sensor, throttle position sensor, accelerator pedal position sensor, air temperature sensor, coolant temperature sensor, camshaft position sensor, crankshaft position ruler sensor, oxygen sensing normal, knock sensor, etc. Lingqingheng engine sensor control system is the core of the entire automotive sensor.

1. Intake manifold temperature and pressure sensor: reflects the change of absolute pressure in the intake manifold, and provides a reference signal to the ECU (engine electronic control unit) to calculate the duration of fuel injection;

2. Air flow sensor: measure the amount of air inhaled by the engine, and provide it to the ECU as a reference signal for the injection time;

3. Oil pressure sensor: monitor whether the oil pressure is normal when the engine is running.

4. Crankshaft position sensor: detect the crankshaft and engine speed, and provide it to ECU as a reference signal to determine the ignition timing and working sequence;

5. Camshaft position sensor: collect the camshaft moving angle signal and input it into the electronic control unit (ECU) in order to determine the ignition time and fuel injection time.

6. Oxygen sensor: detect the oxygen concentration in the exhaust gas, and provide ECU as a reference signal to control the fuel-air ratio near the optimal value (theoretical value);

7. Inlet air temperature and pressure sensor: detect the inlet air temperature and provide it to ECU as the basis for calculating air density;

8. Detonation sensor: It is installed on the cylinder block to detect the detonation condition of the engine, and provides it to the ECU to adjust the ignition advance angle according to the signal.

9. Water temperature sensor: used to measure the coolant temperature of the engine and provide engine water temperature information to the ECU.

The normal voltage is around volts.

Sensors are standard in cars and utilize the Nernst principle. It is a measuring element that uses a ceramic sensitive element to measure the oxygen potential in the exhaust pipe of the automobile, and calculates the corresponding oxygen concentration by the principle of chemical equilibrium, so as to monitor and control the combustion air-fuel ratio to ensure product quality and exhaust emission standards.

It has the advantages of simple structure, quick response, easy maintenance, convenient use and accurate measurement. The ECU determines whether the air-fuel ratio is low or high based on the difference in electromotive force from the oxygen sensor and controls the duration of the injection accordingly.

How it works. The oil pressure sensor is installed on the main oil duct of the engine, when the engine is running, the pressure measuring device detects the pressure of the oil, converts the pressure signal into an electrical signal and sends it to the signal processing circuit, after voltage amplification and current amplification, the amplified pressure signal is connected to the oil pressure indicator through the signal line, and the ratio of the current passed by the two coils inside the oil pressure indicator is changed.

This indicates the oil pressure of the engine. After voltage amplification and current amplification of the pressure signal, but also compared with the alarm voltage set in the alarm circuit, when lower than the alarm voltage, the alarm circuit will output the alarm signal, and the alarm light is lit through the alarm line.

The wiring mode of the electronic oil pressure sensor is completely consistent with the traditional mechanical sensor, which can replace the mechanical pressure sensor, and is directly connected with the automobile oil pressure indicator gauge and the low-pressure alarm lamp, indicating the oil pressure of the diesel automobile engine and providing the low-pressure alarm signal.

Compared with the traditional piezoresistive oil pressure sensor, the electronic automotive oil pressure sensor has the advantages of no mechanical moving parts (i.e., no contact), high accuracy, high reliability, long life, etc., and meets the requirements of automotive electronic development.

There are mainly air flow sensors (or intake pressure sensors, intake air temperature sensors), coolant temperature sensors, throttle position sensors, engine speed sensors, vehicle speed sensors, crankshaft (or camshaft) position sensors, oxygen sensors, knock sensors, etc. The signal voltage of the sensor is generally 5V or, and the supply voltage is 12V.

1. The sensor voltage on the car is generally determined by the voltage of the car battery.

2. For most cars, the battery voltage is 12V, so the sensor is 12V for power supply.

3. Most of the trucks are 24V, so the sensors used in trucks are mostly 24V power supply.

How many volts is the voltage of the signal foot of the high-voltage sensor.

It depends on what kind of car, the big truck is 24 volts, and the small car is 12 volts.

Intake pressure sensor: reflects the change in the absolute pressure in the intake manifold and provides a reference signal to the ECU (engine electronic control unit) to calculate the duration of fuel injection;

Air Flow Sensor: Measure the amount of air drawn in by the engine and provide it to the ECU as a reference signal for the injection time;

Throttle position sensor: measure the angle of throttle opening, and provide ECU as a reference signal for oil cut-off, control of fuel-air ratio, and ignition advance angle correction;

Crankshaft angle sensor: detects the crankshaft and engine speed, and provides it to the ECU as a reference signal to determine the ignition timing and working sequence;

Oxygen sensor: detects the oxygen concentration in the exhaust gas and provides it to the ECU as a reference signal to control the fuel-to-air ratio near the optimal value (theoretical value);

Inlet air temperature sensor: detect the inlet air temperature and provide it to the ECU as the basis for calculating the air density;

Water temperature sensor: detects the temperature of the coolant and provides engine temperature information to the ECU;

Deflagration sensor: Installed on the cylinder block to detect the deflagration status of the engine, and provide the ECU to adjust the ignition advance angle according to the signal.