Altitude Compensation for Internal Combustion Engine
AssigneeJaguar Land Rover Limited
InventorPaul Darnell
Life of this patent
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Abstract
In order to address turbo lag at altitude, a vehicle boosts output torque of an internal combustion engine with electric motor torque generated from a battery. The residual charge of the battery is increased at altitude to provide a sufficient reserve for the corresponding increase in turbo lag. The invention is typically applied to a parallel hybrid vehicle.
Claims19
A method of determining the residual capacity of a battery of a vehicle having an internal combustion engine and a forced induction device, said battery being adapted to supplement output torque of said engine via a rotary electrical machine during a lag period of the forced induction device, said method comprising:
- determining a minimum capacity of said battery;
- and
- calculating a residual capacity above said minimum for providing supplemental torque to said engine via said electrical machine during the lag period, said residual capacity increasing with vehicle altitude.
A method of supplementing output torque of an internal combustion engine of a vehicle having a forced induction device and a battery powered rotary electrical machine, the method comprising:
- sensing that engine output torque is lower than the torque demanded by the driver of the vehicle during a lag period of the forced induction device;
- and
- supplementing engine torque with torque from the electric machine to provide a combined torque substantially equal to the torque demanded by the driver during the lag period;
- whereby said battery has a minimum capacity, and a residual capacity above said minimum, the residual capacity being increased at altitude.
A vehicle having an internal combustion engine, a battery, a rotary electric machine powered by the battery, a forced induction device and a control system adapted to limit the rotary output of the electric machine when the battery reaches a residual charge, the residual charge being above a minimum charge of the battery, wherein the control system is further adapted to increase the residual charge of the battery at altitude so as to provide an increased reserve of electrical energy for powering the electric machine during a lag period of the forced induction device.
Dependencies are inferred from the claim text.