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US 9,956,953 B2Granted
Apparatus and method for controlling engine of hybrid vehicle
AssigneeHyundai Motor Company
InventorSang Joon Kim
Life of this patent
Estimating the term…
Abstract
A method of controlling an engine of a hybrid vehicle includes steps of calculating a maximum torque of an engine at which an engine lambda=1 is maintained; calculating a maximum dischargeable torque of a driving motor; and allowing an operation of the engine having the engine lambda<1 when a torque required by a driver is greater than a sum of the maximum torque of the engine at which the engine lambda=1 is maintained and the maximum dischargeable torque of the driving motor.
Claims6
A method of controlling an engine of a hybrid vehicle, comprising steps of:
- calculating a maximum torque of an engine at which an engine lambda equal to 1 is maintained;
- calculating a maximum dischargeable torque of a driving motor;
- and
- allowing an operation of the engine having an engine lambda less than 1 when a torque required by a driver is greater than a sum of the maximum torque of the engine at which the engine lambda equal to 1 is maintained and the maximum dischargeable torque of the driving motor,
- wherein the operation of the engine having the engine lambda less than 1 is allowed when the torque required by the driver is larger than a value obtained by adding a value obtained by multiplying the maximum dischargeable torque of the driving motor and a weighting factor for each state of charging (SOC) of a battery to the maximum torque of the engine at which the engine lambda equal to 1 is maintained,
- wherein the weighting factor for each SOC of the battery is set to a smaller value in a low level region, in which the SOC of the battery is equal to or smaller than a threshold value, than that in a high level region, in which the SOC of the battery is larger than the threshold value, such that the engine operates with the engine lambda less than 1 and at the same time the battery is charged by means of driving the motor.
3 more elements
An apparatus for controlling an engine of a hybrid vehicle, comprising:
- an engine clutch arranged between an engine and a motor and configured to transmit or block power of the engine;
- an automatic transmission configured to shift and output power of the engine or power of the engine and the motor to the wheels;
- an inverter configured to control the motor and to control power generation;
- a high voltage battery connected to the inverter and configured to be chargeable and dischargeable so that power is provided to the motor;
- and
- a control unit configured to calculate a maximum torque of the engine at which an engine lambda equal to 1 is maintained and a maximum dischargeable torque of the motor, and allow an operation of the engine having an engine lambda less than 1 when a torque required by a driver is larger than a sum of the maximum torque of the engine at which the engine lambda equal to 1 is maintained and the maximum dischargeable torque of the motor,
- wherein the control unit allows the operation of the engine having the engine lambda less than 1 when the torque required by the driver is larger than a value obtained by adding a value obtained by multiplying the maximum dischargeable torque of the driving motor and a weighting factor for each state of charging (SOC) of a battery to the calculated maximum torque of the engine at which the engine lambda equal to 1 is maintained,
- wherein the weighting factor for each SOC of the battery is set to a smaller value in a low level region where the SOC of the battery is equal to or smaller than a threshold value than that in a high level region where the SOC of the battery is larger than the threshold value, such that the engine operates with the engine lambda less than 1 and at the same time the battery is charged by means of driving the motor.
5 more elements
Dependencies are inferred from the claim text.