Electro-Hydraulic Components - MICO, Incorporated - #2

Electrohydraulic brake systems are the combination of electronics and hydraulics to create a more versatile brake system. The electronics provide control flexibility white the hydraulics supply the power.

Electrohydraulic braking offers many advantages over traditional hydraulic braking systems. These advantages can be exploited to provide improved system performance and greater comfort for the operator. Valves can be moved away from the cab and closer to the brakes - reducing plumbing costs. Remote operations are easily handled without having to duplicate the valving. Vehicle controls can be improved by implementing a variety of control schemes such as brake-by-wire systems, anti-lock brake systems, and traction control systems. These systems are a result of hydraulics and electronics combining to create brake systems that provide value added features for the machine operator.

A typical full power hydraulic brake system consists ol a pump with relief valve, an accumulator charge valve, accumulator, and a manually operated pressure modulating valve. Implementing electrohydraulic technology into a full power system requires installing an electronic pedal with pedal angle sensor, an electronic control unit, and an electrohydraulic modulating brake valve in place of the existing mechanical linkage and pressure modulating valve (See Figure 1 on page 4).

Simply speaking, the pedal angle sensor converts the pedal angle to an electrical signal that is an input to the electronic control unit. The electronic control unit is programmable to provide a current to the proportional solenoid of the valve. The spool in the valve fhen moves to modulate an output pressure that is proportional to the force from the solenoid.

Although this may seem like a complex way to convert pedal displacement into pressure, the programmability ot the electronic control unit allows system designers flexibility to vary the transfer function in ways that are difficult to do mechanically. Signals can also be shared with electronic engine controllers and/or tr; controllers for improved vehicle performance.

What are Electrohydraulic

Brake Systems..........................................Page 2

How do Electrohydraulic

Brake Systems work................................Page 2

What does MICO have to offer....................Page 3

Brake-by-Wire System.................................Page 4

Electronically Enhanced

Full Power Brake System..........................Page 4

Full Power Brake System

with ABS...................................................Page 5

Full Power Brake System

with Traciion Control..............................Page 5

Brate-byW-re System with ABS

ana Traction Control .......................Page 6

Braue -by-Wire System

with Inching Control...................._______Page 6

Closed Loop Pressure

Conirol System ............Page 7

Brake-by-Wire System for Trailers..............Page 7

Electronic Pedals with Brake Valve Interface........................Pages 8 8 9

Digital Valve Controller..............................Page 10

ZETA Controller.........................................Page 11

Valve Driver................................................Page 12

Brake Valve EBV-M Series..............Pages 13 & 14

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