Hybrid vehicle

• US 10,259,446 B1
• Filed: 09/10/2018
• Issued: 04/16/2019
• Est. Priority Date: 10/16/2017
• Status: Expired due to Fees

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Shimizu, Yu
• Primary Examiner(s): Restifo, Jeffrey J
• Application Number:
  US16/125,927
• Publication Number:
  US 20190111909A1
• Time in Patent Office: 218 Days
• Field of Search: 180 65285, 180 6529, 180 658
• CPC Class Codes: B60K 6/26 characterised by the motors or the generators
• CPC Class Codes: B60K 6/365 with the gears having orbital motion
• CPC Class Codes: B60K 6/442 Series-parallel switching type
• CPC Class Codes: B60K 6/445 Differential gearing distribution type
• CPC Class Codes: B60L 15/20 for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
• CPC Class Codes: B60L 2210/10 DC to DC converters
• CPC Class Codes: B60L 2210/40 DC to AC converters
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 2240/525 Temperature of converter or components thereof
• CPC Class Codes: B60L 2240/526 Operating parameters
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• CPC Class Codes: B60L 50/61 by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles
• 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 20/10 Controlling the power contribution of each of the prime movers to meet required power demand
• CPC Class Codes: B60W 20/15 Control strategies specially adapted for achieving a particular effect
• CPC Class Codes: B60W 2510/085 Power
• CPC Class Codes: B60W 2510/087 Temperature
• CPC Class Codes: B60W 2530/00 Input parameters relating to vehicle conditions or values, not covered by groups B60W2510/00 or B60W2520/00
• CPC Class Codes: B60W 2540/10 Accelerator pedal position
• CPC Class Codes: B60W 2710/30 : Auxiliary equipments
• CPC Class Codes: B60W 30/1843 : Overheating of driveline components B60W30/186 takes precedence
• CPC Class Codes: B60Y 2200/92 : Hybrid vehicles
• CPC Class Codes: B60Y 2300/192 : Power-up or power-down of the driveline, e.g. start up of a cold engine
• CPC Class Codes: B60Y 2300/60 : Control of electric machines, e.g. problems related to electric motors or generators
• CPC Class Codes: F16H 3/724 : using external powered electric machines
• CPC Class Codes: H02M 1/007 : Plural converter units in cascade push-pull DC/DC converters with pre-regulator H02M3/3374; DC-AC converters following a DC-DC stage including a high frequency transformer H02M7/4807; DC-AC converters following a DC-DC conversion stage generating periodically varying voltages H02M7/4826
• CPC Class Codes: H02M 1/008 : Plural converter units for generating at two or more independent and non-parallel outputs, e.g. systems with plural point of load switching regulators
• CPC Class Codes: H02M 1/327 : against abnormal temperatures
• CPC Class Codes: H02M 3/158 : including plural semiconductor devices as final control devices for a single load
• CPC Class Codes: H02M 7/797 : using semiconductor devices only
• CPC Class Codes: Y02T 10/62 : Hybrid vehicles
• CPC Class Codes: Y02T 10/64 : Electric machine technologies in electromobility
• 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
• CPC Class Codes: Y02T 10/72 : Electric energy management in electromobility

Abstract

During a predetermined drive in which a hybrid vehicle is driven with shutting off gates of a first inverter and a second inverter and operating an engine, the hybrid vehicle controls the engine and a step-up/down converter, such that a reverse voltage of a first motor is higher than a voltage of a high voltage-side power line. In the event of an increase in an operation amount of an accelerator during the predetermined drive, the hybrid vehicle controls the engine and the step-up/down converter to limit an increment of a difference between the reverse voltage of the first motor and the voltage of the high voltage-side power line when a temperature of the step-up/down converter is equal to or higher than a predetermined temperature, compared with an increment of the difference when the temperature of the step-up/down converter is lower than the predetermined temperature.

Claims

1. A hybrid vehicle, comprising:

an engine;

a first motor configured to generate a reverse voltage by rotation;

a planetary gear configured to include three rotational elements respectively connected with three axes of the first motor, the engine, and a driveshaft coupled with drive wheels, such that the first motor, the engine and the driveshaft are aligned in this sequence in an alignment chart;

a second motor configured to input and output power into and from the driveshaft;

a first inverter configured to drive the first motor;

a second inverter configured to drive the second motor;

a power storage device;

a step-up/down converter connected with a low voltage-side power line, which the power storage device is connected with, and with a high voltage-side power line, which the first inverter and the second inverter are connected with, and configured to transmit electric power between the low voltage-side power line and the high voltage-side power line with regulation of a voltage of the high voltage-side power line; and

a control device configured to control the engine and the step-up/down converter such that a reverse voltage of the first motor is higher than the voltage of the high voltage-side power line, during a predetermined drive in which the hybrid vehicle is driven with shutting off gates of the first inverter and the second inverter and operating the engine, wherein

in an event of an increase in an operation amount of an accelerator during the predetermined drive, the control device controls the engine and the step-up/down converter to limit an increment of a difference between the reverse voltage of the first motor and the voltage of the high voltage-side power line when a temperature of the step-up/down converter is equal to or higher than a predetermined temperature, compared with an increment of the difference when the temperature of the step-up/down converter is lower than the predetermined temperature.

2. The hybrid vehicle according to claim 1,

wherein in the event of the increase in the operation amount of the accelerator during the predetermined drive, when the temperature of the step-up/down converter is equal to or higher than the predetermined temperature, the control device controls the engine and the step-up/down converter to keep the difference unchanged.

3. The hybrid vehicle according to claim 2,

wherein in the event of the increase in the operation amount of the accelerator during the predetermined drive, when the temperature of the step-up/down converter is equal to or higher than the predetermined temperature, the control device controls the engine and the step-up/down converter to keep a rotation speed of the first motor and the voltage of the high voltage-side power line unchanged, so as to keep the difference unchanged.