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ContinuousWave: Small Boat Electrical
Mercury Digital Throttle and Shift Production Changes
|Author||Topic: Mercury Digital Throttle and Shift Production Changes|
posted 11-25-2007 10:42 AM ET (US)
Mercury Marine's Digital Throttle and Shift (DTS) has been standard on their Verado motors and optional on a few OptiMax motors since 2004. However, there have been several changes in the DTS rigging and software which limit the functionality of the units depending on the epoch. Some of the variations are as follows:
DTS only supported single or dual engine installation. Only a single helm location was supported. No foot throttle option was supported
Triple or quadruple engines added. Dual helm locations added. Foot throttle control added.
The "shadow" control, where three engines can be operated and controlled by only two throttle and shift levers, added. Power trim control from throttle handles after engine shutdown added.
The newer features cannot be retrofit onto older models as hardware changes to the wiring harness and software changes to the PCM controller and Command Module are required.
Source: Mercury Service Bulletin 2005-07
posted 11-26-2007 09:49 PM ET (US)
When Mercury Marine Digital Throttle and Shift (DTS) controls are operating three or four engines with only two shift and throttle control levers--quadruple or triple engines in "shadow" mode--there is a rather complex matrix of control actions which is governed mainly by the ignition key position of the three or four engines. This page explains in detail all of the various combinations and resultant control actions:
As you can see, the logic circuitry involved in accomplishing these decisions is rather complex. This is a good indicator of the degree of sophistication and intelligence which can be built into the control system when it is implemented primarily in software.
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