VEHICLE POWER SUPPLY APPARATUS AND VEHICLE POWER REGENERATION SYSTEM

摘要

A vehicle power supply apparatus includes: a switching element; a DC-DC converter; and a control unit. During an idling stop, the control unit turns on the switching element, and controls the DC-DC converter to discharge electricity from an electricity storage unit to supply electric power to loads, and when the voltage of the electricity storage unit decreases to a predetermined value, the control unit stops discharging to hold electric power of the electricity storage unit, continuously maintains the switching element ON to supply electric power to the loads, and transmits a signal indicating that the idling stop can be continuously maintained. When the idling stop ends and an engine is re-started, the control unit turns off the switching element, and controls the DC-DC converter to discharge electricity from the electricity storage unit to supply remaining electric power of the electricity storage unit to a second load.

主权项

1. A vehicle power supply apparatus comprising:
a switching element comprising: one end connectable to a direct-current power supply to which a first load and a generator are connected in parallel; and the other end connectable to a second load which is required to be protected such that a voltage supplied to the second load does not decrease; a bi-directional DC-DC converter comprising: a first input/output terminal connected to the other end of the switching element and the second load; and a second input/output terminal connected to an electricity storage unit which stores regenerative electric power generated by the generator; a control unit which controls an operation of the switching element and the DC-DC converter; a voltage detection unit which detects a voltage of the electricity storage unit; and a communication unit which communicates with an upper-level apparatus, wherein during an idling stop in which an engine of a vehicle is stopped by a start-stop system,
the control unit turns on the switching element, and controls driving of the DC-DC converter such that the electricity storage unit discharges electricity to supply electric power from the electricity storage unit to the first load and the second load, andwhen the voltage of the electricity storage unit decreases to a predetermined value, the control unit controls the DC-DC converter such that discharging of the electricity storage unit is stopped to hold electric power of the electricity storage unit, continuously maintains an ON state of the switching element to supply electric power from the direct-current power supply to the first load and the second load, and transmits a signal to the upper-level apparatus via the communication unit, the signal indicating that the idling stop can be continuously maintained, and wherein when the idling stop ends, and the engine of the vehicle is re-started, the control unit turns off the switching element, and controls the driving of the DC-DC converter such that the electricity storage unit discharges electricity to supply remaining electric power of the electricity storage unit to the second load.