Abstract: A master clock on a truck maintains vehicle standard time for the purposes of monitoring and recording vehicle performance data throughout the vehicle. Vehicle performance data is stored for a predefined period of time in response to detecting predefined events. Instances of vehicle performance data are time stamped with vehicle standard time. The master vehicle clock can also maintain the local time displayed to the driver. In response to inputs from the driver, the difference between driver local time and vehicle standard time is computed and the updated local time is displayed to the driver.

Abstract: A method for determining installed electronic devices on a truck and for providing a centralized reset to clear faults in the installed electronics. An instrumentation control unit in the cab of a truck determines installed electronics by requesting electronics on a shared data link to transmit data on the data link. The control unit identifies the installed devices from the transmitted data. Data describing the installed devices including manufacturer, model, and installed software can be obtained and displayed for diagnostic purposes. The instrumentation control unit provides a centralized reset for resetting the electronic devices on the data link.

Abstract: A diagnostic method and system in a truck monitors voltages reported by electrical control units in a truck via a shared communication path called the data link. When a data logging unit on the data link detects an event, it persistently stores monitored data measured during a period that may span before and after the event occurred. The voltages measured and reported by electrical control units during this period are used to diagnose electrical wiring problems or other electrical problems in the electrical control units.

Abstract: A master clock on a truck maintains vehicle standard time for the purposes of monitoring and recording vehicle performance data throughout the vehicle. Vehicle performance data is stored for a predefined period of time in response to detecting predefined events. Instances of vehicle performance data is time stamped with vehicle standard time. The master vehicle clock can also maintain the local time displayed to the driver. In response to inputs from the driver, the difference between driver local time and vehicle standard time is computed and the updated local time is displayed to the driver.