Method of determining engine output power in a hybrid electric vehicle
First Claim
1. A method of determining an engine output power for a vehicle, comprising:
- determining a grade-based engine output power for the vehicle;
determining a speed-based engine output power, wherein a speed-based engine output power is determined as a function of a speed of the vehicle; and
selecting the output power of the engine from the grade-based engine output power and the speed-based engine output power.
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Abstract
This novel silent operating mode for a hybrid electric vehicle (HEV) reduces noise and emissions compared to traditional HEV operating modes. It is a complementary series of software control functions that allows the vehicle to operate with reduced noise and emissions where specifically needed, while phasing-in engine power where allowed. The method utilizes an energy storage system budget associated with a modal quantity of energy allocated for the mode, and is adapted to automatically adjust the operation of the vehicle to accommodate deviations from the budgeted energy amount. The method which implements the mode also adjusts the vehicle operation in conjunction with changes in the parametric conditions of the ESS, including the selective use of the engine output power. In particular, the silent operating mode comprises a method of selecting an engine output power from a speed-based engine output power and a grade-based engine output power. The grade-based engine output power may be determined from a plurality of vehicle state parameters.
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Citations
34 Claims
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1. A method of determining an engine output power for a vehicle, comprising:
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determining a grade-based engine output power for the vehicle;
determining a speed-based engine output power, wherein a speed-based engine output power is determined as a function of a speed of the vehicle; and
selecting the output power of the engine from the grade-based engine output power and the speed-based engine output power. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of determining an engine output power for a vehicle powertrain system comprising an internal combustion engine, an electric machine that is operatively coupled to an energy storage system that is adapted to receive electric power from and provide electric power to the electric machine, and a transmission that is operatively coupled to the electric machine and the engine and adapted to transmit power received from one or both of them, and that is adapted for operation in a silent mode in which it is preferred that the primary power to transmission be received from the electric machine and in which the engine output power is limited to a value that is substantially less than a maximum output power of the engine, the method implemented as a computer control algorithm in a vehicle controller, comprising:
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determining a grade-based engine output power for the vehicle;
determining a speed-based engine output power, wherein a speed-based engine output power is determined as a function of a speed of the vehicle; and
selecting the output power of the engine from the grade-based engine output power and the speed-based engine output power. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A method of providing a silent mode of operation for a hybrid electric vehicle having a rechargeable energy storage system (ESS), comprising the steps of:
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(1) transmitting a silent mode initiation request to a silent mode controller;
(2) comparing an actual value of at least one state parameter of the ESS that is indicative of the availability of the ESS for implementing the silent mode to at least one silent mode initiation limit value associated with the actual value, wherein if the actual value of the at least one state parameter compared to the associated at least one mode initiation limit value indicates that the silent mode is allowed, the method proceeds to step (3), and wherein if the actual value of the at least one state parameter indicates that the silent mode is not allowed, step (2) is repeated so long as the silent mode initiation request is being transmitted;
(3) transmitting a silent mode activation request to the silent mode controller;
(4) operating the vehicle in the silent mode using the silent mode controller, comprising designating an electric drive motor as a primary source of propulsion energy for the vehicle and designating an engine as a secondary source of the propulsion energy for the vehicle, wherein a modal quantity of energy in the ESS is allocated for use by the electric drive motor during the silent mode and the engine is used to make up the difference between the modal quantity of energy and a total vehicle propulsion energy requirement during the silent mode;
(5) limiting an output power of the engine while the vehicle is in the silent mode to a silent mode output power that is less than a maximum output power of the engine; and
(6) terminating the silent mode in response to the occurrence of a mode termination event. - View Dependent Claims (30, 31, 32, 33, 34)
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Specification