Bendix Commercial Vehicle Systems EC-60 ESP Controllers (Advanced Models) - Manual (Page 5)

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Bendix ® YAS-60 ™ Yaw Rate/Lateral Acceleration
Sensor
The Yaw Rate/Lateral Acceleration Sensor is used to
provide the controller an indication of vehicle lateral
acceleration and rotation around the vertical axis. This
information is provided to the controller utilizing a dedicated
serial communications link that is shared with the SAS-60 ™
sensor. The controller supplies the power and ground inputs
to the YAS-60 ™ sensor.
EC-60 ™ CONTROLLER OUTPUTS
Bendix ® M-32 ™ and M-32QR ™ Pressure
Modulator Valves (PMV)
The Bendix ® M-32 ™ and M-32QR ™ pressure modulator
valves (PMV) are operated by the EC-60 ™ controller to
modify driver applied air pressure to the service brakes
during ABS, ATC, RSP or YC activation (See pages 7-8).
The PMV is an electropneumatic control valve and is the
last valve that air passes through on its way to the brake
chamber. The modulator hold and release solenoids are
activated to "modulate" or "control" the brake pressure
during an antilock braking event. The hold solenoid is
normally open and the release solenoid is normally closed,
such that the PMV nominally allows air to flow through.
This design allows for air delivery to brake chambers in
the event of electrical trouble.
The Advanced EC-60
™ controller also utilizes an additional
PMV for control of the trailer service brakes during stability
interventions.
Traction Control Valve (TCV)
Advanced EC-60 ™ controllers use two TCVs, one on the
steer axle and one on the drive axle. The TCV may be
a separate valve or integrated into the rear axle relay
valve.
The controller will activate the drive axle TCV during
differential braking ATC events.
During stability interventions, the ECU will activate both
the steer axle and drive axle TCVs as required.
Stop Lamp Output
The controller provides an output to control a relay
that illuminates the vehicle stop lamps during stability
interventions. This information is also available using the
J1939 serial communications link.
ABS Indicator Lamp Control with Optional
Diagnostic Blink Code Switch
The Advanced EC-60 ™ controller has internal circuitry to
control the ABS Indicator Lamp on the dash panel.
The ABS Lamp Illuminates:
1. During power up (e.g. when the vehicle is started) for
approximately 3 seconds and turns off after the self test
is completed, providing no Diagnostic Trouble Codes
(DTCs) are present on the ECU.
2. When full ABS operation is not available due to
presence of a DTC on the ECU.
3. If the ECU is unplugged or has no power.
4. When the ECU is placed into the ABS off-road mode
(the lamp flashes steadily at a rate of once per 2.5
sec.).
5. To display blink codes for diagnostic purposes after the
external diagnostic switch is activated.
The EC-60 ™ controller may communicate with other
vehicle control modules to operate the ABS Indicator Lamp
using serial communications. (If you need to know if this
EC-60 ™ controller uses serial communications to operate
the lamp, e-mail [email protected], specifying the ECU
part number, or call 1-800-AIR-BRAKE and speak to the
Bendix Tech Team.)
Indicator Lamp Control Using Serial
Communications Links
As mentioned above, depending on the vehicle manufacturer,
the dash indicator lamps (ABS, ATC, ESP and trailer ABS)
may be controlled using serial communications links.
In these cases, the EC-60 ™ controller will send a serial
communications message over the J1939 or J1587 links
indicating the required status of the lamp(s). Another
vehicle control module receives the message and controls
the indicator lamp(s).
Retarder Relay Disable Output
The retarder relay disable output may be used to control a
retarder disable relay. When configured to use this output,
the ECU will energize the retarder disable relay and inhibit
the use of the retarder as needed.
SAE J1939 Serial Communications
A Controller Area Network (CAN) data link (SAE J1939) is
provided for communication. This link is used for various
functions, such as:
• To disable retarding devices during ABS operation.
• To request torque converter lock-up during ABS
operation.
• To share information such as wheel speed and ECU
status with other vehicle control modules.
Advanced EC-60 ™ controllers utilize the J1939 data link for:
• ATC and drag torque control functions.
• Vehicle stability functions.
Trailer ABS Indicator Lamp Control
The Advanced EC-60 ™ controller will activate a trailer ABS
Indicator Lamp (located on the dash panel) that indicates
the status of the trailer ABS unit on one, or more trailers, or
dollies that are equipped with PLC functionality. Typically,
the EC-60 ™ controller directly controls the trailer ABS
Indicator Lamp based on the information it receives from
the trailer ABS, via PLC.
Alternatively, some vehicles require the EC-60
™ controller to
activate the trailer ABS Indicator Lamp by communicating with
other vehicle controllers using serial communications.