Emissions control system
AssigneeGenerac Power Systems, Inc.
InventorsNoah Frank Anonich, Stephen Paul Schroeder, Antonio Charles Carini, Daniel Karl Schlepp, Enrique Torres Guzman
Life of this patent
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Abstract
A method of pumping DEF (diesel exhaust fluid) in a diesel emissions control system. The method includes pumping DEF from an auxiliary DEF tank to an onboard DEF tank. The DEF is pumped from the auxiliary DEF tank to the onboard DEF tank. The fluid pathway is purged with air after pumping the DEF from the auxiliary DEF tank to the onboard DEF tank. The air is pumped (1) through the fluid pathway from the auxiliary DEF tank, or (2) into the auxiliary DEF tank.
Claims20
A method of pumping DEF fluid from an auxiliary DEF tank into an onboard DEF tank through a DEF line, the method comprising:
- determining that the amount of DEF in the onboard DEF tank is at or below a lower threshold value;
- activating a pump to pump DEF from the auxiliary DEF tank through a DEF line into the onboard DEF tank;
- determining that the amount of DEF in the onboard DEF tank is at or above an upper threshold;
- and
- activating the pump to pump DEF from the DEF line into the auxiliary DEF tank.
A method of pumping DEF fluid from an auxiliary DEF tank into an onboard DEF tank, the method comprising:
- determining that the amount of DEF in the onboard DEF tank is at or below a lower threshold value;
- activating a pump to perform a first pumping sequence comprising pumping from the auxiliary DEF tank toward the onboard DEF tank for a predetermined time interval;
- and
- activating the pump to perform a second pumping sequence, the second pumping sequence comprising pumping air from the onboard DEF tank into the auxiliary DEF tank.
A method of pumping DEF fluid from an auxiliary DEF tank into an onboard DEF tank, the method comprising:
- determining that the amount of DEF in the onboard DEF tank is at or below a lower threshold value;
- activating a pump to perform a first pumping sequence comprising pumping from the auxiliary DEF tank toward the onboard DEF tank for a predetermined time interval;
- wherein the predetermined time interval is at least the amount of time required to fill the onboard DEF tank to an upper threshold value from the lower threshold value;
- and
- interrupting the first pumping sequence when the amount of DEF in the onboard DEF tank is determined to reach the upper threshold value.
A method of pumping DEF fluid from an auxiliary DEF tank into an onboard DEF tank, the method comprising:
- determining that the amount of DEF in the onboard DEF tank is at or below a lower threshold value;
- activating a pump to perform a first pumping sequence comprising pumping from the auxiliary DEF tank toward the onboard DEF tank for a predetermined time interval;
- wherein the predetermined time interval is at least the amount of time required to fill the onboard DEF tank to an upper threshold value from the lower threshold value;
- and
- activating the pump to perform a second pumping sequence comprising pumping air through at least a portion of a fluid pathway between the auxiliary DEF tank and the pump.
A method of pumping DEF fluid from an auxiliary DEF tank into an onboard DEF tank, the method comprising:
- determining that the amount of DEF in the onboard DEF tank is at or below a lower threshold value;
- activating a pump to perform a first pumping sequence comprising pumping from the auxiliary DEF tank toward the onboard DEF tank;
- determining that the auxiliary DEF tank is empty, wherein determining that the auxiliary DEF tank is empty comprises:
- measuring a fluid level in the onboard DEF tank over a predetermined amount of time, wherein the predetermined amount of time is at least the amount of time required to purge DEF from a fluid pathway between the pump and the auxiliary DEF tank;
- and
- stopping the pump.
Dependencies are inferred from the claim text.