US 12,630,023 B2Granted

Method of implementing engine braking using a virtual gear shift system of an electric vehicle

AssigneesHyundai Motor Company, Kia Corporation

InventorsSeong-Ho Kim, Seong-Ik Park, Sang-Won Oh

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Abstract

A method of implementing engine braking using a virtual gear shift (VGS) system of an electric vehicle (EV), which is connected with a VGS mode torque profile map, performs power-off down shift control by turning a VGS function on in response to an accelerator position scope (APS) off signal and a paddle shift signal. The method performs shift progress using a gear shift feeling torque compensating for a torque difference between a target gear shift stage and a current gear shift stage of the VGS. The method also controls vehicle deceleration to allow an amount of regenerative braking to increase using a target coasting torque as a gear is shifted to a lower gear shift stage to implement an engine braking feeling due to an increase in a deceleration feeling after the gear is shift.

Claims8

Dependent claims

A method of implementing virtual engine braking of an electric vehicle in a virtual gear shift (VGS) of the electric vehicle when a VGS function of a VGS system is turned on, the method comprising:

during a virtual power-off down shift (PowerOFF DownShift) control, decelerating the electric vehicle through virtual engine brake control by a coasting torque profile for each virtual gear shift stage, which is mapped to a drive mode of the VGS system;
and
providing VGS information and displaying on a cluster a virtual engine status according to the deceleration of the electric vehicle,
wherein the virtual engine brake control is configured to:
set, by a controller, a gear shift feeling torque (ShiftFeel Torque) based on a torque difference between a virtual target gear shift stage and a virtual current gear shift stage of the VGS on a gear shift feeling torque line (ShiftFeel Torque Line) for the VGS of the coasting torque profile for each virtual gear shift stage;
perform shift progress to the virtual target gear shift stage by the gear shift feeling torque (ShiftFeel Torque) and perform regenerative braking of a motor by a target coasting torque (Target Coasting Tq) of the virtual target gear shift stage;
and
decelerate the vehicle through the shift progress, and
wherein a relationship between the gear shift feeling torque (ShiftFeel Torque) and the target coasting torque (Target Coasting Tq) gradually increases an amount of the regenerative braking of the motor to increase to the target coasting torque (Target Coasting Tq) as a gear is shifted to a lower virtual gear shift stage after the gear shift feeling torque control (ShiftFeel Torque Control) command is activated.

6 more elements

An electric vehicle (EV), comprising:

a virtual gear shift (VGS) system configured to:
perform virtual power-off down shift (PowerOFF DownShift) control by turning a VGS function on in response to an accelerator position scope (APS) off signal and a paddle shift signal,
perform shift progress using a gear shift feeling torque (ShiftFeel Torque) compensating for a torque difference between a virtual target gear shift stage and a virtual current gear shift stage of the VGS, and
control vehicle deceleration to increase an amount of regenerative braking using a target coasting torque (Target Coasting Tq) as a gear is shifted to a lower virtual gear shift stage;
an accelerator pedal configured to generate the APS off signal;
a paddle shift configured to generate the paddle shift signal;
a motor configured to generate power to drive the EV;
and
a control configured to:
set, by a controller, a gear shift feeling torque (ShiftFeel Torque) based on a torque difference between the virtual target gear shift stage and the virtual current gear shift stage of the VGS on a gear shift feeling torque line (ShiftFeel Torque Line) for the VGS of the coasting torque profile for each virtual gear shift stage;
perform shift progress to the virtual target gear shift stage by the gear shift feeling torque (ShiftFeel Torque) and perform regenerative braking of a motor by a target coasting torque (Target Coasting Tq) of the virtual target gear shift stage;
and
decelerate the vehicle through the shift progress, and
wherein a relationship between the gear shift feeling torque (ShiftFeel Torque) and the target coasting torque (Target Coasting Tq) gradually increases an amount of the regenerative braking of the motor to increase to the target coasting torque (Target Coasting Tq) as a gear is shifted to a lower virtual gear shift stage after the gear shift feeling torque control (ShiftFeel Torque Control) command is activated.

11 more elements

Dependencies are inferred from the claim text.