ECVT System

Automatic Transmission - (MINI COOPER Only)
The ECVT (Electro Constantly Variable Transmission) is available on the MINI COOPER. The origins of the Continuously Variable Transmission (ECVT) manufactured by ZF dates back to 1974 with, at that time, a revolutionary rubber drive belt. After several years of development, a new generation of ECVT has evolved, incorporating the use of a steel drive belt.

Purpose of the System
The stepless shifting pattern of the transmission provides a very comfortable drive, as well as having full vehicle performance, available at any time.

The advantages of using an automatic transmission of this type are:

- Low engine revolutions at constant speeds.
- Improved emission control/fuel consumption.
- Low noise, vibration and harshness levels.
- Smooth acceleration.
- Flexible driving on mountain roads.

The ECVT consists of a number of elements that are divided into three groups, depending upon their function.

Group One
Elements providing the mechanical torque flow through the transmission. These elements are:

- Planetary gear set
- Multiplate clutches
- Primary pulley
- Steel drive belt
- Secondary pulley
- Pinion shaft
- Differential unit

Group Two
These elements relate to the hydraulic system. This system enables the transmission to transmit power and to vary the ratio in a proper way, according to load conditions and driver demand.
- Hydraulic pump
- Hydraulic control unit

Group Three
These elements are externally connected to other systems:

- Ratio Control Motor
- Park/Neutral Switch
- Output Shaft Speed Sensor
- Instrument Cluster Display
- Selector Shift Mechanism
- Steering Wheel Remote Buttons (Optional)
- GIU (gearbox interface unit)

The Ratio Control Motor, Park/Neutral Switch and Output Shaft Speed Sensor are inside the transmission.