The motorhome is equipped with an anti-lock braking system. This system
monitors wheel rotation speeds by using a 100 tooth magnetic tone ring mount-
ed to the hub. Revolving with the wheel, the magnetic tone ring is polarized giv-
ing positive and negative pulsations. A stationary sensor is mounted adjacent to
the tone ring monitoring the magnetic pulses. The pulses are monitored by the
ABS electronic control unit(ECU). The ECU monitors all available wheel sen-
sors at the rate of 100 times per second. The ECU controls Pressure Modulator
Valves. Pressure Modulator Valves have two electric over air solenoids, a hold
solenoid and a release solenoid. The modulator valves are open under normal
braking, allowing a straight through air signal from the treadle valve to the brake
chamber. Should a wheel lose traction under a braking application, the ECU will
energize the hold solenoid of the Pressure Modulator Valve to interrupt the air
signal from the treadle valve to the brake chamber, while the release solenoid
vents the existing air signal to the atmosphere allowing the skidding tire to
regain traction. Skidding tires have less tractive efficiency. It is possible under
certain conditions to have the wheel(s) skid with a normal functioning ABS sys-
tem.
The ABS itself does not apply additional braking power. The purpose of the
ABS is limiting brake torque to prevent wheel locking that results in the loss of
lateral stability and increased stopping distances. Cautious driving practices and
maintaining adequate safe distances when following vehicles is the key to safe
vehicle operation.
ABS Component Function
Speed sensors and tone rings on each
wheel monitor wheel rotation.
Each speed sensor communicates wheel
rotation pulses to the Electronic Control
Unit.
ECU receives the speed sensor inputs,
interprets the signal pulses, calculates speed
and acceleration rates of each wheel.
Based on the speed sensor input, the
ECU detects impending wheel lock and
operates the ABS Modulator Valves
required for proper control. The Modulator
Valves can be operated in the air. Release or
hold modes to regulate air pressure to the
brake chambers.
The braking force is applied at a level
which minimizes the stopping distances,
while maintaining as much lateral stability
as possible.
Chassis Information
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E X E C U T I V E
7 • 2 1 1
ABS System
(Anti-lock Brakes)
Summary of Contents for Executive 2001
Page 1: ......
Page 6: ...E X E C U T I V E SECTION 1 WARRANTY INFORMATION...
Page 7: ......
Page 22: ...E X E C U T I V E SECTION 2 OPERATING SAFETY...
Page 23: ......
Page 46: ...E X E C U T I V E SECTION 3 APPLIANCES EQUIPMENT...
Page 47: ......
Page 106: ...E X E C U T I V E CHAPTER 4 WATER LP GAS SYSTEMS...
Page 107: ......
Page 129: ...Water LP Gas Systems EXECUTIVE 4 1 2 9 NOTES...
Page 130: ...E X E C U T I V E SECTION 5 ELECTRICAL SYSTEMS...
Page 131: ......
Page 177: ...Electrical Systems 5 1 7 7 EXECUTIVE N NO OT TE ES S...
Page 178: ...E X E C U T I V E SECTION 6 UNIT CARE MAINTENANCE...
Page 179: ......
Page 203: ...Unit Care Maintenance EXECUTIVE 6 2 0 3 NOTES...
Page 204: ...E X E C U T I V E SECTION 7 CHASSIS INFORMATION...
Page 205: ......