World Transmission (Wt) Electronic Controls; Jacobs Engine Brake - PREVOST H3-41 Manual

OTHER FEATURES
average consumption value can be reset by
pressing the SET button while in this display (the
Trip Fuel Meter value will also be reset).
Trip Fuel Meter
The Trip Fuel Meter displays the amount of fuel
used since the last time it was reset. Its range is
from 0 to 9999 gallons or liters (driver
selectable). The Trip Fuel Meter value can be
reset by pressing the SET button while in this
display (the AVG fuel consumption value will
also be reset).
PRODRIVER™
PRODRIVER™ is an optional graphic device
similar to TDR but with added features. A
summary of data displays available from
PRODRIVER™ include:
•
Instantaneous and average fuel
consumption rate;
•
Trip time, miles driven, fuel used, fuel
consumption rate, average speed;
•
Driving time, percentage, miles, fuel used,
fuel consumption rate;
•
Idle time, percentage and fuel used;
•
Cruise time, percentage, miles cruised, fuel
used, fuel consumption rate;
•
Top gear time, percentage, miles driven,
fuel used, fuel consumption rate;
•
Overspeed time and percentage for two
speed thresholds;
•
Over-rev time and percentage;
•
Maximum vehicle speed and RPM;
•
Coasting time and percentage;
•
Automated oil change interval tracking;
•
Hard braking incident records;
•
Driver initiated incident records;
•
Stop and check engine code logs.
PRODRIVER™ has many additional features
and benefits and can be combined with other
members of Data Hub line of products from
Detroit Diesel. This combination presents a
powerful vehicle information management
system and provides advanced communication
business solutions for fleet operators.
WORLD TRANSMISSION (WT)
ELECTRONIC CONTROL
Works with the automatic transmission with
push-button shift selector.
The World Transmission (WT) electronic
controls comprises four major elements:
Electronic Control Unit (ECU), Throttle Position
Sensor (TPS), speed sensors and shift selector.
Refer to "Controls & Instruments" chapter.
These components work together to
electronically control the transmission functions.
The throttle sensor, speed sensors, and shift
selector transmit information to the ECU. The
ECU processes this information and then sends
signals to actuate specific solenoids located on
the control valve body in the transmission. The
action of the solenoids affect hydraulic circuits,
which in turn control the upshifts, downshifts,
and lock-up functions. In addition to controlling
the operation of the transmission, the WT
electronic controls monitor the system for
abnormal conditions.
When one of these conditions is detected, WT
electronic control system is programmed to
automatically respond in a manner which is safe
for the driver, the vehicle and the transmission.
The WT electronic control system turns on the
"DO NOT SHIFT" light on the dashboard, which
serves as a fault indicator.
To enhance troubleshooting and to allow
interrogation of the ECU (Electronic Control
Unit) for valuable service information, the shift
selector display or a diagnostic tool (not
supplied) can be used. For information about
reading and interpreting diagnostic codes, refer
to "Technical Information" chapter under "World
Transmission (WT) Diagnostic Codes".

JACOBS ENGINE BRAKE

The JACOBS engine brake is an optional diesel
engine retarder which uses engine compression
to aid in slowing and controlling the coach.
When activated, (refer to "Controls &
Instruments" chapter) the JACOBS brake alters
the operation of the engine's exhaust valves so
that the engine works as a power-absorbing air
compressor. This provides a retarding action to
the wheels.
The engine brake is a vehicle-slowing device,
not a vehicle-stopping device. It is not a
substitute for the service braking system. The
coach's service brakes must be used to bring
the coach to a complete stop.
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