Control device for hybrid vehicle

• US 9,975,541 B2
• Filed: 03/16/2017
• Issued: 05/22/2018
• Est. Priority Date: 03/25/2016
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Suzuki, Yoshitaka, Nakano, Masato
• Primary Examiner(s): Marc, McDieunel
• Application Number:
  US15/460,840
• Publication Number:
  US 20170274888A1
• Time in Patent Office: 432 Days
• Field of Search: 701 22
• CPC Class Codes: B60K 6/24 characterised by the combustion engines
• CPC Class Codes: B60K 6/26 characterised by the motors or the generators
• CPC Class Codes: B60K 6/28 characterised by the electric energy storing means, e.g. batteries or capacitors
• CPC Class Codes: B60K 6/365 with the gears having orbital motion
• CPC Class Codes: B60K 6/445 Differential gearing distribution type
• CPC Class Codes: B60K 6/46 Series type
• CPC Class Codes: B60L 2240/421 Speed
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 2240/52 related to converters
• CPC Class Codes: B60L 2240/549 Current
• CPC Class Codes: B60L 58/12 responding to state of charge [SoC]
• 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 20/40 Controlling the engagement or disengagement of prime movers, e.g. for transition between prime movers power-up or power-down of the driveline B60W30/192
• CPC Class Codes: B60W 2510/081 Speed
• CPC Class Codes: B60W 2510/244 Charge state
• CPC Class Codes: B60W 2540/10 Accelerator pedal position
• CPC Class Codes: B60W 2710/0644 Engine speed
• CPC Class Codes: B60W 2710/081 Speed
• CPC Class Codes: B60W 2710/083 Torque
• CPC Class Codes: B60W 2710/244 Charge state
• CPC Class Codes: B60W 50/0097 : Predicting future conditions
• CPC Class Codes: B60Y 2200/92 : Hybrid vehicles
• 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 10/72 : Electric energy management in electromobility
• CPC Class Codes: Y02T 10/92 : Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles
• CPC Class Codes: Y10S 903/905 : Combustion engine
• CPC Class Codes: Y10S 903/906 : Motor or generator
• CPC Class Codes: Y10S 903/907 : Electricity storage, e.g. battery, capacitor

Abstract

A control device for hybrid vehicle includes an electronic control unit. The electronic control unit is configured to: calculate required electric power required for a motor for electric power generation as electric power supplied to a motor for drive based on required drive power of the hybrid vehicle; calculate an electric power suppliable time of the capacitor; and determine a rotation speed increase standby time of the internal combustion engine such that rotation speed increase standby time becomes shorter than a spare time. The spare time is a time obtained by subtracting an electric power generation delay time from the electric power suppliable time. The electric power generation delay time is a time from a time of starting the rotation speed increase until a time of starting electric power generation of the motor for electric power generation.

Claims

1. A control device for hybrid vehicle, the hybrid vehicle including a motor for drive, a capacitor, a motor for electric power generation, and an internal combustion engine, the motor for drive being configured to generate power for traveling the vehicle, the capacitor being configured to supply stored electric power to the motor for drive, the motor for electric power generation being configured to supply generated electric power to the motor for drive, and the internal combustion engine being configured to output power causing the motor for electric power generation to generate electric power, the control device comprising:

an electronic control unit configured to;

calculate required electric power required for the motor for electric power generation as electric power supplied to the motor for drive based on required drive power of the hybrid vehicle;

calculate an electric power suppliable time of the capacitor, the electric power suppliable time being a time from a time of starting a requirement of the required electric power until a time when charging capacity of the capacitor decreases to target residual capacity; and

determine a rotation speed increase standby time of the internal combustion engine such that the rotation speed increase standby time becomes shorter than a spare time, the rotation speed increase standby time being a time from the time of starting the requirement of the required electric power until a time of starting a rotation speed increase, the time of starting the rotation speed increase being a time when the internal combustion engine, which is in a drive power non-generation state at the time of starting the requirement of the required electric power, starts rotation speed increase control for increasing the rotation speed for electric power generation of the motor for electric power generation, the spare time being a time obtained by subtracting an electric power generation delay time from the electric power suppliable time, and the electric power generation delay time being a time from the time of starting the rotation speed increase until a time of starting electric power generation of the motor for electric power generation.

2. The control device according to claim 1, wherein:

the electronic control unit is configured to calculate a required reaching time, the required reaching time being a time from the time of starting electric power generation until a time of reaching of the requirement when the generated electric power of the motor for electric power generation reaches the required electric power; and

the electronic control unit is configured to determine the rotation speed increase standby time such that the rotation speed increase standby time is equal to or less than a spare time obtained by subtracting the electric power generation delay time and the required reaching time from the electric power suppliable time.

3. The control device according to claim 1, wherein the electric power suppliable time includes a time for which the capacitor is able to supply the required electric power.

4. The control device according to claim 1, wherein the electronic control unit is configured to gradually decrease electric power supplied from the capacitor from the required electric power toward zero in conformity with an increase of the generated electric power of the motor for electric power generation from the time of starting electric power generation.

5. The control device according to claim 4, wherein the electric power suppliable time includes a time for which the capacitor is able to supply the required electric power and a time for which electric power supplied from the capacitor gradually decreases from the required electric power toward zero.

6. The control device according to claim 1, wherein:

the electronic control unit is configured to make the rotation speed increase standby time zero in a case where electric power to be output from the capacitor is less than the required electric power;

the electronic control unit is configured to calculate a required reaching time from the time of starting electric power generation until the time of reaching of the requirement when the generated electric power of the motor for electric power generation reaches the required electric power; and

the electronic control unit is configured to gradually decrease electric power supplied from the capacitor toward zero from the time of starting the requirement such that the electric power suppliable time becomes equal to or greater than a total time of the electric power generation delay time and the required reaching time.

7. The control device according to claim 1, wherein:

the hybrid vehicle includes a battery which is able to supply stored electric power to the motor for drive;

the capacitor is configured to supply electric power to the motor for drive in addition to electric power supplied from the battery; and

the electronic control unit is configured to calculate, as the required electric power, a shortage of electric power with electric power supplied from the battery with respect to electric power required for an output of the motor for drive implementing the required drive power of the hybrid vehicle.