Vehicle and control method therefor

Patent metadata

Field	Value
Publication number	US-10124794-B2
Application number	US-201715643653-A
Country	US
Kind code	B2
Filing date	Jul 7, 2017
Priority date	Jul 8, 2016
Publication date	Nov 13, 2018
Grant date	Nov 13, 2018

Abstract

A first electric power generation device configured to produce an accessory voltage according to a first instruction voltage. A second electric power generation device configured to produce the accessory voltage according to a second instruction. An electric control unit is configured to execute crank position stop control for stopping a crank of the engine at a target position when the engine is stopped by controlling the first electric power generation device such that a current is circulated in the first electric power generation device and the rotating electric machine generates braking torque. The electric control unit is configured to execute the crank position stop control in a state in which the second instruction voltage is equal to or higher than the first instruction voltage.

First claim

What is claimed is:

1. A vehicle comprising:
an engine;
a first electric power generation device including a rotating electric machine connected to a crankshaft of the engine, the first electric power generation device being configured to produce an accessory voltage according to a first instruction voltage, using torque that the rotating electric machine receives from the crankshaft;
a second electric power generation device configured to produce the accessory voltage according to a second instruction voltage using a voltage source different from the rotating electric machine without using the torque of the crankshaft; and
an electric control unit configured to execute crank position stop control for stopping the crankshaft of the engine at a target position when the engine is stopped by controlling the first electric power generation device such that a current is circulated in the first electric power generation device and the rotating electric machine generates braking torque,
wherein the electric control unit is configured to execute the crank position stop control in a state in which the second instruction voltage is equal to or higher than the first instruction voltage.

2. The vehicle according to claim 1 , wherein the electric control unit is configured to, when the first instruction voltage is higher than the second instruction voltage before executing the crank position stop control, execute the crank position stop control after increasing the second instruction voltage to the first instruction voltage.

3. The vehicle according to claim 2 , wherein the electric control unit is configured to, when the first instruction voltage is equal to or lower than the second instruction voltage before executing the crank position stop control, execute the crank position stop control without changing the second instruction voltage.

4. The vehicle according to claim 1 , wherein the electric control unit is configured to, when the first instruction voltage is higher than the second instruction voltage before executing the crank position stop control, execute the crank position stop control after decreasing the first instruction voltage to be equal to or lower than the second instruction voltage at a predetermined rate.

5. The vehicle according to claim 4 , wherein the electric control unit is configured to, when the first instruction voltage is equal to or lower than the second instruction voltage before executing the crank position stop control, execute the crank position stop control without changing the first instruction voltage.

6. The vehicle according to claim 1 , further comprising:
an electric motor configured to produce drive power of the vehicle; and
an electric power storage device configured to store electric power supplied to the electric motor,
wherein the second electric power generation device includes a converter configured to deboost a voltage of electric power supplied from the electric power storage device to produce the accessory voltage.

7. A control method for a vehicle,
the vehicle including an engine, a first electric power generation device including a rotating electric machine connected to a crankshaft of the engine, the first electric power generation device being configured to produce an accessory voltage according to a first instruction voltage, using torque that the rotating electric machine receives from the crankshaft, a second electric power generation device configured to produce the accessory voltage according to a second instruction voltage using a voltage source different from the rotating electric machine without using the torque of the crankshaft, and an electronic control unit,
the control method comprising:
when the engine is stopped, determining, by the electronic control unit, whether or not the second instruction voltage is equal to or higher than the first instruction voltage; and
when the electronic control unit determines that the second instruction voltage is equal to or higher than the first instruction voltage, executing, by the electronic control unit, crank position stop control for stopping a crank of the engine at a target position when the engine is stopped by controlling the first electric power generation device such that a current is circulated in the first electric power generation device and the rotating electric machine generates braking torque.

Assignees

• Toyota Motor Co Ltd

Inventors

• Akuzawa Ken

Classifications

• B60Y2300/192

  Power-up or power-down of the driveline, e.g. start up of a cold engine · CPC title

• F02N2011/0885

  Capacitors, e.g. for additional power supply · CPC title

• F02N19/005

  Aiding engine start by starting from a predetermined position, e.g. pre-positioning or reverse rotation · CPC title

• B60W10/08

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

• F02N2011/0888

  DC/DC converters · CPC title