Wabco - Volvo I-shift

Glossary

10 Glossary

Direct drive One of the two I-Shift transmission variants (next to the overdrive variant). The transmis-
transmission sion ratio in the highest, namely the 12th gear, is here 1:1. The input torque is here trans-
ferred to the drive shaft unchanged.
EECU
Idler Acronym for “Engine Electronic Control Unit”.

Overdrive The gear wheels on the main shaft for the first, the second and the reverse gear are idlers.
transmission This means that they are not firmly connected with the main shaft but can rotate freely.
Only with the temporary intervention of the respectively adjacent sliding sleeve is an idler
Range High positively locked with the main shaft.
Range Low
RECU One of the two I-Shift transmission variants (next to the direct drive variant). The
Split High transmission ratio is here already 1:1 in the 11th gear. In 12th gear the transmission ratio is
Split Low longer than with the direct drive transmission, namely 0,79:1. In this gear the engine speed
TECU is therefore less than that of the direct drive transmission at the same vehicle speed. This
can reduce the fuel consumption, for instance.

Designates the higher of the two transmission ratios that are provided by the range group.

Designates the lower of the two transmission ratios that are provided by the range group.

Acronym for “Retarder Electronic Control Unit”.

Designates the higher of the two transmission ratios that are provided by the splitter group.

Designates the lower of the two transmission ratios that are provided by the splitter group.

Acronym for “Transmission Electronic Control Unit”.

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