Hybrid vehicle

• US 20020195288A1
• Filed: 06/19/2002
• Published: 12/26/2002
• Est. Priority Date: 06/25/2001
• Status: Active Grant

• Current Assignee: Nissan Motor Co., Ltd.
• Original Assignee: Nissan Motor Co., Ltd.
• Inventors: Komiyama, Susumu, Yamaguchi, Musashi
• Granted Patent: US 6,799,650 B2
• Time in Patent Office: Days
• US Class Current: 180/65.245
• CPC Class Codes: B60K 6/46 Series type
• CPC Class Codes: B60L 2260/42 by adaptive correction
• CPC Class Codes: B60L 50/61 by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles
• CPC Class Codes: B60L 58/24 for controlling the temperature of batteries
• CPC Class Codes: B60L 58/27 by heating
• 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 20/00 Control systems specially adapted for hybrid vehicles hybrid vehicle design, B60K6/00; electric vehicles B60L
• 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 2050/0012 Feedforward or open loop systems
• CPC Class Codes: B60W 2050/0022 Gains, weighting coefficients or weighting functions
• CPC Class Codes: B60W 2510/244 Charge state
• CPC Class Codes: B60W 2510/246 Temperature
• CPC Class Codes: B60W 2540/10 Accelerator pedal position
• CPC Class Codes: B60W 2710/0666 Engine torque
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors

Abstract

A maximum charging power when a battery (6) is warmed up is set, and a target rotation speed is set based on the sum of the engine output required to drive the vehicle and the maximum charging power. The target charging power when the battery (6) is warmed up, is computed based on the charge state of the battery (6). The target torque of the engine (1) is set by dividing the target engine output, obtained based on the sum of the engine output required to drive the vehicle and the target charging power, by the engine rotation speed. In the battery warm-up control, the rotation speed of the engine (1) and generator (2) is controlled to the target rotation speed, and the torque of the engine (1) is controlled to the target torque.

Claims

1. A hybrid vehicle comprising:

an engine,

a generator connected to the engine which rotates in synchronism with the engine,

a motor which drives a vehicle wheel,

a battery which is electrically connected to the generator and the motor,

a sensor which detects a charge state of the battery,

a sensor which detects the rotation speed of the engine and generator, and

a controller which functions to;

set a maximum charging power when the battery is warmed up,

set a target rotation speed based on the sum of an engine output required to drive the vehicle and the maximum charging power,

compute a target charging power when the battery is warmed up, based on the battery charge state,

set a target engine torque by dividing a target engine output, obtained based on the sum of the engine output required to drive the vehicle and the target charging power, by the engine rotation speed, and

when the battery is warmed up, control the rotation speed of the engine and generator to the target rotation speed and control the torque of the engine to the target engine torque.

2. The hybrid vehicle as defined in claim 1, further comprising:

a sensor which detects a temperature of the battery, and wherein;

the controller further functions to set the maximum charging power according to the battery temperature.

3. The hybrid vehicle as defined in claim 2, wherein:

the controller further functions to set the maximum charging power to be smaller, the higher the battery temperature becomes.

4. The hybrid vehicle as defined in claim 1, wherein:

the controller further functions to set the target rotation speed so that the power equal to the sum of the engine output required to drive the vehicle and the maximum charging power, can be output on the maximum torque line of the engine.

5. The hybrid vehicle as defined in claim 1, wherein:

the controller further functions to set the target rotation speed so that the power equal to the sum of the engine output required to drive the vehicle and the maximum charging power, can be output on the best fuel efficiency line of the engine.

6. The hybrid vehicle as defined in claim 1, wherein:

the controller further functions to set the target rotation speed to the larger of the target rotation speed when the battery is warmed up, and a second target rotation speed found due to requirements other than battery warm-up.

7. The hybrid vehicle as defined in claim 1, wherein:

the controller further functions to;

compare a permissible input power of the battery computed based on the battery charge state with a discharge power of the battery, and

compute the target charging power by selecting the power with the higher current flowing through the battery from the permissible input power and the discharge power.

8. The hybrid vehicle as defined in claim 1, wherein:

the controller further functions to set the target rotation speed so that the loss of the generator is compensated.

9. The hybrid vehicle as defined in claim 1, further comprising:

an auxiliary device connected to the battery, wherein;

the controller other functions to set the target engine torque so that the power consumption of the auxiliary device is compensated.

10. The hybrid vehicle as defined in claim 1, wherein:

the controller further functions to set the target engine torque so that the loss of the motor is compensated.

11. A hybrid vehicle comprising:

an engine,

a generator connected to the engine which rotates in synchronism with the engine,

a motor which drives a vehicle wheel,

a battery which is electrically connected to the generator and the motor,

means for detecting a charge state of the battery,

means for detecting the rotation speed of the engine and generator,

means for setting a maximum charging power when the battery is warmed up,

means for setting a target rotation speed based on the sum of an engine output required to drive the vehicle and the maximum charging power,

means for computing a target charging power when the battery is warmed up, based on the battery charge state,

means for setting a target engine torque by dividing a target engine output, obtained based on the sum of the engine output required to drive the vehicle and the target charging power, by the engine rotation speed, and

means for controlling the rotation speed of the engine and generator to the target rotation speed and controlling the torque of the engine to the target engine torque when the battery is warmed up.