Vehicles brake system today has already go far beyond the simple way that a driver presses the brake pedal and then the vehicle decelerates under the friction of brake pads and brake discs. Brake booster, brake anti-lock, body stability, and the emerging of advanced driving assistance greatly simplify the brake operation technology required to the drivers. Once there is something wrong to the brake system, a notice will be prompt to the drivers. All of these are in close relation to the application of sensors in the braking system. Today, let’s have a look at the roles that the main sensors play in the braking system.
Monitor the wear to brake pads
Right close to the backing plate of the front brake pads, the friction material is connected to a cable attaching with a connector. There are two wires inside the cable and they are interconnected at the end to the brake plate. The control unit supplies power to them through the wheel speed sensor and monitors the resistance of the wires. When the friction material wears to its extreme, the wires will be exposed and worn off to be detected as open circuits (resistance is infinite) by the control unit. Then the dashboard will prompt brake alarms.
Wheel speed sensor
The wheel speed sensor works to monitor the wheel speed in real time, as the data reference of ABS pump that is distributing brake forces to each wheel. By reading the signal from the wheel speed sensor, the ABS pump can tell the speed difference of the wheels and make adjustment of the brake force to each individual brake wheel cylinder. Once the ABS pump feels that one wheel speed is abnormal (obviously faster or slower than others), it will amplify or abate the brake force on this wheel to avoid brake deviation or brake lock.
Brake fluid level sensor
In the brake system of modern cars, brake fluid transmits the drivers’ pressing force on brake pedals to the brake cylinders of four wheels. Sufficient brake fluid in brake hoses is the important premise that hydraulic power can push the pistons of brake wheel cylinders effectively. The brake fluid tank is positioned on top of hydraulic brake hoses, with a fluid level sensor that can make use of the conductivity of brake fluid to transmit signals. When the fluid level drops, the electrodes of the sensor will be exposed in the air, failing to be conductive, and then alarms will be prompted on the dash board.
Advanced electronic technology enables the vehicles nowadays more intelligent and more secure, and many vehicles are equipped with self-adaptable cruise control (ACC) and automatic emergency brake (AEB). Those driving assisting functions make autos autonomous braking come true. Lidar, millimeter-wave radar or ultrasonic wave radar installed on front bumpers of vehicles can detect the distance between vehicles and the obstacles ahead. Electronic equipment however is hardly to be free of break-down. When something goes wrong with those radars, vehicles dashboard will show a warning sign of ACC failure etc.
Brake disc temperature sensor
Brake force will decline due to the overheating of brake pads and brake discs. Some high-performance vehicles or vehicles with modifications are used to equipping with brake-disc-temperature-sensors to tell the temperature of the brake system. This is a non-contact temperature sensor converting the heat radiation received into temperature showing to the drivers. One more advanced application of this temperature signal is to drive the wind-plate motor at the brake vents to control the cooling air volume, getting the brake discs to heat up quickly to normal working temperature, or increasing cooling air volume at overheating.
Brake signal sensor
It is well known to drivers of automatic transmission vehicles that brake pedals should be stepped down when the gear is switched from P to R. And then the brake light switch (left) will be turned on, and the electrical signal that lights up the brake lights will be transmitted to both the engine and the transmission as an activating signal. Some vehicle engines can only start after reading this signal, and the automatic transmission can only be able to hang in R gear after receiving this signal. In other cases, a few vehicle models substitute a break pressure sensor (right) for the brake light signal. Once there is any problem to the sensors above, the gears of the vehicles will not be able to transfer from P to R, and the engine will show abnormal at starting.
In addition, some other parts such as ABS pumps, or parking brake motors etc., also bear the function of self-diagnose, and once there is something wrong with them, alarms will be prompt on the dashboard or the central console.
Our company’s expertise includes skillfully blending new homes amongst established ones. The Remodel team knows the importance of keeping the process simple and worry-free, and they work closely with clients to custom tailor each home. Remodel provides the highest quality experience and materials, but knows that true luxury is found in everyday real living–sharing life with the people that matter most.