Method of operating a transmission auxiliary pump
First Claim
1. A method of controlling an auxiliary pump by a processor for use with a power transmission in a vehicle including an electronic control unit and a throttle, the vehicle having a system power characteristic defined by at least one of a system voltage and a system current, the method comprising:
- determining an optimal auxiliary pump start characteristic defined by at least one of an optimal pump start voltage and an optimal pump start current;
determining if the system power characteristic is less than said optimal auxiliary pump start characteristic;
determining if the auxiliary pump is in a start-mode if the system power characteristic is less than said optimal auxiliary pump start characteristic;
determining if an actual auxiliary pump speed is less than a desired auxiliary pump speed if the auxiliary pump is in said start-mode; and
increasing at least one of an actual auxiliary pump voltage and current to equal said optimal auxiliary pump start characteristic if said actual auxiliary pump speed is less than said desired auxiliary pump speed.
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Accused Products
Abstract
A method of controlling an auxiliary pump for use with a transmission in a vehicle is provided, the vehicle having a system voltage/current. The method comprises: determining an optimal auxiliary pump start voltage/current; determining if the system voltage/current is less than the optimal auxiliary pump start voltage/current; if yes, determining if the auxiliary pump is in a start-mode and if a predetermined override condition has been met; determining if the actual auxiliary pump speed is less than a desired auxiliary pump speed if the auxiliary pump is in the start-mode; if not, determining if the auxiliary pump is in an on-state; and, increasing an actual auxiliary pump voltage/current to equal the optimal auxiliary pump start voltage/current if the actual auxiliary pump speed is less than the desired auxiliary pump speed or the predetermined override condition has been met.
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Citations
20 Claims
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1. A method of controlling an auxiliary pump by a processor for use with a power transmission in a vehicle including an electronic control unit and a throttle, the vehicle having a system power characteristic defined by at least one of a system voltage and a system current, the method comprising:
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determining an optimal auxiliary pump start characteristic defined by at least one of an optimal pump start voltage and an optimal pump start current; determining if the system power characteristic is less than said optimal auxiliary pump start characteristic; determining if the auxiliary pump is in a start-mode if the system power characteristic is less than said optimal auxiliary pump start characteristic; determining if an actual auxiliary pump speed is less than a desired auxiliary pump speed if the auxiliary pump is in said start-mode; and increasing at least one of an actual auxiliary pump voltage and current to equal said optimal auxiliary pump start characteristic if said actual auxiliary pump speed is less than said desired auxiliary pump speed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of controlling an auxiliary pump by a processor for use with a power transmission in a hybrid vehicle including an electronic control unit, the hybrid vehicle having a system power characteristic defined by at least one of a system voltage and a system current, the method comprising:
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determining an optimal auxiliary pump start characteristic defined by at least one of an optimal pump start voltage and an optimal pump start current; determining if the system power characteristic is less than said optimal auxiliary pump start characteristic; determining if the auxiliary pump is in a start-mode and if a predetermined override condition has been met if the system power characteristic is less than said optimal auxiliary pump start characteristic; determining if an actual auxiliary pump speed is less than a desired auxiliary pump speed if the auxiliary pump is in said start-mode; and increasing at least one of an actual auxiliary pump voltage and current to equal said optimal auxiliary pump start characteristic if said actual auxiliary pump speed is less than said desired auxiliary pump speed or if said predetermined override condition has been met; wherein said increasing said respective at least one actual auxiliary pump voltage and current includes commanding the electronic control unit to increase at least one of the system voltage and current to equal said optimal auxiliary pump start characteristic. - View Dependent Claims (16, 17, 18, 19)
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20. A method of controlling an auxiliary pump by a processor for use with a power transmission in a hybrid vehicle including an electronic control unit, the hybrid vehicle having a system power characteristic defined by at least one of a system voltage and a system current, the method comprising:
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determining an optimal auxiliary pump start characteristic defined by at least one of an optimal pump start voltage and an optimal pump start current; determining if the system power characteristic is less than said optimal auxiliary pump start characteristic; determining if the auxiliary pump is in a start-mode and if a predetermined override condition has been met if the system power characteristic is less than said optimal auxiliary pump start characteristic; determining if an actual auxiliary pump speed is less than a desired auxiliary pump speed if the auxiliary pump is in said start-mode; increasing at least one of an actual auxiliary pump voltage and current to equal said optimal auxiliary pump start characteristic if said actual auxiliary pump speed is less than said desired auxiliary pump speed or if said predetermined override condition has been met; determining if the auxiliary pump is in an on-state if the auxiliary pump is not in said start-mode; determining a hierarchy of optimization parameters if the auxiliary pump is in said on-state; determining an optimal auxiliary pump transition characteristic based at least in part upon said hierarchy of optimization parameters, said optimal auxiliary pump transition characteristic defined by at least one of an optimal steady-transient state voltage and an optimal steady-transient state current; determining if the system power characteristic is not equal to said optimal auxiliary pump transition characteristic; determining if the auxiliary pump is in a steady state if the system power characteristic is not equal to said optimal auxiliary pump transition characteristic; increasing at least one of said actual auxiliary pump voltage and current to equal said optimal auxiliary pump transition characteristic if the auxiliary pump is in said steady state; determining if the auxiliary pump is in a transient state if the auxiliary pump is not in said steady state; determining an optimal auxiliary pump transition characteristic ramp rate based at least in part upon a predetermined magnitude of said transient state; and increasing at least one of said actual auxiliary pump voltage and current to equal said optimal auxiliary pump transition characteristic according to said optimal auxiliary pump transition characteristic ramp rate if the auxiliary pump is in said transient state.
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Specification