The combined sensor is mounted on the left side of the parking brake lever (left hand drive models) or on the right side of the parking brake lever (right hand drive models) and determines the angular velocity of the vehicle's yaw (angular velocity of a car in a turn) and longitudinal acceleration. The sensor transmits a signal to the DSC HU/CM system.
The output voltage of the combined sensor (2.5 V when the vehicle is stationary) changes according to the yaw rate and longitudinal acceleration value.
The yaw rate is determined when the sensor detects a Coriolis force proportional to the rotational speed.
The magnitude of longitudinal acceleration is determined when the sensor detects an inertial force proportional to the longitudinal acceleration acting on the silicon sensing element.
Note.
Coriolis force. When an object placed on a rotating disk moves toward its center, a force is generated that is directed at a right angle to the path of the object's movement. This causes the direction of the object's movement to remain unchanged relative to its starting point, and the object does not reach the center. This force that deflects the object from the center is called the Coriolis force, and the actual movement of the object is rectilinear.
Fig. 6.3. Assembly diagram of the ABS/TCS system of the brake circuit of the Mazda 3 vehicle: 1 – IG switch; 2 – SUS 10 a (fuse box); 3 – anti-lock braking system 20 A and 30 A (fuses and fuses); 4 – instrument cluster; 5 – Anti-lock braking system warning light; 6 – brake system warning light; 7 – CAN driver; 8 – actuator of the automatic speed control system; 9 – ABS control unit; 10 – Anti-lock braking system wheel speed sensors; 11 – battery
(The article is reprinted from the portal mazbook.ru)
Fig. 6.4. Operation diagram of the DSC HU/CM system of the PCM unit of the Mazda 3 vehicle: 1 – wheel speed sensor; 2 – sensor rotor; 3 – steering angle sensor; 4 – DSC system indicator lamp; 5 – DSC system deactivation indicator lamp; 6 – brake system warning light; 7 – Anti-lock braking system warning light; 8 – combined sensor; 9 - audio unit, windscreen wiper and windscreen washer, automatic speed control system actuator, windscreen washer switch, car navigation and alignment control unit; 10 – master cylinder; 11 – electrical signal; 12 – brake fluid; 13 – CAN line
Fig. 6.5. Assembly diagram of the DSC system of the brake circuit of the Mazda 3 vehicle: 1 – IG switch; 2 – SUS 10 a (fuse box); 3 – anti-lock braking system 20 A and 30 A (fuses and fuses); 4 – instrument cluster; 5 – Anti-lock braking system warning light; 6 – brake system warning light; 7 – CAN driver; 8 – actuator of the automatic speed control system; 9 – DSC system control unit; 10 – Anti-lock braking system wheel speed sensors; 11 – battery; 12 – steering wheel angle sensor; 13 – CAN controller combined sensor; 14 – DSC system switch; 15 – DSC system deactivation indicator lamp; 16 – DSC control lamp