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| | | | | | | | | | | | | | | | | | | | | | | | | | Electrohydraulic Brake Systems | | | | | | | | | | (See Figure 3) Vehicle safety can be improved with the use of an anti-lock brake system giving operators control even in poor traction conditions. A typical full power brake system is used consisting of a pump, accumulator charge valve, dual accumulators and tandem modulating valve. ABS valves are normally open, which allow the tandem modulating valve to control braking pressure proportional to operator input force at the brake pedal. Speed sensors send electronic pulses, at a frequency proportional to wheel speed, to the ABS electronic control unit. The ABS control algorithm determines how much current is sent to each of the ABS valves. When the ABS valve receives current, pressure from the tandem modulating valve is blocked to the brake and pressure at the brake relieved. This allows the wheel to continue turning rather than slipping excessively. See Form 80-950-243. NOTE: ABS control algorithms are dependent on vehicle dynamics and must be adjusted for optimal control of the vehicle. Please consult your MICO Sales Representative or call MICO, Incorporated for further details. | | | | | | | | | | Full Power Brake System with Traction Control (See Figure 4) A full power brake system with traction control can help operators maintain traction with the ground in the poor traction conditions often experienced with off-highway vehicles. A typical full power brake system is used consisting of a pump, accumulator charge valve, dual accumulators and tandem modulating valve. electrohydraulic modulating brake valves are normally open, which allow the tandem modulating valve to control braking pressure proportional to operator input force at the brake pedal. Speed sensors send electronic pulses, at a frequency proportional to wheel speed, to the traction control system ("TCS") electronic control unit. The TCS control algorithm determines how much current is sent to each of the electrohydraulic modulating brake valves. When the electrohydraulic modulating brake valve receives current, pressure from the accumulators is used to modulate pressure to the brakes. This stops the wheel from turning excessively and improves the vehicle's traction. A check valve manufacturer is added to the electrohydraulic modulating brake valve that allows the output of the tandem modulating valve to override the pressure created by the electrohydraulic modulating brake valve and traction control system. NOTE: A two-channel full power brake system with traction control is shown. Systems with additional channels can be designed. Please consult your MICO Sales Representative or call MICO, Incorporated for further details. | | | | | | FIGURE 3 | | | | | | | | | | ACCUMULATOR 2 | | | | | | | | | | ACCUMULATOR 1 | | | | | | | | | | | | | | | | | | - | | | | | | | MICO DUAL | | | | | | ACCUMULATOR | | | | | | CHARGING VALVE | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 5 | | | | | | | | | | | | | | | | | | | | | | | | | |
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