Electronic Parking Brake lever on Hyundai Santa Fe – (photo by Hyundai)
The electronic park brake replaces the mechanical park brake in the automotive industry.
With the conventional park brake, the driver activates a mechanical device with his foot or hand, which generates a locking force on the raise brake system via cables. The operator generates an individual mechanical force with an propulsion unit ( hand or foot operated ). This is transmitted to the rear brake system via mechanical cables. hera a force out is exerted on the brake disk or drum. In the case of very heavy vehicles, a distinguish barrel brake is much used in order to achieve the necessary bear forces.
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Manual handbrake on 2002 Hyundai Sonata – (photo by Hyundai)
Three systems are presently available for the electronic parking brake. What they all have in park is the successor of the mechanical manoeuver lever with an electrically switching operating unit of measurement .
Cable Puller System
An actuator ( motor-gearbox unit, normally with an integrate electronic manipulate ) tensions the mechanical cables, which then generate the tensioning power in the rear brake system as with the conventional park brake. The advantage of this system is that the EPB can be integrated into an existing vehicle social organization, since the initiation space can be freely selected and this arrangement works with both barrel and disk brakes.
Motor on Caliper System
This is a system in which extra modest motor-gear units ( besides called send actuators ) mounted directly on the brake caliper actuate the brake pistons of the buttocks brake calipers and frankincense generate the necessity interlock force. There are no more cables in this arrangement. The system is very easy to integrate into a vehicle, but merely works with magnetic disk brakes .
Electric drum brake
This system is used for identical heavy vehicles. A motor-gear whole activates a freestanding barrel brake that generates the clamping force. With this arrangement there are no longer any cables.
How it works
The electronic parking brake is another dance step towards the implementation of a amply electronic brake system. With their aid, it is possible to implement extra quilt functions, such as assist starting on the batch. This function can besides be made possible by other driver aid systems.
A handbrake lever or handle including Bowden cable, which is normally located in the center cabinet of a vehicle, is wholly dispensed with. The EPB is operated via a button and frankincense opens up new possibilities for vehicle manufacturers in the design of the inside .
Benefits and advanced features
Vehicle interior design:
- Replacement of the hand lever with a freely configurable electrical control unit, the vehicle interior can be designed individually.
- More free space for the center console.
2021 Volkswagen Golf Alltrack sleek center console design with electronic parking brake – (photo by VW)
Redundant braking system (dynamic state) with additional fall-back levels:
- Actuation of the electronic parking brake while driving (safe dynamic deceleration over all four wheels).
- Very safe braking even in poor conditions.
- Automatic retensioning (hot brakes lead to a loss of clamping force with a mechanical parking brake, i.e. the braking force decreases in the cooling phase. The electronic parking brake compensates for the loss.)
- The vehicle is always parked with maximum clamping force (always safe – with a mechanical parking brake, the driver determines the holding force – incorrect operation due to insufficient braking force is excluded).
- Automatic release when moving off (drive away release – DAR).
- Automatic closing of the parking brake when the ignition key is removed.
- Auto-hold function (the parking brake is automatically activated when the vehicle is stationary).
- Additional function (prevents the vehicle from rolling away unintentionally).
- The cable EPB compensates for the wear on the brake linings, so maintenance is not required.
- Decoupling of the driver and the associated loss of control and function.
- Pull-in and release times at 1 second, which is slightly slower than a manual parking brake.
- Total failure of the function if the electrical power supply fails.
- Higher complexity.
- Costs, whereby the costs of the electronic parking brake are approaching those of the conventional handbrake more and more due to the increasing spread in the market.
- “Gentle” release not possible or dependent on programming, which makes starting on slippery surfaces very difficult.
- Systems that work with additional motor-gear units mounted directly on the brake caliper increase the unsprung mass on the affected wheels.
- Brake cannot be used to drift the vehicle.