What do the brake sensors of a car do

The brake sensor has two functions, one is to light the brake light to warn the rear car to prevent rear-end collision, and the other is to provide signals for ABS anti-lock braking system, brake force distribution system, brake assist system, etc.

Where is the brake sensor, you can only open the electrical installation diagram of your car to see where it is. Because there are many types and models of sensors, and there are contact and non-contact types of object rolling down sensors, as for the contact type, it is good to say that they are generally installed near the controlled object, but if it is a non-contact type, it is not necessarily installed near the controlled object, so you can only view the sensor you need according to the electrical installation drawing.

When pressing the brake pedal sharply.

, you will feel the pedals bouncing up rhythmically, and this is where ABS comes into play. Sometimes, however, we find that at low speeds, even if we press the brake pedal as fast as we do, we still don't feel like we are being pushed against the pedal. The reason is the ABS system.

There are two conditions for participating in the work response, one is the instant car cover speed before stepping on the brake pedal, and the other is the slip rate, the so-called slip rate is the ratio of (vehicle speed - wheel speed) vehicle speed.

The slip rate can be understood in this way, when the wheel speed = 0, the slip rate = 1, and the wheel is locked up (because the wheel speed is already 0). To a certain extent, the slip rate can reflect the urgency of braking.

These two parameters are recorded in the driving computer module (ECU), the parameter will set a speed limit before braking, if it is less than this speed, ABS does not participate in the braking response, and the locking at this time can not produce danger, the second parameter is this slip rate, according to the basic data given by each speed sensor, the size of the slip rate directly determines how ABS participates in the response, and there are three ways to respond: pressurization, pressure holding, and pressure reduction. Pressurization, pressure holding and pressure reduction are controlled by 8 solenoid valves in the ABS pump.

The electronic control unit is the control center of the ABS system, which is actually a microcomputer.

Therefore, it is often called ABS (ECU) computer. The ABS ECU consists of an input circuit, a digital controller, an output circuit, and a warning circuit. The main task is to continuously monitor and receive pulse signals from four wheel speed sensors.

And measurement and comparison, analysis amplification and discrimination processing, calculate the wheel speed, wheel deceleration and brake slip rate, and then carry out logical comparison and analysis of the braking situation of the four wheels, once the wheel is judged to be locked, it immediately enters the anti-lock control state, through the electronic control unit to the hydraulic unit to send instructions to control the brake wheel cylinder oil circuit solenoid valve on-off and hydraulic pump.

work to regulate the brake pressure and prevent the wheels from locking.

The sensor is broken, affecting driving. The specific effects are as follows:

1. The engine fault light is on;

2. When the vehicle slows down and stops during the start or driving of the land key, there is an instantaneous pause or stallion;

3. The acceleration performance of the engine decreases;

4. There is a deviation in the speed display on the instrument;

5. It will cause the engine to idle unsteadily.

The sensor is the input device of the automotive computer system, which converts the information of various working conditions (such as vehicle speed, temperature of various rapid noise media, engine working conditions, etc.). ) is converted into an electrical signal and transmitted to a computer, so that the engine is in ideal working condition. There are many sensors used in vehicles.

When judging the fault of the sensor, it is necessary to consider not only the sensor itself, but also the entire circuit where the failure of the mu hood occurs.

1. The engine fault light is on. 2. When the vehicle starts or slows down and stops, there is an instantaneous pause or flame-off. 3. The acceleration performance of the engine decreases. 4. There is a deviation in the speed display on the dashboard. 5. It will cause instability when the engine is idling.

Damage to the vehicle's sensors will cause the central control in the car to be unable to accept relevant vehicle information, resulting in the owner not being able to understand the vehicle condition in time for trembling or hazing during driving. The vehicle sensor is the input device of the automobile computer system, which converts the information of various working conditions in the operation of the car, such as vehicle speed, temperature of various media, engine operating conditions, etc., into electrical signals and transmits them to the computer, so that the engine is in the best working condition. A broken sensor behaves like this on the car:

1. The performance of the broken vehicle speed sensor: the vehicle speed sensing function is mainly to detect the speed of the electronically controlled car, and the control computer uses this input signal to control the engine idling, the torque lock of the automatic transmission, the automatic transmission shift and the opening and closing of the engine cooling fan and cruise control and other functions;

2. Symptoms of broken sensors in the vehicle speed group: engine instability when idling; When the vehicle starts or slows down and stops, there is an instantaneous pause or stallion; Reduced engine acceleration; There is a deviation in the speed display on the meter; The engine fault light is on;

3. The performance of the throttle position sensor is broken: if the throttle position sensor is out of tune, the correct ignition advance angle and the air-fuel ratio of the mixture cannot be guaranteed. The throttle position sensor should be accurately adjusted to the specified voltage reading, if the adjustment is too low, because the exhaust gas recirculation system does not provide enough exhaust gas in time, detonation will occur when accelerating, if the adjustment is too high, because the exhaust gas recirculation system reacts too fast, the exhaust gas provided is too much, so that the power is reduced;

4. The performance of the coolant temperature sensor is broken: if the coolant temperature sensor fails, the engine will have unstable idling, lack of fire, flameout or increased fuel consumption, etc., a multimeter should be used to check the resistance value of the coolant sensor at various working temperatures according to the manufacturer's regulations.

Photo by Q&A) Xpeng P7 Model Y Aion V Ideal One NIO EC6 Model X @2019

One brakes are thin and thick, and the other is a body stability system.

2.Unresponsive brakes: When you press the brake pedal and the brakes fail or do not respond, the brake sensor may be damaged.

3.Brake noise: Damaged brake sensors may cause rattling or screeching noises when braking.

If you encounter the above symptoms, it is recommended to go to a professional car repair station for inspection and repair in time. Brake is a necessary guarantee for vehicle driving safety, once there is a problem with the brake, it must be dealt with in time to ensure safe driving.

1.Brake warning light on: This is one of the most common symptoms, and when the brake warning light is solid or flashing, it is likely that there is a problem with the sensor.

2.Excessive wear of brake wheels: When the brakes are not used properly, the degree of wear of the brake holes and wheel pads may be relatively large, which is because the brake sensor does not remind the owner to replace the brake pads in time.

3.The Brake Emergency Braking System (EBS) is not working properly: When the vehicle's EBS system is not working, it may be caused by a faulty sensor, and the vehicle will feel unstable when braking.

Therefore, if any of the above conditions are found, it is recommended to go to a professional car service center for inspection and repair in time.

Summary. Hello, dear, I'm honored to answer for you! <>

The brake sensor pro-brake sensor acts on the sensor type of the brake system, which helps the driver judge the wear of the brake pads, facilitates timely maintenance and ensures the normal and stable operation of the system. The working principle of brakes mainly comes from friction, using the friction between brake pads and brake discs (drums) and tires and the ground to convert the kinetic energy of the vehicle into heat energy after friction to stop the car. A good and efficient braking system must be able to provide stable, sufficient and controllable braking force, and have good hydraulic transmission and heat dissipation capacity to ensure that the force exerted by the driver from the brake pedal can be fully and effectively transmitted to the master cylinder and each sub-cylinder, and to avoid hydraulic failure and brake degradation caused by high heat.

Brake sensors.

Hello, dear, I'm honored to answer for you! <>

The brake sensor pro-brake sensor acts on the sensor type of the brake system, helping the driver to judge the wear of the brake pads, facilitating timely maintenance and ensuring the normal and stable rubber work of the system. The working principle of brakes mainly comes from friction, using the friction between brake pads and brake discs (drums) and tires and the ground to convert the kinetic energy of the vehicle into heat energy after friction to stop the car. A good and efficient braking system must be able to provide stable, sufficient and controllable braking force, and have good hydraulic transmission and heat dissipation capacity, including hands to ensure that the force exerted by the driver from the brake pedal can be fully and effectively transmitted to the master cylinder and each sub-cylinder, and to avoid hydraulic failure and brake decay caused by high heat.

A sensor is a device or device that can sense a specified physical quantity and convert it into a large input signal according to a certain law. To put it simply, a sensor is a device that converts non-electricity into electricity. Sensors are usually composed of the following three parts:

1) The sensitive element refers to the part that can directly feel (or respond) to be measured, that is, the sensitive element that is measured through the sensor is converted into a non-electric or other quantity that has a definite relationship with the measurement. (2) The conversion element converts the above-mentioned non-electric power into electrical parameters. (3) The function of the measurement circuit is to convert the electrical parameters input by the conversion element into measurable quantities such as voltage, current or frequency, and to display, record, control and process them.

When the pressure increases, the length of the diaphragm and the piezoresistive measuring bridge connected to it changes, and when the length changes, forces appear on the piezoelectric bridge elements in the measuring bridge, and these forces change the charge distribution in the piezoelectric element.

This automotive pressure sensor is the oil pressure control of Wanhe for braking system with hydraulic booster device, which can detect the pressure of the pressure reservoir, the closing or disconnecting signal of the oil pump and the abnormal alarm of oil pressure.

The change in pressure is detected by the metal diaphragm strain gauge, which is converted into an electrical signal and output to the outside world. WH136 pressure sensor is a special product that needs to be developed in the field of automotive applications, and is widely used in automobiles, oil pumps, refrigeration, air conditioning equipment and air compressors and other supporting fields.

Imported pressure measuring device is adopted, which is small in appearance and easy to install. Good electrical performance and long-term stability want to make it the first choice in the same industry, with CE certification, can directly replace a variety of similar imported products, such as Atlas, MSI, HUBA. And can customize the product shape and process connection mode according to user needs.

The above content reference: Encyclopedia - Automotive Pressure Sensor.