Hybrid vehicle and method of controlling hybrid vehicle

• US 9,469,292 B2
• Filed: 03/11/2015
• Issued: 10/18/2016
• Est. Priority Date: 04/28/2014
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Hisano, Taishi
• Primary Examiner(s): Sample, Jonathan L
• Application Number:
  US14/644,760
• Publication Number:
  US 20150307083A1
• Time in Patent Office: 587 Days
• US Class Current: 1/1
• CPC Class Codes: B60K 6/445 Differential gearing distribution type
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 10/26 for electrical energy, e.g. batteries or capacitors
• CPC Class Codes: B60W 20/13 in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion
• CPC Class Codes: B60W 2510/0604 Throttle position
• CPC Class Codes: B60W 2510/244 Charge state
• CPC Class Codes: B60W 2520/105 Longitudinal acceleration
• CPC Class Codes: B60W 2710/0677 Engine power
• CPC Class Codes: B60W 2710/086 Power
• CPC Class Codes: B60W 2710/244 Charge state
• CPC Class Codes: B60W 2710/248 Current for loading or unloading
• CPC Class Codes: B60W 50/082 Selecting or switching between different modes of propelling
• CPC Class Codes: B60W 50/085 Changing the parameters of the control units, e.g. changing limit values, working points by control input
• CPC Class Codes: Y02T 10/40 Engine management systems
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y02T 10/84 Data processing systems or methods, management, administration
• CPC Class Codes: Y10S 903/93 Conjoint control of different elements

Abstract

A hybrid vehicle according to the present invention includes an engine, a power storage device, a motor generator, and an ECU. The motor generator receives electric power from the power storage device and generates travel driving force. The ECU selects one of a CD mode and a CS mode to cause the vehicle to travel, in the CD mode an SOC of the power storage device being consumed, in the CS mode the SOC being maintained within a prescribed range. The CS mode includes a first CS mode and a second CS mode, the first CS mode being selected when the SOC decreases to a prescribed amount, the second CS mode being selected based on a user'"'"'s intention. A second prescribed range corresponding to the second CS mode is set to be wider than a first prescribed range corresponding to the first CS mode.

Claims

1. A hybrid vehicle comprising:

an internal combustion engine;

a power storage device that is chargeable/dischargeable;

a rotating electric machine configured to receive electric power from the power storage device and generates travel driving force; and

a control device for selecting one of a CD (Charge Depleting) mode and a CS (Charge Sustaining) mode to cause the hybrid vehicle to travel, in the CD mode an SOC of the power storage device being consumed, in the CS mode the SOC being maintained within a prescribed range,

the CS mode including a first CS mode and a second CS mode, the first CS mode being selected when the SOC decreases to a prescribed amount, the second CS mode being selected based on an intention of a user, and

a second prescribed range corresponding to the second CS mode being set to be wider than a first prescribed range corresponding to the first CS mode.

2. The hybrid vehicle according to claim 1, wherein, when a prescribed mode in which reduction in fuel consumption is prioritized over acceleration is selected in the second CS mode, the control device sets the second prescribed range to be further wider than that in a case where the prescribed mode is not selected.

3. The hybrid vehicle according to claim 1, wherein

when required power becomes larger than a prescribed threshold value, the control device drives the internal combustion engine to cause the hybrid vehicle to travel using driving force from the internal combustion engine in addition to driving force from the rotating electric machine, and

when a prescribed mode in which reduction in fuel consumption is prioritized over acceleration is set in the second CS mode, the control device sets the prescribed threshold value to be larger than that in a case where the prescribed mode is not selected.

4. The hybrid vehicle according to claim 1, wherein, when the internal combustion engine is operated in a case where the second CS mode is selected, the control device adjusts required charge power so as to be close to a prescribed operating point at which operating efficiency of the internal combustion engine is enhanced.

5. The hybrid vehicle according to claim 1, wherein

the first prescribed range is determined based on the prescribed amount, and

the second prescribed range is determined based on the SOC at a time when the second CS mode is selected by the user.

6. The hybrid vehicle according to claim 1, wherein

when the CS mode is selected, the control device sets required charge power for the power storage device in accordance with the SOC, and

when the second CS mode is selected, the control device sets the required charge power to be larger than that in a case where the first CS mode is selected.

7. A method of controlling a hybrid vehicle by a controller, the vehicle including an internal combustion engine and a rotating electric machine that operates using electric power from a power storage device, the method comprising the step of:

selecting one of a CD mode and a CS mode as a traveling mode of the hybrid vehicle, in the CD mode an SOC of the power storage device being consumed, in the CS mode the SOC being maintained within a prescribed range; and

controlling the hybrid vehicle based on the selected traveling mode,

the CS mode including a first CS mode and a second CS mode, the first CS mode being selected when the SOC decreases to a prescribed amount, the second CS mode being selected based on an intention of a user, the method further comprising the step of;

setting a second prescribed range corresponding to the second CS mode to be wider than a first prescribed range corresponding to the first CS mode.