Speed Control: Introduction

There are two variants of speed control available, a standard system and an adaptive system. The standard system maintains a set speed selected by the driver until operation is suspended or cancelled by a further input from the driver and is controlled by the engine control module (ECM). The adaptive system includes the same functionality as the standard system, but also has the ability to:

• Reduce vehicle speed, to less than the set speed, in order to maintain a selected distance behind a slower moving vehicle
• Accelerate the vehicle back to the set speed, once the way ahead is clear, after reducing the set speed because of a slower moving vehicle
• Alert the driver when the vehicle comes within a given distance of a slower moving vehicle.

The standard system and the adaptive system both have the following components:

• A set +/- switch
• A RESUME switch
• A CANCEL switch.

Both systems also use:

• The engine control module (ECM)
• The stoplamp switch
• The accelerator pedal position (APP) sensor.

The adaptive system incorporates the following additional components:

• An adaptive speed control module
• An adaptive speed control sensor
• A forward alert switch
• A time gap switch.