1. A system for pumping a cryogenic fluid from a storage tank, said system comprising:
a reciprocating pump comprising a suction inlet and a discharge outlet; a first pipe fluidly connecting said suction inlet to liquid within the interior of said storage tank;
a second pipe fluidly connecting said suction inlet to vapor within said storage tank; and
a restriction in said second pipe for limiting flow through said second pipe so that a mixture of liquid and vapor may be supplied from said storage tank to said suction inlet.
2. The system of claim 1 wherein said pump comprises a cold end disposed within a sump and a warm end opposite to said cold end and said suction inlet is associated with said cold end and said discharge outlet is associated with said warm end.
3. The system of claim 1 further comprising a linear hydraulic drive connected to a piston of said pump.
4. The system of claim 3 wherein said piston is drivable at a constant speed by said linear hydraulic drive.
5. The system of claim 3 wherein said pump is operable by said linear hydraulic drive at speeds between 5 and 30 cycles per minute.
6. The system of claim 1 wherein said restriction is made by an orifice.
7. The system of claim 1 wherein said restriction is effected by a metering valve.
8. The system of claim 1 wherein said restriction is sized to maintain a vapor fraction supplied to said pump that is equal to or less than a predetermined maximum vapor fraction.
9. The system of claim 1 wherein said reciprocating pump comprises an inducer disposed between said suction inlet a compression chamber.
10. The system of claim 9 further comprising a check valve disposed within said suction inlet to prevent fluid from flowing from said inducer back into said first and second pipes.
11. The system of claim 10 wherein said inducer comprises:
an induction chamber with a volume that is at least four times the volume of said compression chamber;
a piston is reciprocable within said induction chamber, dividing said induction chamber into two subchambers;
a first check valve allowing fluid to flow from a first one of said two subchambers to a second one of said two subchambers; and
a second check valve allowing fluid to flow from said second one of said two subchambers to said first one of said two subchambers.
12. The system of claim 1 wherein said reciprocating pump comprises:
a first compression chamber in fluid communication with said suction inlet;
a second compression chamber in fluid communication with said first compression chamber and said discharge outlet, wherein the volumetric ratio between said first chamber and said second chamber is more than 2:1;
a reciprocable piston disposed within said reciprocating pump and fluidly separating said first and second compression chambers;
a check valve disposed in said suction inlet through which fluid can flow from said first and second pipes into said first compression chamber;
a check valve disposed in a passage between said first and second chamber through which fluid can flow from said first compression chamber to said second compression chamber; and
a check valve associated with said discharge outlet through which fluid can flow from said second compression chamber.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method for controlling an engine of a vehicle, comprising:
adjusting a first port throttle, regulating air flow solely to a first engine cylinder, to a first position;
adjusting a second port throttle, regulating air flow solely to a second engine cylinder, to a second position, different than the first position; and
starting an engine after positioning the first and second port throttles, the engine driving wheels through a torque converter and transmission.
2. The method of claim 1, where the first and second port throttles are located downstream of an engine air inlet throttle, and where the first and second positions are based on a desired engine stopping position.
3. The method of claim 1, further comprising adjusting the first port throttle to a third position and adjusting the second port throttle to a fourth position, the fourth position different than the third position, in response to an engine stop request.
4. The method of claim 3, where the engine includes first and second cylinders downstream of the first and second port throttles, the first and second cylinders including intake poppet valves.
5. The method of claim 1, further comprising adjusting the first and second port throttles in response to ambient air temperature.
6. The method of claim 1, further comprising adjusting the first and second port throttles in response to engine temperature.
7. A method for adjusting engine port throttles, comprising:
positioning a first port throttle in a first position, the first port throttle regulating air flow solely to a first cylinder;
positioning a second port throttle in a second position, different than the first position, the second port throttle regulating air flow solely to a second cylinder;
starting an engine after positioning the first and second port throttles, the engine coupled to vehicle wheels through a torque converter and transmission; and
adjusting the second port throttle to a same position as the first port throttle, the port throttle positions selected based on a gear ratio of the transmission.
8. The method of claim 7, where the first port throttle and the second port throttle are located downstream of an air inlet throttle, and further comprising where the second port throttle is adjusted to the same position as the first port throttle in response to an engine operating condition.
9. The method of claim 8, where the engine operating condition is an engine speed or an intake manifold pressure.
10. The method of claim 7, further comprising adjusting a position of the first or second port throttle in response to a number of engine events.
11. The method of claim 10, where the number of engine events is a number of engine combustion events since engine stop.
12. The method of claim 7, where the first port throttle is further positioned during an engine start based on barometric pressure.
13. The method of claim 7, further comprising adjusting the first port throttle in synchronization with adjusting the second port throttle after the second port throttle is adjusted to the same position as the first port throttle.
14. The method of claim 7, where the first port throttle and the second port throttle are adjusted to different positions during automatic and operator initiated engine starts.
15. A system for controlling an engine, comprising:
a first engine cylinder port throttle located along an engine air intake passage regulating air flow solely to a first cylinder;
a second engine cylinder port throttle located along an engine air intake passage regulating air flow solely to a second cylinder; and
a controller including instructions for adjusting a position of the engine air intake throttle, the controller including further instructions for adjusting the first engine cylinder port throttle to a first position during an operator directed engine start, the controller also including instructions for adjusting the second engine cylinder port throttle to a second position during the operator directed engine start, the second position different from the first position, where one of the first and second positions is selected based on a transmission gear ratio of a transmission coupled to the engine.
16. The system of claim 15, further comprising an engine air intake throttle located along an engine air intake passage for regulating air flow to the first and second engine cylinder port throttles, and where the position of the engine air intake throttle is adjusted based on barometric pressure.
17. The system of claim 16, further comprising additional controller instructions for adjusting the first engine cylinder port throttle and the second engine cylinder port throttle to a same position after engine start.
18. The system of claim 17, further comprising additional controller instructions for adjusting the first engine cylinder port throttle and the second engine cylinder port throttle in response to engine speed and engine load after the first and second engine cylinder port throttles are adjusted to the same position.
19. The system of claim 15, where the controller includes further instructions for adjusting the first engine cylinder port throttle and the second engine cylinder port throttle to different positions in response to an automatic engine start.
20. The system of claim 19, where the controller includes further instructions for opening the first engine cylinder port throttle further during the operator directed start than during the automatic engine start.