Shift control apparatus and shift control method of automatic transmission

Patent metadata

Field	Value
Publication number	US-9709161-B2
Application number	US-201414557717-A
Country	US
Kind code	B2
Filing date	Dec 2, 2014
Priority date	Sep 22, 2014
Publication date	Jul 18, 2017
Grant date	Jul 18, 2017

Abstract

A shift control apparatus of an automatic transmission may include a data detector configured to detect driving data to perform a shift control, and a vehicle controller configured to determine a shift gear stage based on the driving data and control a transmission based on the shift gear stage, in which the vehicle controller sets driver's demand acceleration based on the driving data, sets a gear stage range which arrives at the driver's demand acceleration, and sets a target gear stage, at which fuel consumption is minimized, in the gear stage range to instruct a shift.

First claim

What is claimed is:

1. A shift control apparatus of an automatic transmission, comprising:
a data detector configured to detect driving data to perform a shift control; and
a vehicle controller configured to determine a shift gear stage based on the driving data and control a transmission based on the shift gear stage,
wherein the vehicle controller sets driver's demand acceleration based on the driving data, sets a gear stage range which arrives at the driver's demand acceleration, and sets a target gear stage, at which fuel consumption is minimized, in the gear stage range to instruct a shift,
wherein the vehicle controller sets a basic demand acceleration map representing a demand acceleration for a vehicle speed and a position of an accelerator pedal and applies weight values for a change rate of the position of the accelerator pedal and a road gradient condition, respectively, of the driving data to the basic demand acceleration map to define a driver's demand acceleration map, and
wherein the vehicle controller extracts the demand acceleration matching the vehicle speed and the position of the accelerator pedal of the driving data from the driver's demand acceleration map to set the driver's demand acceleration.

2. The shift control apparatus of claim 1 , wherein the vehicle controller sets the gear stage range which arrives at the driver's demand acceleration among all the gear stages on an acceleration map representing vehicle speeds and accelerations arriving at each of a plurality of gear stages of a vehicle based on a current gear stage.

3. The shift control apparatus of claim 1 , wherein the vehicle controller sets the target gear stage, at which fuel consumption is minimized, on a brake specific fuel consumption (BSFC) map representing fuel consumption rate information in a contour form.

4. The shift control apparatus of claim 1 , wherein the vehicle controller sets the target gear stage, delays the shift during a delay time, and then controls the transmission to perform the shift based on the target gear stage.

5. The shift control apparatus of claim 1 , wherein the driving data includes at least one of a vehicle speed, a position of an accelerator pedal, a change rate of the position of the accelerator pedal, a vehicle acceleration, a road gradient condition, and a driving condition classifying table.

6. A shift control method of an automatic transmission, comprising:
defining a driver's demand acceleration map by a vehicle controller for a vehicle speed and a position of an accelerator pedal based on driving data;
setting a driver's demand acceleration by the vehicle controller depending on the driving data using the driver's demand acceleration map;
setting a gear stage range by the vehicle controller arriving at the driver's demand acceleration among all the gear stages based on a current gear stage of a vehicle;
setting a target gear stage by the vehicle controller, at which fuel consumption is minimized, in the gear stage range; and
performing a shift based on the target gear stage,
wherein the defining of the driver's demand acceleration map includes:
setting a basic demand acceleration map by the vehicle controller representing the demand acceleration for the vehicle speed and the position of the accelerator pedal; and
applying a weight value by the vehicle controller for at least one of a change rate of the position of the accelerator pedal and a road gradient condition of the driving data to the basic demand acceleration map to define the driver's demand acceleration map, and

wherein in the setting of the driver's demand acceleration,
the demand acceleration matching the vehicle speed and the position of the accelerator pedal of the driving data is extracted from the driver's demand acceleration map and is set.

7. The shift control method of claim 6 , wherein the setting of the driver's demand acceleration includes:
determining whether the position of the accelerator pedal of the driving data is equal to or more than a correction variable; and
setting the driver's demand acceleration when the position of the accelerator pedal of the driving data is less than the correction variable.

8. The shift control method of claim 6 , wherein in the setting of the gear stage range,
the gear stage range arriving at the driver's demand acceleration among all the gear stages is set on an acceleration map representing vehicle speeds and accelerations arriving at each of a plurality of gear stages of the vehicle based on the current gear stage.

9. The shift control method of claim 6 , wherein the setting of the target gear stage includes:
determining a fuel consumption minimum point at which fuel consumption is minimized, in the gear stage range on a brake specific fuel consumption (BSFC) map representing fuel consumption rate information in a contour form; and
confirming a gear stage corresponding to the fuel consumption minimum point to set the target gear stage.

10. The shift control method of claim 6 , wherein in the performing of the shift based on the target gear stage, performing the shift based on the target gear stage after the shift is delayed for a delay time.

11. The shift control method of claim 6 , wherein the driving data includes at least one of the vehicle speed, the position of the accelerator pedal, a change rate of the position of the accelerator pedal, a vehicle acceleration, a road gradient condition, and a driving condition classifying table.

12. A shift control method of an automatic transmission, comprising:
setting a basic demand acceleration map, by a vehicle controller, representing a demand acceleration for a vehicle speed and a position of an accelerator pedal;
detecting driving data, by the vehicle controller, for performing a shift control;
applying a weight value, by the vehicle controller, for the driving data to the basic demand acceleration map to define a driver's demand acceleration map;
setting driver's demand acceleration, by the vehicle controller, depending on the driving data using the driver's demand acceleration map;
setting a gear stage range by the vehicle controller, arriving at the driver's demand acceleration among all the gear stages based on a current gear stage of the vehicle on an acceleration map;
setting a target gear stage, by the vehicle controller, at which fuel consumption is minimized, in the gear stage range on a brake specific fuel consumption (BSFC) map; and
performing a shift by the vehicle controller, based on the target gear stage,
wherein in the setting of the driver's demand acceleration,
the demand acceleration matching the vehicle speed and the position of the accelerator pedal of the driving data is extracted from the driver's demand acceleration map.

13. The shift control method of claim 12 , wherein in the performing of the shift based on the target gear stage,
the shift is performed based on the target gear stage after the shift is delayed for a predetermined delay time.

14. The shift control method of claim 12 , wherein the acceleration map represents the vehicle speed and the acceleration which arrive at each of a plurality of gear stages of the vehicle.

15. The shift control method of claim 12 , wherein the driving data includes at least one of the vehicle speed, the position of the accelerator pedal, a change rate of the position of the accelerator pedal, a vehicle acceleration, a road gradient condition, and a driving condition classifying table.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Kim Beomsoo

Classifications

• F16H2059/663

  Road slope · CPC title

• F16H59/70

  dependent on the ratio established · CPC title

• F16H61/10

  Controlling shift hysteresis · CPC title

• F16H2061/0015

  Transmission control for optimising fuel consumptions · CPC title

• F16H59/48

  Inputs being a function of acceleration · CPC title