Engine control device and method of hybrid vehicle

Patent metadata

Field	Value
Publication number	US-9856815-B2
Application number	US-201514945092-A
Country	US
Kind code	B2
Filing date	Nov 18, 2015
Priority date	Sep 2, 2015
Publication date	Jan 2, 2018
Grant date	Jan 2, 2018

Abstract

An engine control method of a hybrid vehicle for controlling the engine depending on an engine load of the hybrid vehicle includes: learning a change amount of an engine load; determining at least one engine torque depending on a magnitude of the engine load; calculating an optimum torque value by using the learned change amount of the engine load and at least one determined engine torque; and controlling the engine by using the calculated optimum torque value.

First claim

What is claimed is:

1. A method for controlling an engine depending on an engine load of a hybrid vehicle, comprising:
learning a change amount of an engine load by a learning unit;
determining by a torque determining unit at least one engine torque depending on a magnitude of the engine load;
calculating by a control unit an optimum torque value by using the learned change amount of the engine load and at least one determined engine torque; and
controlling the engine by using the calculated optimum torque value,
wherein the learning of the change amount of the engine load includes learning a deviation of a friction torque in an idle state, and
wherein the determining of the at least one engine torque comprises:
determining a first engine torque when the engine load is a minimum; and
determining a second engine torque when the engine load is a maximum.

2. The method of claim 1 , wherein the calculating of the optimum torque value includes calculating the optimum torque value by using the deviation of the friction torque, a predetermined maximum value of the friction torque deviation, the first engine torque, and the second engine torque.

3. The method of claim 2 , wherein the controlling the engine comprises:
measuring the engine load; and
summing the measured engine load and the calculated optimum torque value while the hybrid vehicle is driven to calculate an output torque of the engine and to control the engine by the calculated output torque.

4. An engine control device of a hybrid vehicle, comprising:
a learning unit configured to learn a change amount of an engine load;
a torque determining unit configured to determine at least one engine torque depending on a magnitude of the engine load; and
a control unit configured to calculate an optimum torque value by using the learned change amount of the engine load and the at least one determined engine torque and control an output torque of the engine by using the magnitude of the engine load and the optimum torque value while the hybrid vehicle is driven,
wherein the control unit comprises:
an optimum torque calculation unit configured to calculate the optimum torque value of the engine by using the learned change amount of the engine load and the at least one determined engine torque; and
an output torque calculation unit configured to calculate the output torque of the engine by summing the engine load and the calculated optimum torque value,

wherein the learning unit is configured to learn a deviation of a friction torque in an idle state, and
wherein the torque determining unit comprises:
a first torque determining unit configured to determine a first engine torque when the engine load is a minimum; and
a second torque determining unit configured to determine a second engine torque when the engine load is a maximum.

5. The engine control device of claim 4 , wherein the optimum torque calculation unit is configured to calculate the optimum torque value by using the deviation of the friction torque, a predetermined maximum value of the friction torque deviation, the first engine torque, and the second engine torque.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Park Il Kwon
• Cho In Eok

Classifications

• B60W10/06

  including control of combustion engines · CPC title

• F02D41/1406

  with use of a optimisation method, e.g. iteration · CPC title

• F02D2200/1006

  Engine torque losses, e.g. friction or pumping losses or losses caused by external loads of accessories · CPC title

• Y02T10/6286

  Cross-Sectional Technologies · mapped topic

• F02D2200/1002

  Output torque · CPC title