All wheel drive hydraulic fluid pressure sensor compensation algorithm
First Claim
1. 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, andwhen 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, anduse the corrected pressure reading to control activation of the all wheel drive system of the vehicle.
1 Assignment
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Accused Products
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.
10 Citations
20 Claims
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1. A system of controlling an all wheel drive system in a vehicle, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system of controlling an all wheel drive system in a vehicle, comprising:
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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. - View Dependent Claims (10, 11, 12)
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13. 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:
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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. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification