Controllable Speed Propulsion System - A high performance, economical propulsion
control system.
Propulsion System Decision Matrix
System
Cost
Complexity
Performance
Controllable Speed
Propulsion System
$
Uses standard gearbox,
modified for clutch pressure
control
Full control from low to high speed
with unparalleled performance,
especially with DP
Controllable Pitch
Propeller
$$$
Highly complex submerged
hydraulic machinery
Full control from low to high speed,
large hub limits top end
performance
Two Speed Gearbox
$$
Modified gearbox with dual
ratio gears
Limited performance improvement
with stop to shift between gears
Jet Drive
$$
Uses standard gearbox and
hydraulic water jet system
High fuel consumption under all
load conditions
System Benefits:

- Infinitely variable gear ratio performance with standard gearbox
- Maintenance requirements the same as standard gears
- Smooth shift performance and quiet operation during Dynamic Positioning
- Lowest cost solution with higher performance for today's high performance, high
power                 engines
- Automatic self protection to reduce catastrophic failures
- Closed loop engine and transmission cooling system is environmentally safe
- Reduces engine lugging during low speed maneuvering
- Greatly improved fuel economy during Dynamic Positioning
- Quieter operation for more crew and passenger comfort
- PC displays all monitored parameters and provides continuous logging of data
Components of the system are:
- Throttle Levers, single or dual design for up to 7 stations and 6 engines
- Control modules mounted on engine
- Wiring harnesses for each engine and control lever
- All essential items to convert gearbox for slip operation
- PC and software for display and data logging
- Dynamic Positioning interface
- Engine throttle interface
- Engine speed sensor
- Shaft speed sensor
- Transmission oil pressure sensor
- Transmission oil temperature sensor

How the system works:

Propeller speed is controlled for the first 30% of throttle lever travel with engine speed held
constant.  Above 30% the clutch is fully engaged and the engine speed is increased to increase
shaft speed.  When interfaced to a Dynamic Positioning system, control of the shaft speed can be
commanded by the DP controls.

The system monitors transmission operation to help prevent damage due to failures or normal
wear.  Verbal warnings from the PC generated audio system communicate to the operator
conditions that need attention.  If conditions exist that could cause catastrophic failures to the
transmission, the system will derate engine operation to idle speed and place the transmission in
neutral.  The protection feature operates over the entire speed range of the engine/transmission, not
just at initial engagement.  This feature has been shown to prevent clutch damage even when the
failure occurs at maximum engine speed.   The system will also interface to vessels ship-to-shore
email system to report system operating conditions and alerts.

The system also provides 2 other operating modes.  Engine Only Mode allows operation of the
engine with the transmission in neutral.  Fire Pump Mode operates with the transmission in neutral
with a limited top engine speed to prevent fire pump damage.

The system is designed to ABS and Coast Guard requirements.

Technical Specifications:

Supply voltage: .............................................................................................. 9 to 16 Vdc
Supply current: .................................................................................................. 1.25 Adc
Communications link: ................................................................ 250kbaud CAN Network
Shift response time: ........................................................................................... 100 mSec
Gear Pressure sensing range: ........................................................................ 0 to 500 PSI
Gear oil temperature range: ........................................................................... -30 to 300 F
Minimum controlled shaft speed: ......................................................................... 50 RPM
Engine throttle interface: ................................................................................... 0 to 5 Vdc
Dynamic positioning interface voltages: ........................................................... 0 to 10 Vdc



Available now on Cummins Engines and Twin Disc Transmissions.  Others available on request.


Other CSP Products

- Full Vessel Monitor System
- Engine and Gear Control with Protection System
- All Electric Steering System
Controllable Speed Propulsion
CSP Electronics, LLC
806 E. Main St. Unit B
Broussard, LA  70518
(985) 397-2880
CSP vs Standard Transmissions