Catalogue Electro-Hydraulic Components
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Electrohydraulic Brake Systems
Brake-by-Wire System with ABS and Traction Control (See Figure 5)
When designers want to remove the modulating valve from the cab, brake-by-wire systems should be considered. ABS and traction control can be added in a similar manner as shown in the previous examples. However, in this system design the electrohydraulic modulating brake valve is used to control the brake system at all times. Each key component in the system has redundancy to assure reliability. Features of this type of system include:
• Provides primary and secondary braking to meet industry standards
• ABS and traction control for improved control
• Programmable pressure vs. pedal angle functions
• Ability to easily add additional remote operator stations
• Automated braking can be programmed to occur based on inputs from other sensors or control systems
^ Operator warning signal and vehicle stop light control
• Fault diagnostics for easy troubleshooting
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ACCUMULATOR 1
ACCUMULATOR 2
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ELECTROHYDRAULIC MODULATING BRAKE VALVE 3
ELECTROHYDRAULIC MODULATING BRAKE
VALVE 4
Brake-By-Wire System with Inching Control
(See Figure 6)
These systems allow the machine operator to have proportional inching and braking control in one pedal. The first half of pedal travel is devoted to inching control. The second half controls braking. There is a step in pedal effort at the midpoint of pedal travel to indicate to the operator that further pedal travel results in braking of the vehicle. During inching the Brake-By-Wire controller interprets the inching signal and controls the displace­ment of the hydrostatic transmission or mechanical clutch by means of an electrohydraulic pressure, modulating valve (EBV). During braking the Brake-By-Wire controller interprets the braking signal and controls the amount of braking by means of a second electrohydraulic pressure, modulating valve (EBV). Features of this type of system include the following:
• Ability for designers to remove the brake valve and industrial hydraulic hoses from the operator station
• Elimination of complicated linkages and valves for control of inching and braking
• edal force feedback is dual gain and proportional to pedal angle
• rogrammable set points and gains for inching and braking
• Operator warning and vehicle stop light control.
• Fault diagnostics for easy troubleshooting 6
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ACCUMULATOR
MICO
ELECTROHYDRAULIC MODULATING
BRAKE VALVE I___TIL.!?___
BRAKE LIGHT
VARNING
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MICO
ELECTRONIC PEDAL
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BRAKE-BY-WIRE CONTROLLER WITH INCHING
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MICO
ELECTROHYDRAULIC PRESSURE
MODULATING ¡ |____
VALVE I___ _"T_B
HYDROSTATIC TRANSMISSION
OR
MECHANICAL
CLUTCH
FIGURE 6
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