Patent ID: 8854210

Claim:
An eco-drive assist apparatus that shows a degree of eco of a driving operation of a vehicle, the eco-drive assist apparatus comprising; an eco-drive assist information generating apparatus that calculates a judgment threshold value and a state quantity of eco drive, the state quantity of eco drive indicating a ratio to the judgment threshold value, and the judgment threshold value fluctuating based on the driving state of the vehicle; and a display device that is comprised of a different body with the eco-drive assist information apparatus, and executes a display based on information transmitted from the eco-drive assist information generating apparatus, the display device displaying a relative state to the judgment threshold value, wherein the eco-drive assist information generating apparatus is a control apparatus that controls an engine mounted to the vehicle, calculates the state quantity of eco-drive based on a control state signal of the engine acquired during the engine control, transmits the state quantity of eco-drive to the display device, determines whether a vehicle state is at least one of a failure state, an exception state in which information for assisting eco-drive is not necessary to be displayed, and a parked state, and transmits the determined vehicle state to the display device, and the display device does not execute the display based on information transmitted from the eco-drive assist information generating apparatus when the vehicle state transmitted from the eco-drive assist information generating apparatus is at least one of the failure state, the exception state, and the parked state.