Method and fluid pump for conveying a fluid in a fluid circuit of a motor vehicle
AssigneeBrose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Wuerzburg
InventorsAdarsha Kanchana, Christian Bienick
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Abstract
A method for conveying a fluid of a fluid circuit by means of an electric motor-powered fluid pump of a motor vehicle, in particular an oil pump, wherein by means of the fluid pump a fluid pressure of the fluid circuit is adjusted to a target pressure, and wherein an actual pressure of the fluid is determined without a pressure sensor.
Claims17
A method of conveying a fluid of a fluid circuit including an electric motor-driven fluid pump in a motor vehicle, the method comprising:
- regulating a fluid pressure in the fluid circuit to a set point pressure via the fluid pump;
- determining an actual pressure of the fluid, without a pressure sensor, based on a load torque of the fluid pump and a viscosity of the fluid;
- and
- determining the load torque based on a difference of an actual torque of the electric motor of the fluid pump and a dynamic torque based on dynamic characteristics of the fluid.
An electric motor-driven fluid pump for a motor vehicle comprising:
- a pump configured to convey a fluid through a fluid circuit;
- pump electronics;
- and
- a pump controller configured to:
- determine a temperature of the fluid by a thermal transfer model by way of an operating temperature of the pump electronics;
- determine a viscosity of the fluid based on the temperature of the fluid;
- and
- determine an actual pressure of the fluid, without use of a pressure sensor, based on a load torque of the pump and the viscosity of the fluid;
- and
- regulate pressure of the fluid with the pump to a set point pressure based on the actual pressure.
A method of regulating pressure of a fluid pump including an electric motor and disposed in a fluid circuit disposed in a motor vehicle, the method comprising:
- receiving first signals indicative of a torque of the electric motor;
- receiving second signals indicative of a dynamic torque of the fluid pump;
- and
- altering the pressure of the fluid pump based on the first and second signals.
Dependencies are inferred from the claim text.