Power supply system control device and power supply system control method (nissan motor) gas after eating fruit

#

There is a known vehicular power supply system that includes a lithium-ion battery and a lead battery as two secondary batteries. JP 5494498B describes, as control of such a power supply system, voltage-variable control in which the voltage (set voltage) of electric power output from an electric generator is variably controlled. Furthermore, according to the description of this document, when electric loads (e.g., headlights and windshield wipers) that require high voltage have been actuated, the voltage-variable control is prohibited by fixing the set voltage between a voltage upper limit and a voltage lower limit of the voltage-variable control, or control for reducing an upper limit of the set voltage and increasing a lower limit of the set voltage is performed in the voltage-variable control. SUMMARY

The control described in the foregoing document is started when the windshield wipers and the like have been actuated. Therefore, for example, if there is conduction between the electric generator and the lithium-ion battery when the required voltage has increased, the generated electric power is absorbed by the lithium-ion battery even if the power generation voltage of the electric generator is increased in response to the increase in the required voltage. This causes a delay in an increase in the voltage supplied to the electric loads.

According to one or more embodiments of this invention, there is provided a power supply system control device for controlling a power supply system that includes an electric generator, first electricity storage means capable of being charged with and discharging electric power generated by the electric generator, second electricity storage means capable of being charged with and discharging the generated electric power, two paths connecting between the first electricity storage means and the second electricity storage means, switching means including a first switch configured to switch between a conductive state and a non-conductive state of one of the paths, and a second switch configured to switch between a conductive state and a non-conductive state of the other of the paths, and an electric load of a vehicle being connected to the first electricity storage means side of the switching means. When the power supply system control device determines that actuation of the electric load has a possibility of requiring higher voltage than normal, it increases a remaining amount of charge in the second electricity storage means in advance. BRIEF DESCRIPTION OF DRAWINGS

The following describes embodiments of the present invention with reference to the attached drawings. In embodiments of the invention, numerous specific details are set forth in order to provide a more thorough understanding of the invention. However, it will be apparent to one of ordinary skill in the art that the invention may be practiced without these specific details. In other instances, well-known features have not been described in detail to avoid obscuring the invention.

As shown in FIG. 1, in an engine 1, an electric generator 2 and an air conditioner compressor 4 are provided respectively at one side and the other side, each via a non-illustrated bracket and the like. A belt 8 is wound across a crank pulley 5 mounted on a distal end of a crankshaft of the engine 1, an electric generator pulley 6 mounted on a distal end of a rotation shaft of the electric generator 2, and a compressor pulley 7 mounted on a distal end of a rotation shaft of the air conditioner compressor 4. Thus, the crank pulley 5, the electric generator pulley 6, and the compressor pulley 7 are mechanically joined to one another.

Although the three pulleys, i.e., the crank pulley 5, the electric generator pulley 6, and the compressor pulley 7 are mechanically joined to one another using one belt 8 in FIG. 1, each of the electric generator pulley 6 and the compressor pulley 7 may be mechanically joined to the crank pulley 5 using an individual belt 8. The belt(s) may be replaced with a chain(s).

The engine 1 includes a starter 9 located in the vicinity of a junction with an automatic transmission 11. Similarly to an ordinary starter for startup, the starter 9 includes a pinion gear that moves forward and backward. When the starter 9 is actuated, the pinion gear engages with a gear provided on an outer periphery of a drive plate mounted on a proximal end portion of the crankshaft, thereby performing cranking. A supply of electric power to the starter 9 will be described later.

The automatic transmission 11 includes an electric oil pump 10 for securing a control hydraulic pressure during the idling stop. The electric oil pump 10 is actuated in response to an instruction from an automatic transmission controller 20, and improves responsiveness when starting from the idling stop.

The electric generator 2 generates electric power while being driven by a driving force of the engine 1. In generating the electric power, the power generation voltage can be variably controlled via Local Interconnect Network (LIN) communication or a hard wire. The electric generator 2 can also regenerate kinetic energy of a vehicle as electric power during deceleration of the vehicle. Control over such power generation and regeneration is performed by an engine control module (ECM) 19.

The ECM 19 reads in detection signals from various types of sensors including a crank angle sensor 12, a battery sensor, and an atmospheric pressure sensor, as well as signals from various types of switches including a brake switch, to control a fuel injection amount, an ignition timing, the idling stop, and the like. Furthermore, the ECM 19 performs optimal control for the vehicle through intercommunication with an ABS/VDC unit 21, an air conditioner amplifier 22, an electric power steering unit 25, a vehicle controller 26, a power distribution controller 23, a meter unit 24, and an advanced driver assistance system (ADAS) unit 27 via a controller area network (CAN).