Method for controlling the operation of a range extender for a hybrid electric vehicle
First Claim
1. A method for controlling the operation of a range extender for a hybrid electric vehicle having a battery system providing electric power to an electric drive system, said range extender comprising an internal combustion engine driving an alternator to provide a requested electric power supplementing the electric power provided by the battery system to increase the range of the hybrid electric vehicle, said method comprising the step of:
- detecting a state-of-charge of the battery system to generate a state-of-charge signal having a value corresponding to a percentage of a full charge;
detecting the electric power being consumed by the electric drive system to generate a consumed power signal pcon in response to said state-of-charge signal being less than a first predetermined value;
detecting the electric power being delivered by said range extender to generate a delivered power signal Pdel in response to said state-of-charge signal being less than said first predetermined value;
generating a requested power signal Preq in response to said consumed power signal Pcon being greater than said delivered power signal Pdel by a predetermined difference, said requested power signal, Preq having a new value causing said range extender to deliver sufficient electric power to said electric drive system and to said battery system to maintain the state-of-charge of said battery system within a preselected state-of-charge range;
activating said range extender to to deliver electric power having a value corresponding o the new value of said requested power signal Preg tending to maintain the difference between said consumed electric power and said delivered electric power to a value less than said predetermined difference; and
repeating said step of detecting said state-of-charge through said step of activating said range extender until said state-of-charge is greater than a second predetermined value.
2 Assignments
0 Petitions
Accused Products
Abstract
A method for controlling the operation of a range extender of a hybrid electric vehicle in which a requested power signal Preq is generated in response to the state-of-charge of the battery system being less than a predetermined intermediate value and the energy being consumed by the electric drive system being greater than the electric energy being delivered by the range extender. The requested power signal having a value approximately equal to the average power consumed by the electric drive system in a preceding time period. The method is responsive to the motor being in a energy regenerative state to decrease the power being generated by the range extender so that all the energy being generated by the motor is used to charge the battery. The method is also responsive to the engine temperature exceeding a predetermined temperature to reduce the power being delivered by the range extender. The power delivered by the range extender in response to the requested power signal is applied to the electric drive system and battery system to maintain the state-of-charge of the battery system is maintained within a predetermined range.
123 Citations
15 Claims
-
1. A method for controlling the operation of a range extender for a hybrid electric vehicle having a battery system providing electric power to an electric drive system, said range extender comprising an internal combustion engine driving an alternator to provide a requested electric power supplementing the electric power provided by the battery system to increase the range of the hybrid electric vehicle, said method comprising the step of:
-
detecting a state-of-charge of the battery system to generate a state-of-charge signal having a value corresponding to a percentage of a full charge; detecting the electric power being consumed by the electric drive system to generate a consumed power signal pcon in response to said state-of-charge signal being less than a first predetermined value; detecting the electric power being delivered by said range extender to generate a delivered power signal Pdel in response to said state-of-charge signal being less than said first predetermined value; generating a requested power signal Preq in response to said consumed power signal Pcon being greater than said delivered power signal Pdel by a predetermined difference, said requested power signal, Preq having a new value causing said range extender to deliver sufficient electric power to said electric drive system and to said battery system to maintain the state-of-charge of said battery system within a preselected state-of-charge range; activating said range extender to to deliver electric power having a value corresponding o the new value of said requested power signal Preg tending to maintain the difference between said consumed electric power and said delivered electric power to a value less than said predetermined difference; and repeating said step of detecting said state-of-charge through said step of activating said range extender until said state-of-charge is greater than a second predetermined value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A method for controlling he operation of a range extender for a hybrid electric vehicle having a battery system providing electric power to an dielectric drive, said range extender system comprising an internal combustion engine driving an alternator to deliver electric power in response to a requested power signal, Preq, supplementing the electric power provided by the battery system to increase the range of the hybrid electric vehicle, and said electric drive system including a motor having a first state in which said motor functions as an electric motor and switchable to a second state in response to a signal causing said motor to function as an electric generator, said method comprising the steps of:
-
detecting a value corresponding to a percentage of a full charge of said battery system to generate a state-of-charge signal; measuring the electric power being consumed by said electric drive system to generate a consumed power signal, Pcon, having a value corresponding to the value o the electric power being consumed by the electric drive system in response to the value of said state-of-charge signal being less than a first SOC value; measuring the electric power being delivered by said range extender to generate a delivered power signal Pdel having a value corresponding o the value of said delivered electric power in response to the value of said state-of-charge signal being less than said first SOC value; generating a requested power signal Preq in response to said value of said consumed power signal Pcon being greater than said value of said delivered power signal Pdel by a predetermined difference value, said requested power signal Preq having a new value causing said range extender to deliver sufficient electric power to said electric drive system and to said battery system to maintain the state-of-charge of said battery system within a predetermined state-of-charge range between said first SOC value and a second SOC value; activating said range extender in response to said requested power signal Preq to deliver said sufficient electrical power; controlling said electric power delivered by said range extender in response to said motor being switched to said second state so that the sum of the electric power being generated by said motor in said second state and said electric power being delivered by said range extender does not exceed a maximum charge rate of said battery system; reducing said electric power being delivered by said range extender in response to said requested power signal Preq to reduce the temperature of a coolant in said internal combustion engine in response to the temperature of said coolant exceeding a predetermined temperature; repeating said step of detecting the state-of-charge of said battery system through said step of reducing said electric power to reduce said temperature of said coolant until said state-of-charge is greater than said first SOC value. - View Dependent Claims (12, 13, 14)
-
-
15. A range extender for a hybrid electric vehicle having a battery system providing electric power to an electric drive system, said electric drive system having a motor having a first state in which it operates as an electric motor and a second state in which it operates as an electric generator to provide electric power to charge said battery system, said range extender comprising:
-
an alternator for generating electric power; an internal combustion engine producing a rotary output driving said alternator at a speed controlled by the value of a requested power signal, Preq ; a first sensor generating a state-of-charge signal having a value corresponding o the state-of-charge of said battery system; a second sensor generating a consumed power signal Pcon corresponding to the electrical power being consumed by said electric drive system; a third sensor generating a delivered power signal Pdel corresponding to the electrical power being delivered by said alternator; means or generating said requested power signal Preq in response to said value of said state-of-charge signal being less than a first state-of-charge value and said value of said consumed power signal Pcon being greater than said value of said delivered power signal Pdel by a predetermined quantity, said requested power signal Preq having a value causing said range extender to deliver sufficient electric power to said electric drive system and to said battery system to maintain said state-of-charge of said battery system within a predetermined range; means for controlling the value of said delivered power signal Pdel by said range extender in response to said motor being in said second state to prevent the sum of the electric power generated by said motor in said second state and said delivered power generated by said range extender from exceeding a maximum charge rate for said battery system; and means for reducing the value of said requested power signal Preq to reduce the load on said engine of said range extender and thereby reducing the temperature of said internal combustion engine in response to the temperature of a coolant of said engine exceeding a predetermined temperature.
-
Specification