# US 7,609,035 B2 · Power generation control device for controlling power generation system of movable body and power generation control method

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- Number: US 7,609,035 B2
- Document ID: US7609035B2
- Status: Granted
- Kind: B2
- Application number: 11/704,932
- Filed: 2007-02-12
- Published: 2007-08-16
- Granted: 2009-10-27
- Earliest claimed: 2006-12-13
- Assignees: Fujitsu Ten Limited
- Inventors: Kazuhi Yamaguchi
- Web page: https://patentgrep.com/patent/US7609035B2

## CPC

- H02J 7/1446: {in response to parameters of a vehicle}
- B60R 16/03: for supply of electrical power to vehicle subsystems {or for (circuit arrangements for charging batteries H02J7/00)}
- H02J 7/1438: {in combination with power supplies for loads other than batteries}
- H02J 2105/33: exchanging power with road vehicles
- Y02T 10/92: Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A power generation control device enables to conduct appropriate charge control and load limitations even if a technique (charge control technique) for restricting power generation by a generator in an accelerating state of a movable body is adopted in a movable body such as a vehicle in which a technique (load limiting technique) for imposing limitations on a power supply when a quantity of suppliable electricity decreased has been adopted. The power generation control device for controlling a generator for a movable body which stores electric power in a battery comprises a unit for restricting power generation by the generator based on a battery suppliable current which can be taken out of the battery, a quantity of electricity generated by the generator, an essential supply current consumed by an electric load to which electric power must be supplied and a load working current consumed by an electric load which does not necessarily require a power supply.

## Claims

### Claim 1

A power generation control device for controlling a generator for a movable body which stores electric power in a battery, comprising:
an electric load monitoring unit for monitoring a quantity of load electricity consumed by a first electric load;
a driving state judging unit for judging whether the movable body is in an accelerating state or not; and
a power generation control unit for controlling power generation by the generator based on a battery suppliable current which can be taken out of the battery, a quantity of electricity generated by the generator, an essential supply current consumed by a second electric load to which electric power must be supplied, and a load working current consumed by the first electric load which is detected by the electric load monitoring unit, when it is judged that the movable body is in the accelerating state by the driving state judging unit,
wherein the power generation control unit controls power generation by the generator when it is judged that a first power generation control condition that a value obtained by subtracting the essential supply current and the load working current from the battery suppliable current is a prescribed value (≧0) or more has been satisfied.

### Claim 2 (depends on 1)

A power generation control device according to claim 1, comprising:
a masking unit for masking malfunction detection resulting from a stop of power generation by the generator when power generation by the generator is controlled by the power generation control unit.

### Claim 3

A power generation control device for controlling a generator for a movable body which stores electric power in a battery, comprising:
an electric load monitoring unit for monitoring a quantity of load electricity consumed by a first electric load;
a driving state judging unit for judging whether the movable body is in an accelerating state or not; and
a power generation control unit for controlling power generation by the generator based on a battery suppliable current which can be taken out of the battery, a quantity of electricity generated by the generator, an essential supply current consumed by a second electric load to which electric power must be supplied, and a load working current consumed by the first electric load which is detected by the electric load monitoring unit, when it is judged that the movable body is in the accelerating state by the driving state judging unit,
wherein the power generation control unit controls power generation by the generator when it is judged that a second power generation control condition that a deficiency of electricity obtained by subtracting the battery suppliable current from a value obtained by adding the essential supply current and the load working current is smaller than the quantity of electricity generated by the generator has been satisfied.

### Claim 4 (depends on 3)

A power generation control device according to claim 3,
wherein the power generation control unit controls power generation by the generator in such a manner that the quantity of electricity generated becomes a value obtained by adding a prescribed quantity of electricity (≧0) to the deficiency of electricity or more when it is judged that the second power generation control condition has been satisfied, and
wherein the prescribed quantity of electricity is set based on a battery charging rate.

### Claim 5 (depends on 4)

A power generation control device according to claim 4, comprising:
a battery charging rate calculating unit for calculating a battery charging rate based on a battery open voltage.

### Claim 6

A power generation control device for controlling a generator for a movable body which stores electric power in a battery, comprising:
an electric load monitoring unit for monitoring a quantity of load electricity consumed by a first electric load;
a driving state judging unit for judging whether the movable body is in an accelerating state or not;
a power generation control unit for controlling power generation by the generator based on a battery suppliable current which can be taken out of the battery, a quantity of electricity generated by the generator, an essential supply current consumed by a second electric load to which electric power must be supplied, and a load working current consumed by the first electric load which is detected by the electric load monitoring unit, when it is judged that the movable body is in the accelerating state by the driving state judging unit; and
a battery suppliable current calculating unit for calculating the battery suppliable current based on a battery open voltage, a discharge final voltage, and an internal resistance of the battery.