Hybrid vehicle and method of controlling hybrid vehicle

• US 8,880,251 B2
• Filed: 11/05/2008
• Issued: 11/04/2014
• Est. Priority Date: 11/05/2008
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Matsumoto, Junichi
• Primary Examiner(s): Cheung, Calvin
• Assistant Examiner(s): QUILLEN, ALLEN ERNEST
• Application Number:
  US13/127,575
• Publication Number:
  US 20110213524A1
• Time in Patent Office: 2,190 Days
• Field of Search: 701/22, 320/104, 180/65.29, 903/903
• US Class Current: 701/22
• CPC Class Codes: B60K 6/445 Differential gearing distribution type
• CPC Class Codes: B60L 58/15 Preventing overcharging
• CPC Class Codes: B60L 58/24 for controlling the temperature of batteries
• CPC Class Codes: B60L 58/25 by controlling the electric load
• 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 2510/244 Charge state
• CPC Class Codes: B60W 2510/246 Temperature
• CPC Class Codes: H01M 10/443 in response to temperature
• CPC Class Codes: H01M 10/48 Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569
• CPC Class Codes: H01M 10/486 for measuring temperature
• CPC Class Codes: H02J 7/007194 of the battery
• CPC Class Codes: H02J 7/14 for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• 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: Y10S 903/903 having energy storing means, e.g. battery, capacitor

Abstract

A battery ECU detects a state of charge and a temperature of a power storage unit, and transmits the state of charge and the temperature to an HV-ECU. The HV-ECU calculates the charge/discharge allowable power of the power storage unit based on the state of charge and the temperature of the power storage unit, and sets control-specific charge/discharge allowable power by correcting the charge/discharge allowable power so as to limit the charge/discharge allowable power to be changed at a predetermined first change speed. The HV-ECU then determines the power target value in accordance with the request from the driver within the range of the control-specific charge/discharge allowable power. The HV-ECU sets the control-specific charge/discharge allowable power such that, at start-up of the vehicle, the maximum value in the charge/discharge allowable power characteristics of the power storage unit is set as an initial value and the value is decreased from the initial value at the predetermined second change speed higher than the first change speed.

Claims

1. A hybrid vehicle comprising:

an internal combustion engine;

a power generation unit capable of generating electric power by receiving power generated by an operation of said internal combustion engine;

a power storage unit configured to be chargeable by receiving the electric power from said power generation unit;

a driving force generation unit generating a driving force of a vehicle by receiving the electric power supplied from said power storage unit; and

a control device controlling the driving force of the vehicle generated in response to a request from a driver and controlling the electric power charged and discharged in said power storage unit,

said control device including

a power storage unit state detection unit detecting a state of charge and a temperature of said power storage unit,

a charge/discharge allowable power calculation unit calculating charge/discharge power allowable in said power storage unit based on the state of charge and the temperature of said power storage unit detected by said power storage unit state detection unit,

a charge/discharge allowable power control unit setting control-specific charge/discharge allowable power by correcting charge/discharge allowable power calculated by said charge/discharge allowable power calculation unit so as to limit the charge/discharge allowable power to be changed at a predetermined first change speed and,

a charge/discharge control unit determining a power target value in accordance with the request from the driver within a range of said control-specific charge/discharge allowable power set by said charge/discharge allowable power control unit, and feedback-controlling the electric power charged and discharged in said power storage unit in accordance with the power target value,

said charge/discharge control unit is configured to perform control for starting said internal combustion engine in response to a request at start-up of said hybrid vehicle within said range of said control-specific charge/discharge allowable power,

when performing said control for said internal combustion engine, said internal combustion engine is started by receiving the electric power supplied from said power storage unit and said driving force generation unit is operated in regenerative mode so as to reduce rattling noise,

said charge/discharge allowable power control unit setting said control-specific charge/discharge allowable power such that, at start-up of said vehicle, a maximum value of the charge/discharge power allowable in said power storage unit is set as an initial value and the control-specific charge/discharge allowable power is decreased from the initial value at a predetermined second change speed higher than said first change speed.

2. The hybrid vehicle according to claim 1, wherein

said first change speed is set below a change speed of the electric power charged and discharged in said power storage unit in accordance with said power target value, and

said second change speed is set higher than the change speed of the electric power charged and discharged in said power storage unit in accordance with said power target value.

3. A method of controlling a hybrid vehicle,

said hybrid vehicle including

an internal combustion engine,

a power generation unit capable of generating electric power by receiving power generated by an operation of said internal combustion engine,

a power storage unit configured to be chargeable by receiving the electric power from said power generation unit, and

a driving force generation unit generating a driving force of a vehicle by receiving the electric power supplied from said power storage unit,

said method of controlling the hybrid vehicle comprising the steps of:

detecting a state of charge and a temperature of said power storage unit;

calculating charge/discharge power allowable in said power storage unit based on the state of charge and the temperature of said power storage unit detected by said detecting step;

setting control-specific charge/discharge allowable power by correcting charge/discharge allowable power calculated by said calculating step so as to limit the charge/discharge allowable power to be changed at a predetermined first change speed; and

determining a power target value in accordance with a request from a driver within a range of said control-specific charge/discharge allowable power set by said setting step, and feedback-controlling the electric power charged and discharged in said power storage unit in accordance with the power target value,

said determining step including the step of performing control for starting said internal combustion engine in response to a request at start-up of said hybrid vehicle within a range of said control-specific charge/discharge allowable power,

when performing said control for said internal combustion engine, said internal combustion engine is started by receiving the electric power supplied from said power storage unit and said driving force generation unit is operated in regenerative mode so as to reduce rattling noise,

said setting step including the step of setting said control-specific charge/discharge allowable power such that, at start-up of said hybrid vehicle, a maximum value of the charge/discharge power allowable in said power storage unit is set as an initial value and the control-specific charge/discharge allowable power is decreased from the initial value at a predetermined second change speed higher than said first change speed.

4. The method of controlling a hybrid vehicle according to claim 3, wherein

said first change speed is set below a change speed of the electric power charged and discharged in said power storage unit in accordance with said power target value, and

said second change speed is set higher than the change speed of the electric power charged and discharged in said power storage unit in accordance with said power target value.