Method and system for identifying a type of gas
AssigneeHitachi, Ltd.
InventorsGeorge Saikalis, Shigeru Oho, Takashi Kadohiro
Life of this patent
Estimating the term…
Abstract
A method and a system are disclosed for identifying a gas type. The system includes a first sensor in contact with the gas and which produces a first electrical output signal indicative of a first condition of the gas. Similarly, a second sensor is also in contact with the gas and produces a second electrical output signal indicative of a second condition of the gas. A processor receives the output signals as input signals from the first and second sensors and determines the type of gas by calculation or from lookup tables stored in memory accessible to the processor. The first and second conditions of the gas are selected from the group of temperature, mass flow rate, temperature and pressure.
Claims20
A system for identifying a type of gas comprising:
- a first sensor in contact with the gas, said first sensor providing a first electrical output signal indicative of a first condition of the gas,
- a second sensor in contact with the gas, said second sensor providing a second electrical output signal indicative of a second condition of the gas,
- processing means which receives said first and second output signals as input signals for determining the type of gas,
- wherein each of said first and second conditions of the gas are selected from the group of temperature, mass flow rate and pressure.
A method for determining the type of gas in a volume of gas comprising the steps of:
- measuring a first condition of the gas in the gas volume with a first sensor in contact with the gas, said first sensor providing a first electrical output signal representative of said first condition,
- measuring a second condition of the gas in the gas volume with a second sensor in contact with the gas, said second sensor providing a first electrical output signal representative of said second condition, and
- processing said outputs from said first and second sensors to determine the gas type by comparing said sensor outputs with predetermined values,
- wherein said first and second conditions of the gas are each selected from the group of temperature, mass flow rate and pressure.
A system for identifying a type of gas in a gaseous fuel automotive internal combustion engine comprising:
- a first sensor in contact with the gas, said first sensor providing a first electrical output signal indicative of a first condition of the gas,
- a second sensor in contact with the gas, said second sensor providing a second electrical output signal indicative of a second condition of the gas,
- processing means which receives said first and second output signals as input signals for determining the type of gas,
- wherein each of said first and second conditions of the gas are selected from the group of temperature, mass flow rate and pressure.
A system for identifying a type of gas comprising:
- a first sensor in contact with the gas, said first sensor providing a first electrical output signal indicative of a first condition of the gas,
- a second sensor in contact with the gas, said second sensor providing a second electrical output signal indicative of a second condition of the gas,
- processing means which receives said first and second output signals as input signals for determining the type of gas,
- wherein each of said first and second conditions of the gas are selected from the group of temperature, mass flow rate, temperature and pressure.
Dependencies are inferred from the claim text.