Vehicle shifting control method

• US 9,878,704 B2
• Filed: 10/20/2016
• Issued: 01/30/2018
• Est. Priority Date: 06/09/2016
• Status: Active Grant

• Current Assignee: Hyundai Motor Company (Hyundai Motor Group)
• Original Assignee: Hyundai Motor Company (Hyundai Motor Group)
• Inventors: Lee, Chan Ho
• Primary Examiner(s): Holmes, Justin
• Application Number:
  US15/298,284
• Publication Number:
  US 20170355363A1
• Time in Patent Office: 467 Days
• Field of Search: None
• CPC Class Codes: B60K 6/48 Parallel type
• CPC Class Codes: B60W 20/30 Control strategies involving selection of transmission gear ratio control of change speed gearings, together with other vehicle sub-units B60W10/10; HEV transmission gearing B60K6/36; gearings and control thereof F16H
• CPC Class Codes: B60W 30/19 Improvement of gear change, e.g. by synchronisation or smoothing gear shift
• CPC Class Codes: F16H 61/04 Smoothing ratio shift
• CPC Class Codes: Y02T 10/62 Hybrid vehicles

Abstract

A shifting control method of a vehicle includes inhibiting, by a controller, a line pressure from being increased when the controller senses a power-off upshift condition of the vehicle, calculating, by the controller, a target speed of a motor after the inhibiting step, synchronizing, by the controller, the motor to the target speed after the calculating step, and increasing, by the controller, an oil pressure of an engagement side clutch of a transmission to complete shifting after the synchronizing step.

Claims

1. A shifting control method of a vehicle, comprising:

inhibiting, by a controller, a line pressure from being increased when the controller senses a power-off upshift condition of the vehicle;

calculating, by the controller, a target speed of a motor after the inhibiting step;

synchronizing, by the controller, the motor to the target speed after the calculating step; and

increasing, by the controller, an oil pressure of an engagement side clutch of a transmission to complete shifting after the synchronizing step.

2. The shifting control method of a vehicle of claim 1, further comprising:

determining, by the controller, whether the vehicle is in a power-off upshift stage based on a shifting state and an accelerator position sensor (APS) sensing value, prior to the increasing step.

3. The shifting control method of a vehicle of claim 1, wherein in the calculating step, the controller calculates the target speed of the motor based on a target shift stage and a vehicle speed.

4. The shifting control method of a vehicle of claim 1, wherein in the synchronizing step, the controller releases an engine clutch and then synchronizes the motor with the target speed.

5. The shifting control method of a vehicle of claim 1, wherein in the synchronizing step, the controller releases an oil pressure of a release side clutch of the transmission and then synchronizes the motor with the target speed.

6. The shifting control method of a vehicle of claim 1, wherein in the increasing step, the controller increases the oil pressure of the engagement side clutch for a set time.