초록 ▼

A fuel conditioning and measuring system for testing diesel engines includes a fuel conditioning loop having first and second heat exchangers, one employing a heating medium, and one employing a cooling medium. Flow of the heating and cooling mediums to the heat exchangers is controlled by control v

A fuel conditioning and measuring system for testing diesel engines includes a fuel conditioning loop having first and second heat exchangers, one employing a heating medium, and one employing a cooling medium. Flow of the heating and cooling mediums to the heat exchangers is controlled by control valves which receive a signal indicative of the temperature of the fuel flowing through the system and compare the measured temperature to a desired temperature to generate a control signal for positioning the control valves appropriately. A mixing tank serves as a buffer between the fuel supply and the test engine to ensure any disturbances from fuel returning from the test engine do not adversely affect the testing of the engine, and provides a mechanism by which the temperature of the fuel can be more accurately controlled. A flow meter and a density meter measure the flow of fuel through the system to provide accurate indications of mass and volumetric flow.

대표청구항 ▼

A fuel conditioning and measuring system for testing diesel engines includes a fuel conditioning loop having first and second heat exchangers, one employing a heating medium, and one employing a cooling medium. Flow of the heating and cooling mediums to the heat exchangers is controlled by control v

A fuel conditioning and measuring system for testing diesel engines includes a fuel conditioning loop having first and second heat exchangers, one employing a heating medium, and one employing a cooling medium. Flow of the heating and cooling mediums to the heat exchangers is controlled by control valves which receive a signal indicative of the temperature of the fuel flowing through the system and compare the measured temperature to a desired temperature to generate a control signal for positioning the control valves appropriately. A mixing tank serves as a buffer between the fuel supply and the test engine to ensure any disturbances from fuel returning from the test engine do not adversely affect the testing of the engine, and provides a mechanism by which the temperature of the fuel can be more accurately controlled. A flow meter and a density meter measure the flow of fuel through the system to provide accurate indications of mass and volumetric flow. des by adjusting a predetermined attenuator in said network of attenuators. 8. The micro-gyroscope as claimed in claim 7 wherein said step of aligning said electronic output of said drive electrodes further comprises the steps of: exciting a first drive electrode with a sinusoidal voltage at frequency Zy, adjusting said predetermined attenuator until a first harmonic component of a sense signal is at a minimum; exciting a second drive electrode with a sinusoidal voltage at a frequency Zx; and adjusting said predetermined attenuator until a first harmonic component of a second sense signal is at a minimum. 9. The method as claimed in claim 8 wherein said steps of exciting a first and second drive electrode and adjusting an attenuator are repeated for refined alignment. 10. The method as claimed in claim 8 wherein said step of aligning said sense electrodes further comprises the steps of: exciting a first drive electrode with a sinusoidal voltage at frequency Zx; adjusting said predetermined attenuator until a first harmonic component of a sense signal is at a minimum; exciting a second drive electrode with a sinusoidal voltage at a frequency Zy; and adjusting said predetermined attenuator until a first harmonic component of a second sense signal is at a minimum. 11. The method as claimed in claim 10 wherein said steps of exciting a first and second drive electrode and adjusting said predetermined attenuator are repeated for refined alignment. 12. The method as claimed in claim 7 further comprising the step of electronically canceling a second harmonic component on said first sense electrode. 13. The method as claimed in claim 12 wherein said step of electronically canceling a second harmonic component further comprises the steps of: squaring the drive signal; and subtracting a fraction of said squared signal from said sensed signal.