Automatic Temperature Control (ATC)

ATC in trucks
When traveling long distances, it used to be necessary to continuously re-adjust the manual heating in the driver's cabin in order to achieve an agreeable temperature. WABCO's electronic Automatic Temperature Control (ATC) system regulates the temperature in line with a characteristic curve designed to reflect the human sense of comfort. When outside temperatures are low, a slightly higher temperature is generated in the cabin without the driver's intervention. On warm day, ATC provides for an increased throughput. When temperatures are low, it ensures that the driver's cabin heats up quickly and the windscreen is de-iced rapidly. In the first case, the volume of air is regulated continuously, while in the second case the water flow is controlled. This regulation also takes place if the vehicle is fitted with an additional air conditioning unit. Furthermore, ATC allows the driver to switch off the automatic mode and regulate the speed of the fan manually.

ATC in city buses
VDV Publication 236 has established a new basis for air conditioning in city buses. To fully meet these requirements WABCO's ATC components have been further developed, benefiting from the experience and volume effects of our various commercial vehicles systems. The components have CAN interfaces that allow them to communicate with each other and other systems. WABCO's operating console is based on four basic modules, to be used in different configurations together with sub-stations.

ATC in motor coaches
Based on the ATC city bus system, the more complex variant for motor coaches consists of an enlarged operating console and up to eight sub-stations (identical to the city bus). In motor coaches ATC provides for a larger scope of intervention by the driver. Temperatures, index values and fan speeds are shown on the dashboard display. A timer for the pre-selection of the auxiliary heating system has also been integrated in the control system.