SG2007-2

Electrohydraulic Braking

Figure 1. Electrohydraulic Braking Block Diagram

MOTOROLA ORDERING INFORMATION

Contact your Motorola sales representative for complete information about existing products and custom solutions.

DESIGN CHALLENGES

Electrohydraulic braking is based on existing ABS systems with the addition of several enhancements. The inclusion of analog

electrohydraulic valves requires closed-loop, current-controlled pulse width modulation (PWM) outputs from the electronic control unit

(ECU).

An EHB system is required to incorporate a fail-safe state in the event of a fault occurring. To correctly initiate the fail-safe state, the

system relies on its electronic components to provide a high level of operational fault coverage.

MOTOROLA SOLUTION

An EHB system requires mid-range performance MPC500 microcontrollers for system control with SMARTMOS companion chips for

functions such as load driving, sensor interfacing, voltage regulation, and system watchdog operation.

Motorola has gained experience developing many of the specific aspects required for the implementation of an EHB system. Because

of its extensive experience in the development of fail-safe microcontrollers, braking-specific modules such as the wheel speed timer,

and a software center including drivers, tools, and operating systems, Motorola has proven its ability to develop the right solutions in

collaboration with its customers.

Part Number

Product Highlights

Additional Information

MPC500

32-bit microcontrollers

SMARTMOS

Integrated circuits

www.motorola.com/analog

NOTE: Search on the listed part number.

Hydraulic Brake Actuators

Pedal Sensor

Accumulator

Backup Valve

Hydraulic Pump

EHB Control Unit

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com