BENDIX M-21-M-22 ANTILOCK MOD ASSY Manual de servicio descargar pdf (Pagina 20)

Physical Description

The EC-16 electronics are contained in a die-cast aluminum housing and are environ-

mentally protected by a self-healing silicone compound. The metal housing and the

design of the digital electronics are intended to provide a high degree of protection

from radio and electromagnetic interference.

The patented light-emitting diode (LED) display and a magnetically actuated reset

switch is incorporated in the housing for troubleshooting and diagnostic purposes.

Two electrical connectors, located in the controller housing opposite the diagnostic

display, connect the EC-16 to antilock and traction system components: one 30-pin

and one 18-pin Packard Electric 150 series “Metri-pack” connector. In addition to

these tow-housing mounted connectors, the EC-16 also uses a 2-pin Deutsch con-

nector when programmed with the optional traction control feature. The 2-pin connec-

tor is linked to a traction solenoid, which is located in the upper portion of the antilock

traction relay valve assembly. (See Figure)

Mounting—The E-16 receives information from several components in the system

and, based on these inputs, issues commands or delivers information. Some portions

of the EC-16 both receive and deliver commands and information. (See Figure)

Inputs

Wheel speed information is provided to the EC-16 via a wiring harness from individual

wheel sensors at the vehicle wheels. Working with an exciter, wheel speed sensors

provide information to the EC-16 in the form of an AC signal, which varies in voltage

and frequency as the speed of the wheel increases or decreases. The EC-16 is

designed to receive wheel speed information from various wheel speed sensor mod-

els, at the rate of 100 pulses per wheel revolution. The EC-16 is able to simultaneously

receive, and individually interpret, speed signals from six wheel speed sensors. Vehicle

drive configuration and whether the traction control feature is in use determines the

number of speed sensors that must be used. A tractor with a single rear axle drive (4 x

2, 4 x 4 or 6 x 2) requires four speed sensors for both antilock and traction operation.

A vehicle with two rear drive axles (6x4) requires 4 speed sensors for antilock-only

operation, but have the option to use 6 speed sensors for enhanced performance of

both antilock and traction operation.

Vehicle power is supplied to the EC-16 from the ignition switch through a fuse or cir-

cuit breaker. (30 amp.) The electrical ground for the EC-16 is the vehicle chassis.

Outputs

Modulators, like the Bendix M-21 or M-22, are the means by which the EC-16 con-

troller modifies driver-applied air pressure to the service brakes. The modulator is an

electrically controlled air valve located near the service actuator(s) it controls. It is the

last valve that air passes through on its way to the brake actuator. A wiring harness

connects the modulator to the EC-16 antilock controller. Solenoid valves contained in

the modulator provide the electrical interface between the EC-16 controller electronics

and the air brake system. The EC-16 is able to simultaneously and independently con-

trol four individual modulator assemblies.

Air Brake System

Revised 11/15/99

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