Apparatus and method for estimating engine power

Patent metadata

Field	Value
Publication number	US-9500149-B2
Application number	US-201414564734-A
Country	US
Kind code	B2
Filing date	Dec 9, 2014
Priority date	Oct 14, 2014
Publication date	Nov 22, 2016
Grant date	Nov 22, 2016

Abstract

Provided is an engine power estimation apparatus for estimating an engine power at a gear shift completion time when making a speed change of a vehicle. The engine power estimation apparatus includes a gear shift detection unit configured to detect the speed change of the vehicle; an axle speed estimation unit configured to calculate a target axle speed at the gear shift completion time, using an axle speed and a gear shift time learning value, when the speed change of the vehicle is detected; and an engine power estimation unit configured to calculate a target engine power at the gear shift completion time, using the target axle speed and engine load information.

First claim

What is claimed is:

1. An engine power estimation apparatus for estimating an engine power at a gear shift completion time when making a speed change of a vehicle, comprising:
a gear shift detection unit configured to detect the speed change of the vehicle;
an axle speed estimation unit configured to calculate a target axle speed at the gear shift completion time, using an axle speed and a gear shift time learning value, when the speed change of the vehicle is detected; and
an engine power estimation unit configured to calculate a target engine power at the gear shift completion time, using the target axle speed and engine load information.

2. The engine power estimation apparatus of claim 1 , wherein the gear shift detection unit detects a gear shift operation of a driver by considering one or more of an accelerator pedal displacement value, a brake pedal displacement value, and a throttle valve opening degree, and detects whether the speed of the vehicle was changed according to the gear shift operation of the driver, by considering a speed of the vehicle.

3. The engine power estimation apparatus of claim 1 , wherein the axle speed estimation unit calculates an estimated change of the axle speed up to the gear shift completion time by applying a previously measured gear shift time learning value to a change rate of the axle speed, and calculates a target axle speed at the gear shift completion time by adding the estimated change rate of the axle speed and a current value of the axle speed.

4. The engine power estimation apparatus of claim 1 , wherein the engine power estimation unit comprises:
a first calculation process of calculating a target turbine speed using the target axle speed and a gear ratio;
a second calculation process of calculating a target engine speed using the target turbine speed and a torque convert multiplication ratio; and
a third calculation process of calculating a target engine power using the target engine speed and an engine torque.

5. The engine power estimation apparatus of claim 1 , further comprising a gear shift control signal output unit configured to determine a target gear shift stage according to the target engine power, and output a gear shift control signal for shifting a gear to the determined target gear shift stage.

6. The engine power estimation apparatus of claim 5 , wherein the gear control signal output unit determines the target gear shift stage by considering one or more of a speed of the vehicle, an accelerator pedal displacement value, a brake pedal displacement value, and a throttle valve opening degree, based on the target engine power.

7. An engine power estimation method for estimating an engine power at a gear shift completion time during a speed change of a vehicle, comprising:
detecting the speed change of the vehicle;
calculating a target axle speed at the gear shift completion time, using an axle speed and a gear shift time learning value, when the speed change of the vehicle is detected; and
calculating a target engine power at the gear shift completion time, using the target axle speed and engine load information.

8. The engine power estimation method of claim 7 , wherein the detecting of the speed change of the vehicle comprises:
detecting a gear shift operation of a driver by considering one or more of an accelerator pedal displacement value, a brake pedal displacement value, and a throttle valve opening degree; and
detecting whether the speed of the vehicle was changed according to the gear shift operation of the driver, by considering a speed of the vehicle.

9. The engine power estimation method of claim 7 , wherein the calculating of the target axle speed at the gear shift completion time comprises:
calculating an estimated change of the axle speed up to the gear shift completion time by applying a previously measured gear shift time learning value to a change rate of the axle speed; and
calculating a target axle speed at the gear shift completion time by adding the estimated change of the axle speed and a current value of the axle speed.

10. The engine power estimation method of claim 7 , wherein the calculating of the target engine power at the gear shift completion time comprises:
calculating a target turbine speed using the target axle speed and a gear ratio;
calculating a target engine speed using the target turbine speed and a torque converter multiplication ratio; and
calculating a target engine power using the target engine speed and an engine torque.

11. The engine power estimation method of claim 7 , further comprising:
determining a target gear shift stage according to the target engine power; and
outputting a gear shift control signal for shifting a gear to the determined target gear shift stage.

12. The engine power estimation method of claim 11 , wherein the determining of the target gear shift stage according to the target engine power comprises determining the target gear shift stage by considering one or more of a speed of the vehicle, an accelerator pedal displacement value, a brake pedal displacement value, and a throttle, valve opening value, based on the target engine power.

Assignees

• Hyundai Autron Co Ltd

Inventors

• Son Se-Hoon
• Shin Chang-Kyu
• Lim Kwang-Hyuk
• Choi Jong-Ik

Classifications

• F02D41/023 Primary

  in relation with the gear ratio shifting (conjoint control for improving gear change B60W30/19) · CPC title

• F02D41/045

  Detection of accelerating or decelerating state (detection thereof in general G01P) · CPC title

• F02D2200/501

  Vehicle speed · CPC title

• F02D2200/602

  Pedal position · CPC title

• F16H63/502

  for smoothing gear shifts · CPC title