Method and system for controlling starting of mild hybrid electric vehicle
AssigneesHyundai Motor Company, Kia Motors Corporation
InventorsJungsup Byun, Seungwoo Lee, Minkyu Han
Life of this patent
Estimating the term…
Abstract
A method for controlling starting of a mild hybrid vehicle includes receiving a starting-request signal and in response, increasing a rotation speed of the engine by driving the MHSG by electricity supplied from a battery. Status data of the mild hybrid vehicle for controlling starting of the engine is monitored to obtain an engine rotation speed from the status data and determine an injection-starting rotation speed based on the status data. When the engine rotation speed is greater than the injection-starting rotation speed, fuel injection of the engine is started.
Claims10
A method for controlling starting of a mild hybrid vehicle, comprising:
- receiving, by a controller, a starting-request signal;
- increasing, by the controller, a rotation speed of the engine by driving a mild hybrid starter-generator (MHSG) by electricity supplied from a battery, in response to receiving the starting-request signal;
- monitoring, by the controller, status data of the mild hybrid vehicle for controlling starting of the engine;
- obtaining, by the controller, an engine rotation speed from the status data;
- determining, by the controller, an injection-starting rotation speed based on the status data;
- determining, by the controller, whether the engine rotation speed is greater than the injection-starting rotation speed;
- and
- starting, by the controller, fuel injection of the engine when the engine rotation speed is greater than the injection-starting rotation speed,
- wherein determining the injection-starting rotation speed includes:
- determining, by the controller, a reference rotation speed based on a coolant temperature, a temperature of the battery, and a state of charge (SOC) of the battery;
- determining, by the controller, a predetermined rotation speed based on a vehicle speed and a position value of an accelerator pedal;
- and
- determining, by the controller, the injection-starting rotation speed based on the reference rotation speed, a temperature of the MHSG, and the predetermined rotation speed.
A system for controlling starting of a mild hybrid vehicle, comprising:
- a vehicle controller configured to receive a start-request signal and in response, increase a rotation speed of an engine by driving a mild hybrid starter-generator (MHSG) by electricity supplied from a battery;
- and
- a data detection unit configured to detect status data to control starting of the mild hybrid vehicle,
- wherein the vehicle controller is further configured to:
- retrieve an available power of the battery corresponding with the temperature of the battery and the SOC of the battery from a predetermined power table;
- and
- retrieve the reference rotation speed corresponding with the coolant temperature and the available power of the battery from a predetermined control table,
- wherein the vehicle controller is configured to,
- monitor the status data of the mild hybrid vehicle detected by the data detection unit,
- obtain an engine rotation speed from the status data;
- determine an injection-starting rotation speed based on the status data;
- determine whether the engine rotation speed is greater then the injection-starting rotation speed;
- and
- start fuel injection of the engine when the engine rotation speed is greater than the injection-starting rotation speed.
Dependencies are inferred from the claim text.