User's Manual

3
For vehicles with the (optional) Hill Start Aid (HSA) system
(sometimes referred to as a “Hill Start Assist”, or simply “Hill
Start”), this feature interfaces between the transmission
and the braking system. HSA helps the driver prevent
the vehicle from rolling downhill when moving up a steep
incline from a stationary position. See page 6 for more
information.
YAW CONTROL (YC)
A Bendix
®
EC‑80
™
ESP
®
Controller includes Yaw Control
(YC) functionality. Yaw Control has the ability to apply
brakes to individual wheel ends, as well as applying the
trailer brakes, to counteract trailer “push” that — during
certain maneuvers — could lead to a loss‑of‑control or
a jackknife incident. See "Yaw Stability" on page 13 for
further details.
ROLL STABILITY PROGRAM (RSP)
The Bendix
®
Roll Stability Program (RSP), is an all‑axle
ABS solution that helps decrease vehicle speed by
reducing the engine's throttle and applying all vehicle
brakes as needed, mitigating the vehicle's tendency to
roll over. RSP focuses on reducing the vehicle’s speed
below the critical roll threshold during direction‑changing
maneuvers — such as driving on curved highway exit
ramps or obstacle avoidance maneuvers on dry, high
friction surfaces. See "ESP ABS with Stability Control"
on page 12 for further details.
During an RSP system intervention, the vehicle
automatically decelerates. RSP can slow the
vehicle with or without the operator applying
the brake pedal, and even when the operator is
applying the throttle.
COMPONENTS
The Bendix ESP EC‑80 Controller’s ABS function utilizes
the following components:
• Bendix
®
WS‑24
™
Wheel Speed Sensors (four or
six, depending on the conguration), each with a
clamping sleeve. [Refer to SD-13-4860]
• Bendix
®
M‑40QR
™
or M‑40‑HF
™
Pressure Modulator
Valves (four, ve, or six may be present) [refer to
SD-13-4958]. For legacy systems where a Bendix
®
M‑32
™
or M‑32QR
™
Pressure Modulator Valve is
used, refer to SD-13-4870.
• A dash‑mounted tractor ABS Indicator Lamp
• A service brake Relay Valve
• A dash‑mounted trailer ABS Indicator Lamp
• An optional blink code Activation Switch
• An optional ABS Off‑road Switch
The Bendix ESP EC‑80 Controller's ESP/RSP function
utilizes the following additional components:
• A Steer Axle Traction Control Valve (may be integral
to the service brake Relay Valve or a stand‑alone
device)
90° Speed
Sensors
Sensor
Clamping
Sleeve
Straight Speed
Sensors
FIGURE 2 - BENDIX
®
WS‑24
™
WHEEL SPEED SENSORS
Delivery
(Port 2)
Supply
(Port 1)
Exhaust (Port 3)
Electrical
Connector
M-40X
™
Modulator
FIGURE 3 - EXAMPLE OF A BENDIX M‑40X
™
MODULATOR
• A dash‑mounted ESP Status/Indicator Lamp (also
serves as the ATC Status/Indicator Lamp)
• A Bendix
®
SAS‑60
™
Steering Angle Sensor
(mounted to the steering column ‑ See Figure 4)
When replacing a steering wheel, take care not to
damage the Steering Angle Sensor or interfere with
its operation, and the Steering Angle Sensor must be
recalibrated (see Troubleshooting section.)
Straight
Connector
90° Connectors
FIGURE 4 - EXAMPLES OF STEERING ANGLE SENSORS