All wheel drive hydraulic fluid pressure sensor compensation algorithm
AssigneeHonda Motor Co., Ltd.
InventorSteven P. Turner
Life of this patent
Estimating the term…
Abstract
A method may be provided for correcting a raw signal supplied by a pressure sensor in an all wheel drive system having a hydraulic pump and a hydraulic fluid. The method may include measuring the raw signal supplied by the pressure sensor, determining when the all wheel drive system is in a state where the hydraulic fluid is at a known pressure determined independently from the pressure sensor, determining a new zero-point offset by comparing the raw signal to a voltage value associated with the known pressure, and creating a corrected voltage signal by adjusting the raw signal based on the new zero-point offset. This corrected voltage signal may be converted into a pressure reading for controlling the all wheel drive system.
Claims20
A system of controlling an all wheel drive system in a vehicle, comprising:
- an atmospheric pressure sensor coupled to the vehicle;
- a pressure sensor configured to detect a hydraulic pressure of the all wheel drive system;
- and
- a controller in communication with the atmospheric pressure sensor and the pressure sensor to control the all wheel drive system of the vehicle configured to:
- determine whether the vehicle is in an idle stop state,
- when the vehicle is in an idle stop state, determine whether at least one predetermined testing condition is met, and
- when the vehicle is in an idle stop state and the at least one predetermined testing condition is met:
- determine an atmospheric pressure from a measured atmospheric pressure by the atmospheric pressure sensor,
- measure a raw output from the pressure sensor,
- determine a zero-point offset by comparing the atmospheric pressure, the raw output, and a known pressure value present when the at least one predetermined testing condition is met,
- create a corrected pressure reading using the zero-point offset and a second raw output from the pressure sensor, and
- use the corrected pressure reading to control activation of the all wheel drive system of the vehicle.
A system of controlling an all wheel drive system in a vehicle, comprising:
- an atmospheric pressure sensor coupled to the vehicle;
- a pressure sensor configured to detect a hydraulic pressure of the all wheel drive system;
- and
- a controller in communication with the atmospheric pressure sensor and the pressure sensor to control the all wheel drive system of the vehicle configured to:
- determine whether the vehicle is in an idle stop state,
- when the vehicle is in an idle stop state:
- determine an atmospheric pressure from a measured atmospheric pressure by the atmospheric pressure sensor,
- measure a raw output from the pressure sensor,
- determine a zero-point offset by comparing the atmospheric pressure, the raw output, and a known pressure value present when the at least one predetermined testing condition is met,
- create a corrected pressure reading using the zero-point offset and a second raw output from the pressure sensor, and
- use the corrected pressure reading to control activation of the all wheel drive system of the vehicle.
A method of controlling an all wheel drive system in a vehicle executed by a controller having a processor and a memory, the method comprising:
- determining whether the vehicle is in an idle stop state,
- when the vehicle is in an idle stop state, determining whether at least one predetermined testing condition is met, and
- when the vehicle is in an idle stop state and the at least one predetermined testing condition is met:
- determining an atmospheric pressure from a measured atmospheric pressure by an atmospheric pressure sensor coupled to the vehicle,
- determining a raw output from a pressure sensor configured to detect a hydraulic pressure of the all wheel drive system,
- determining a zero-point offset by comparing the atmospheric pressure, the raw output, and a known pressure value present when the at least one predetermined testing condition is met,
- determining a corrected pressure reading using the zero-point offset and a second raw output from the pressure sensor, and
- using the corrected pressure reading to control activation of the all wheel drive system of the vehicle.
Dependencies are inferred from the claim text.