Vehicle power supply control method and vehicle power supply control device

Abstract

A vehicle power supply control device includes a main battery connected to a power supply circuit, a sub-battery having an internal resistance lower than an internal resistance of the main battery, an electric generator which is connected to the power supply circuit and has a controllable power generation voltage, and a connection controller configured to connect the sub-battery to the power supply circuit after adjusting a voltage on a side of the power supply circuit close to a voltage of the sub-battery by controlling the power generation voltage of the electric generator. The main battery is configured to be disconnectable from the power supply circuit. The connection controller is configured to disconnect the main battery from the power supply circuit first, then control the power generation voltage of the electric generator to adjust the power generation voltage close to the voltage of the sub-battery.

1 . A vehicle power supply control method comprising:
 connecting a sub-battery having an internal resistance lower than an internal resistance of a main battery to a power supply circuit to which the main battery is connected, after adjusting a voltage on a side of the power supply circuit close to a voltage of the sub-battery by controlling a power generation voltage of an electric generator connected to the power supply circuit,   wherein the main battery is configured to be disconnectable from the power supply circuit,   wherein the main battery is disconnected from the power supply circuit first,   wherein the power generation voltage of the electric generator is then controlled to adjust the power generation voltage close to the voltage of the sub-battery,   wherein the sub-battery is connected to the power supply circuit,   wherein with a voltage of the main battery dropped upon power consumption by an electrical equipment load connected in parallel with the main battery, the power generation voltage of the electric generator is controlled to increase and adjust the voltage of the sub-battery close to the voltage of the main battery, and   wherein the main battery is connected to the power supply circuit.   
     
     
         2 . The vehicle power supply control method according to  claim 1 , wherein the power generation voltage of the electric generator is controlled to adjust the voltage on the side of the power supply circuit close to the voltage of the sub-battery. 
     
     
         3 . (canceled) 
     
     
         4 . The vehicle power supply control method according to  claim 1 , wherein a switch for the main battery is used to select whether the main battery is to be connected to the power supply circuit or disconnected from the power supply circuit. 
     
     
         5 . The vehicle power supply control method according to  claim 1 , wherein a switch for the sub-battery is used to select whether the sub-battery is to be connected to the power supply circuit or disconnected from the power supply circuit. 
     
     
         6 . A vehicle power supply control device comprising:
 a main battery connected to a power supply circuit;   a sub-battery having an internal resistance lower than an internal resistance of the main battery;   an electric generator which is connected to the power supply circuit and has a controllable power generation voltage; and   a connection controller configured to connect the sub-battery to the power supply circuit after adjusting a voltage on a side of the power supply circuit close to a voltage of the sub-battery by controlling the power generation voltage of the electric generator,   wherein the main battery is configured to be disconnectable from the power supply circuit, and   wherein the connection controller is configured to:
 disconnect the main battery from the power supply circuit first, 
 then control the power generation voltage of the electric generator to adjust the power generation voltage close to the voltage of the sub-battery, 
 connect the sub-battery to the power supply circuit, 
 with a voltage of the main battery dropped upon power consumption by an electrical equipment load connected in parallel with the main battery, control the power generation voltage of the electric generator to increase and adjust the voltage of the sub-battery close to the voltage of the main battery, and connect the main battery to the power supply circuit. 
   
     
     
         7 . The vehicle power supply control method according to  claim 2 , wherein a switch for the main battery is used to select whether the main battery is to be connected to the power supply circuit or disconnected from the power supply circuit. 
     
     
         8 . The vehicle power supply control method according to  claim 2 , wherein a switch for the sub-battery is used to select whether the sub-battery is to be connected to the power supply circuit or disconnected from the power supply circuit. 
     
     
         9 . The vehicle power supply control method according to  claim 4 , wherein a switch for the sub-battery is used to select whether the sub-battery is to be connected to the power supply circuit or disconnected from the power supply circuit.