Electrically driven vehicle

Patent metadata

Field	Value
Publication number	US-11203274-B2
Application number	US-201916589023-A
Country	US
Kind code	B2
Filing date	Sep 30, 2019
Priority date	Oct 9, 2018
Publication date	Dec 21, 2021
Grant date	Dec 21, 2021

Abstract

A vehicle includes an inverter, a first battery, a first power line, a second battery, a second power line, and a voltage converter. Ranges of use with respect to open circuit voltages of the first battery and the second battery do not overlap each other, and ranges of use with respect to closed circuit voltages of the first and the second batteries overlap each other. When a regenerative power output from the inverter to the first power line is supplied to the second power line via the voltage converter, and the second battery is charged, an ECU calculates a maximum regenerative power with respect to the regenerative power output from the inverter to the first power line based on the open circuit voltage of the first battery and controls the inverter and the voltage converter such that the regenerative power does not exceed the maximum regenerative power.

First claim

What is claimed is:

1. An electrically driven vehicle comprising:
an electric motor that is coupled to a driving wheel;
a power converter that transmits and receives a power with respect to the electric motor;
a first circuit to which the power converter and a first power storage device are connected;
a second circuit to which a second power storage device is connected;
a voltage converter that converts a voltage between the first circuit and the second circuit; and
a control device,
in a case that a range of use with respect to a first open-circuit voltage that is an open-circuit voltage of the first power storage device does not overlap a range of use with respect to a second open-circuit voltage that is an open-circuit voltage of the second power storage device, and a range of use with respect to a first closed-circuit voltage that is a closed-circuit voltage of the first power storage device overlaps a range of use with respect to a second closed-circuit voltage that is a closed-circuit voltage of the second power storage device,
the control device that controls the power converter and the voltage converter in the following manners such that, when one of the first and second power storage devices serves as a charging target power storage device and the other serves as a non-charging target power storage device, a regenerative power output from the power converter to the first circuit is supplied to the charging target power storage device, and the charging target power storage device is charged, the control device calculates an upper limit power with respect to the regenerative power output from the power converter to the first circuit based on an open-circuit voltage of the non-charging target power storage device and controls the power converter and the voltage converter such that the regenerative power does not exceed the upper limit power.

2. The electrically driven vehicle according to claim 1 , wherein
the control device calculates the upper limit power such that a closed-circuit voltage of the charging target power storage device during charging becomes equal to or lower than the open-circuit voltage of the non-charging target power storage device.

3. The electrically driven vehicle according to claim 2 , further comprising:
a mechanical braking device that applies a mechanical braking force to the driving wheel,
wherein the control device acquires a request braking force with respect to a braking force to be applied to the driving wheel, and
when a request parameter indicating a magnitude of the request braking force is larger than an upper limit parameter indicating a magnitude of the upper limit power, the control device controls the mechanical braking device such that the mechanical braking force reaches a magnitude corresponding to a difference between the request parameter and the upper limit parameter.

4. The electrically driven vehicle according to claim 2 , wherein
the control device calculates the upper limit power such that the closed-circuit voltage of the charging target power storage device during charging becomes equal to the open-circuit voltage of the non-charging target power storage device.

5. The electrically driven vehicle according to claim 4 , wherein
the range of use with respect to the first open-circuit voltage is higher than the range of use with respect to the second open-circuit voltage,
the charging target power storage device is the second power storage device, and the non-charging target power storage device is the first power storage device, and
the control device includes:
a deterioration upper limit voltage calculation unit that calculates a deterioration upper limit voltage, which is an upper limit voltage with respect to the second closed-circuit voltage during charging, such that the second power storage device does not deteriorate based on a state of the second power storage device, and
an upper limit power calculation unit that calculates the upper limit power based on a power to be consumed to charge the second power storage device when the second closed-circuit voltage is used as a charging upper limit voltage that is a lower voltage of the deterioration upper limit voltage and the first open-circuit voltage, and a charging current corresponding to a difference between the charging upper limit voltage and the second open-circuit voltage is supplied to the second power storage device.

6. The electrically driven vehicle according to claim 5 , further comprising:
a mechanical braking device that applies a mechanical braking force to the driving wheel,
wherein the control device acquires a request braking force with respect to a braking force to be applied to the driving wheel, and
when a request parameter indicating a magnitude of the request braking force is larger than an upper limit parameter indicating a magnitude of the upper limit power, the control device controls the mechanical braking device such that the mechanical braking force reaches a magnitude corresponding to a difference between the request parameter and the upper limit parameter.

7. The electrically driven vehicle according to claim 4 , wherein
the range of use with respect to the second open-circuit voltage is higher than the range of use with respect to the first open-circuit voltage,
the charging target power storage device is the first power storage device, and the non-charging target power storage device is the second power storage device, and
the control device includes:
a deterioration upper limit voltage calculation unit that calculates a deterioration upper limit voltage, which is an upper limit voltage with respect to the first closed-circuit voltage during charging such that the first power storage device does not deteriorate based on a state of the first power storage device, and
an upper limit power calculation unit that calculates the upper limit power based on a power to be consumed to charge the first power storage device when the first closed-circuit voltage is used as a charging upper limit voltage that is a lower voltage of the deterioration upper limit voltage and the second open-circuit voltage, and a charging current corresponding to a difference between the charging upper limit voltage and the first open-circuit voltage is supplied to the first power storage device.

8. The electrically driven vehicle according to claim 7 , further comprising:
a mechanical braking device that applies a mechanical braking force to the driving wheel,
wherein the control device acquires a request braking force with respect to a braking force to be applied to the driving wheel, and
when a request parameter indicating a magnitude of the request braking force is larger than an upper limit parameter indicating a magnitude of the upper limit power, the control device controls the mechanical braking device such that the mechanical braking force reaches a magnitude corresponding to a difference between the request parameter and the upper limit parameter.

9. The electrically driven vehicle according to claim 4 , further comprising:
a mechanical braking device that applies a mechanical braking force to the driving wheel,
wherein the control device acquires a request braking force with respect to a braking force to be applied to the driving wheel, and
when a request parameter indicating a magnitude of the request braking force is larger than an upper limit parameter indicating a magnitude of the upper limit power, the control device controls the mechanical braking device such that the mechanical braking force reaches a magnitude corresponding to a difference between the request parameter and the upper limit parameter.

10. The electrically driven vehicle according to

Assignees

• Honda Motor Co Ltd

Inventors

• Oguma Hirokazu

Classifications

• H02J2105/37

  exchanging power with electric vehicles [EV] or with hybrid electric vehicles [HEV] · CPC title

• B60W10/26

  for electrical energy, e.g. batteries or capacitors · CPC title

• H02K47/04

  Motor/generators · CPC title

• B60W10/08

  including control of electric propulsion units, e.g. motors or generators · CPC title

• B60W10/18

  including control of braking systems · CPC title