Otis Singleton
The electronic parking brake (EPB) is a relatively new feature in modern vehicles, although it was first introduced in the Lancia Thesis in 2001. An EPB can be activated by the driver with a button, and the brake pads are electrically applied to the rear wheels. The implementation of the control logic for the actuators is carried out by either using a stand-alone ECU or by integrating it into the ECU for electronic stability control. There are two types of EPB configurations, both of which actuate conventional parking brake mechanisms. Type 1 uses an electric motor and mechanical actuator mechanism mounted to the body of the vehicle, while Type 2 uses a motor and gear train attached to the rear caliper parking actuator.
| Characteristics | Values |
|---|---|
| Name | Electronic Parking Brake (EPB) |
| Other Names | Electric Parking Brake, Electric Park Brake, Electronic Park Brake, Electric Handbrake |
| Function | Parking Brake, Anti-Theft Deterrent |
| Components | Actuating Button, Control Unit, Antilock Braking System (ABS), Sensors (Clutch and Accelerator), Servomotors/Electric Motors, Rear Brake Elements |
| Mechanism | Cable Puller Systems, Caliper Integrated Systems |
| Configuration | Type 1 (Electric Motor and Mechanical Actuator Mechanism), Type 2 (Motor and Gear Train Attached to Rear Caliper Parking Actuator) |
| Control | Electronic Control Unit (ECU), Anti-Lock Brake System (ABS), Controller Area Network (CAN) Bus |
| Activation | Press or Pull Button, Automatic Release When Vehicle is in Gear |
| Safety | Automatic Emergency Braking, Anti-Lock Braking System (ABS) |
| Advantages | Easy to Use, Multi-Purpose, Automatic Release, Hill-Holding Feature |
| Disadvantages | Complex, Expensive Repairs, Dependent on Electronic Power |
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What You'll Learn
- The driver activates the holding mechanism with a button
- The brake pads are electrically applied to the rear wheels
- The implementation of the control logic for the actuators
- The electric motor applies the shoes in the drum hat of the rear disc brake
- The hill-holding feature is incorporated into the Electronic Stability Control (ESC)
The driver activates the holding mechanism with a button
The driver can activate the holding mechanism of an electronic parking brake (EPB) with the press of a button. This is a relatively new feature in modern vehicles, with the first EPB being introduced in the 2001 Lancia Thesis.
The electronic parking brake button is typically located within reach of the driver. When the button is pressed, a signal is sent to the electronic control unit (ECU) and the actuator mechanism. The ECU and actuator mechanism then work together to apply the brake pads to the rear wheels, safely holding the vehicle in place. This is achieved through the rotation of the electric motor, which is transmitted to a gear mechanism by a belt. The gear mechanism then reduces the rotational speed and converts the rotational movement to thrust, pushing the brake piston to the pads and the brakes to the discs.
The EPB system also provides additional functions, such as automatic release when the driver presses the accelerator or slips the clutch, and re-clamping with additional force if vehicle motion is detected. This automatic release can be particularly useful when the vehicle is on an incline, as the system can maintain braking until the driver has released the brake pedal and the vehicle moves forward.
The EPB system is designed with safety in mind. For example, if the EPB is activated while the vehicle is in motion, the anti-lock braking system (ABS) is engaged, slowing down or stopping the vehicle. Additionally, warning lamps are in place to indicate when the EPB is activated, when there is a fault in the system, and when the hill-start assist system is active.
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The brake pads are electrically applied to the rear wheels
The ECU plays a crucial role in the EPB system by receiving signals from various sensors and processing the information to control the braking system. For example, it may receive information from the clutch position sensor, accelerator sensor, and other vehicle units. This allows the ECU to make necessary adjustments to achieve the optimum braking level.
The actuator mechanism is responsible for physically applying the brake pads to the rear wheels. There are two main types of actuator mechanisms: cable puller systems and caliper integrated systems. The cable puller system uses an electric motor to tug on the parking brake cables, which then engage the rear brakes. This type of system has been known to have issues with seized cables.
The caliper integrated system, on the other hand, uses switch-activated motors to apply and release the rear brake calipers directly. This system eliminates the need for cables, making it more reliable and efficient. The actuator motor is mounted directly on the rear brake caliper, allowing for precise control of the braking force.
In both types of systems, the electric motor plays a key role in generating the force required to apply the brake pads to the rear wheels. The motor's rotation is transmitted to a gear mechanism, which reduces the rotational speed and converts it into linear motion, pushing the brake piston and pads towards the discs. This process ensures that the vehicle remains stationary, even on slopes, by preventing the wheels from turning.
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The implementation of the control logic for the actuators
There are two main types of EPB configurations. Type 1 features an electric motor and mechanical actuator mechanism mounted to the body of the vehicle. The actuator is connected to the cables for the rear drum-in-hat brake shoes or the caliper parking brake mechanism. When activated, the actuator retracts the cables attached to the caliper or shoe mechanism. Type 2 uses a motor and gear train attached to the rear caliper parking actuator, eliminating the need for cables and requiring only one electrical and one hydraulic connection at the caliper.
The EPB system can be activated manually by the driver or automatically when the vehicle is parked and locked. When activated, a reference voltage is sent back to the ABS module, which then sends power and ground to the parking brake actuator motors. The ABS module also assures that conditions are correct for EPB actuation, monitoring and controlling the system. Once the parking brakes are fully applied, the ABS module sends a message to the IPC, illuminating a warning indicator.
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The electric motor applies the shoes in the drum hat of the rear disc brake
An electric parking brake (EPB) is a system that allows drivers to engage and disengage their parking brake with the simple press of a button. This system eliminates the need for a traditional handbrake lever and provides a more convenient and ergonomic solution for the driver. In this specific design, the electric parking brake utilizes an electric motor to activate the rear disc brake, ensuring the vehicle is securely held in place when parked.
When the driver activates the electric parking brake by pressing the button, a signal is sent to the EPB control module, which then activates the electric motor. This motor is precisely positioned near the rear disc brake assembly, ensuring a direct and efficient application of the parking brake. The motor's primary function is to engage the brake shoes within the drum hat of the rear disc brake.
The drum hat is a unique feature of the rear disc brake design, combining the benefits of both drum and disc brake systems. It consists of a small drum-shaped structure integrated into the center of the disc brake rotor. Inside this drum hat are the brake shoes, which are connected to the electric motor via a series of mechanical linkages and levers.
As the electric motor receives the signal from the EPB control module, it engages the mechanical components connected to the brake shoes. Through a series of gears and linkages, the motor's rotational motion is converted into linear motion, allowing the brake shoes to move outwardly within the drum hat. This movement ensures that the friction material of the brake shoes comes into direct contact with the inner surface of the drum hat, generating the necessary friction to hold the vehicle stationary.
By controlling the force applied to the brake shoes, the electric motor plays a crucial role in providing the required braking force to immobilize the vehicle. This precise control ensures that the parking brake is engaged effectively without exerting excessive force on the brake components. The combination of the electric motor's actuation and the drum hat's design results in a secure and reliable parking brake system.
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The hill-holding feature is incorporated into the Electronic Stability Control (ESC)
The hill-holding feature is an essential safety mechanism in modern cars, preventing vehicles from rolling backward when starting on an incline. This feature is incorporated into the Electronic Stability Control (ESC) system, which uses sensor information from the Controller Area Network (CAN) bus to determine the necessary brake power to hold the vehicle in place.
The hill-holding feature in the ESC system relies on several sensors to gather information about the vehicle's position and the incline of the slope. Angle or incline sensors measure the steepness of the hill, while pressure sensors determine the weight of the vehicle, including passengers and cargo. Torque sensors also play a role by measuring the rotational force generated by the engine and transferred to the wheels. These sensors work together to provide critical data to the Electronic Control Unit (ECU), which then adjusts the brake power to prevent rollback.
The ECU is a crucial component in the hill-holding feature, receiving and processing information from various sensors. It uses this data to calculate the necessary brake power to hold the vehicle on an incline. The ECU is connected to the brake actuator, which applies the brakes accordingly. The ECU's ability to process sensor data and control the brake actuator ensures that the vehicle remains stationary, even on steep inclines.
In addition to the sensors mentioned, clutch and accelerator sensors also play a role in the hill-holding feature. These sensors send information to the ECU, allowing it to monitor the driver's actions and adjust the braking system accordingly. For example, when the driver releases the brake and applies the accelerator, the ECU ensures that the brake pressure is maintained for a few extra seconds to prevent rollback.
The hill-holding feature in the ESC system offers significant advantages, particularly for novice drivers or those navigating challenging terrain. By preventing rollback on inclines, it enhances safety for the driver and the traffic behind them. Additionally, it simplifies the driving experience, allowing drivers to smoothly transition from the brake to the accelerator without the worry of rolling backward. Overall, the integration of the hill-holding feature into the ESC system contributes to a more comfortable and controlled driving experience, especially when navigating hilly or sloping roads.
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Frequently asked questions
Type 1 electric parking brake systems use an electric motor and mechanical actuator mechanism mounted to the body of the vehicle. The actuator is connected to the cables for the rear drum-in-hat brake shoes or caliper parking brake mechanism. When the parking brake actuator is activated, the actuator retracts the cables attached to the caliper or the shoe mechanism.
Type 2 systems use a motor and gear train attached to the rear caliper parking actuator. This eliminates the cables used to actuate the parking brake in Type 1 systems, making one electrical and one hydraulic connection at the caliper.
The driver activates the holding mechanism with a button, and the brake pads are electrically applied to the rear wheels. This is accomplished by an electronic control unit (ECU) and an actuator mechanism.
The ECU receives the EPB actuation signal (manual or automatic) and processes it to send the information to the braking system.
When the signal comes, the working electric motor rotates, transmitting this rotational movement to a gear mechanism via a belt. This gear mechanism reduces the rotational speed and converts the rotational movement to thrust, pushing the brake piston to the pads and brakes to the discs.
