Power supply device of vehicle
A control device controls a boost converter to be operated in one of a continuous voltage-boosting mode in which the converter is continuously operated and in an intermittent voltage-boosting mode in which the converter is intermittently operated. The control device permits the converter to be controlled in the intermittent voltage-boosting mode when an atmospheric pressure is equal to or greater than a first prescribed value, and inhibits the converter from being controlled in the intermittent voltage-boosting mode when the atmospheric pressure is less than the first prescribed value.
1. A power supply device of a vehicle, said power supply device comprising:
a power storage device;
an electric motor;
a boost converter connected to said power storage device and said electric motor, boosting a voltage of said power storage device, and supplying the boosted voltage to said electric motor; and
a control device controlling said boost converter to be operated in one of a continuous voltage-boosting mode in which said boost converter is continuously operated and an intermittent voltage-boosting mode in which said boost converter is intermittently operated,
said control device permitting said boost converter to be controlled in said intermittent voltage-boosting mode when an atmospheric pressure P is equal to or greater than a first prescribed value P 1 , and inhibiting said boost converter from being controlled in said intermittent voltage-boosting mode when said atmospheric pressure P is less than said first prescribed value P 1 ,
assuming that a maximum value of an output voltage of said boost converter at which said electric motor is not broken under an environment of atmospheric pressure P is defined as V 1 (P), on conditions of V 2 (P)=V 1 (P)−ΔD and V 3 (P)=V 2 (P)−ΔVH, said first prescribed value P 1 satisfying a condition of V 3 (P 1 )=MAX_VH, in which ΔD shows a margin for a withstand voltage of said electric motor, ΔVH shows a limit value at which a deviation between the output voltage of the boost converter and a command voltage of the output voltage of said boost converter is allowed, and MAX_VH shows a maximum value of the output voltage that can be output from said boost converter.
2. A power supply device of a vehicle, said power supply device comprising:
a power storage device;
an electric motor;
a boost converter connected to said power storage device and said electric motor, boosting a voltage of said power storage device, and supplying the boosted voltage to said electric motor; and
a control device controlling said boost converter to be operated in one of a continuous voltage-boosting mode in which said boost converter is continuously operated and an intermittent voltage-boosting mode in which said boost converter is intermittently operated,
said control device permitting said boost converter to be controlled in said intermittent voltage-boosting mode when an atmospheric pressure P is equal to or greater than a first prescribed value P 2 , and inhibiting said boost converter from being controlled in said intermittent voltage-boosting mode when said atmospheric pressure P is less than said first prescribed value P 2 ,
when a difference between an output voltage of said boost converter and a command voltage of the output voltage of said boost converter is equal to or greater than a limit value ΔVH(P) during discontinuation of voltage boosting by said boost converter in said intermittent voltage-boosting mode, said control device causing said boost converter to resume voltage boosting,
when said atmospheric pressure P is equal to or greater than a second prescribed value P 1 that is greater than said first prescribed value P 2 , said control device setting said limit value ΔVH(P) at a fixed value V 0 ,
when said atmospheric pressure P falls within a range of said first prescribed value P 2 or more and less than said second prescribed value P 1 , said control device setting said limit value ΔVH(P) at a value that is equal to or less than said fixed value V 0 and decreases as said atmospheric pressure P decreases,
assuming that a maximum value of an output voltage of said boost converter at which said electric motor is not broken under an environment of atmospheric pressure P is defined as V 1 (P), on conditions of V 2 (P)=V 1 (P)−ΔD and V 4 (P)=V 2 (P)−ΔVH(P), a condition of ΔVH(P)=V 0 (fixed value) being satisfied in a range of P 1 ≦P, and ΔVH(P) linearly increasing as P increases in a range of P 2 ≦P<P 1 ,
said second prescribed value P 1 satisfying a condition of V 4 (P 1 )=MAX_VH, in which ΔD shows a margin for a withstand voltage of said electric motor, said limit value ΔVH(P) shows a limit value at which a deviation between the output voltage of the boost converter and a command voltage of the output voltage of said boost converter is allowed, and MAX_VH shows a maximum value of the output voltage that can be output from said boost converter.
3. The power supply device of a vehicle according to claim 2 , wherein
when said atmospheric pressure P is equal to or greater than said second prescribed value P 1 , said control device sets an upper limit value of said command voltage at a maximum value MAX_VH of a voltage that said boost converter can output, and
when said atmospheric pressure P falls within the range of said first prescribed value P 2 or more and less than said second prescribed value P 1 , said control device sets the upper limit value of said command voltage based on said limit value ΔVH(P).