Method and system for controlling downshift for hybrid vehicle
AssigneeHyundai Motor Company
InventorsSoo Bang LEE, Tai Jin JUNG
Life of this patent
Estimating the term…
Abstract
A method and system for controlling a downshift for a hybrid vehicle includes: determining whether a running mode of the hybrid vehicle is an electric vehicle (EV) mode; determining whether a kick-down occurs when the hybrid vehicle is in the EV mode, wherein the kick-down requires a downshift; operating an engine and performing a shift-start (SS) when a downshift condition according to the kick-down is satisfied; determining whether a speed of the engine and a speed of a motor are synchronized before performing an actual shift-begin (SB); engaging an engine clutch when the speed of the engine and the speed of the motor are synchronized; and performing the actual SB when the engine clutch is engaged.
Claims8
A method of controlling a downshift for a hybrid vehicle, comprising:
- determining whether a running mode of the hybrid vehicle is an electric vehicle (EV) mode;
- determining whether a kick-down occurs when the hybrid vehicle is in the EV mode, wherein the kick-down requires a downshift;
- operating an engine and performing a shift-start (SS) when a downshift condition according to the kick-down is satisfied;
- determining whether a speed of the engine and a speed of a motor are synchronized before performing an actual shift-begin (SB);
- engaging an engine clutch when the speed of the engine and the speed of the motor are synchronized;
- performing the actual SB when the engine clutch is engaged;
- and
- compensating a release hydraulic pressure for shifting between the SS and the actual SB based on an engagement hydraulic pressure of the engine clutch, the motor speed, and a slope of the motor speed.
(canceled)
A method of controlling a downshift for a hybrid vehicle, comprising:
- determining whether a running mode of the hybrid vehicle is an electric vehicle (EV) mode;
- determining whether a kick-down occurs when the hybrid vehicle is in the EV mode, wherein the kick-down requires a downshift;
- operating an engine and performing a shift start (SS) and an actual shift begin (SB) when a downshift condition according to the kick-down is satisfied;
- determining whether a speed of the engine and a speed of a motor are synchronized during the actual SB;
- engaging an engine clutch when the speed of the engine and the speed of the motor are synchronized;
- performing actual shifting to terminate an operation of the downshift when the engine clutch is engaged;
- and
- setting a target speed of the engine based on the motor speed and a slope of the motor speed during the actual SB.
(canceled)
8-9. (canceled)
Dependencies are inferred from the claim text.