公开(公告)号：WO1993007378A1

公开(公告)日：1993-04-15

申请号：PCT/US1991009679

申请日：1991-12-23

Applicant: CATERPILLAR INC.

Inventor： CATERPILLAR INC. ,  AUSMAN, Thomas, G. ,  LONGMAN, Douglas, E. ,  STOCKNER, Alan, R.

IPC: F02M57/02

CPC classification number: F02D41/062 ,  F02B2075/1832 ,  F02B2275/14 ,  F02D41/3809 ,  F02D2200/0606 ,  F02F7/006 ,  F02M57/025 ,  F02M63/00 ,  Y02T10/123

Abstract: In a hydraulically-actuated electronically-controlled unit injector, the viscosity of the actuating fluid used to actuate the unit injector varies with ambient temperature and affects the magnitude of pressure drops in the actuating fluid circuit. Such variations in viscosity affect the magnitude of the fuel delivery command pulsewidth and/or actuating fluid pressure required for engine startup versus that required for normal engine operation. The present invention provides an improved hydraulically-actuated electronically-controlled unit injector (18) and methods of operation which compensate for variations in the viscosity of the actuating fluid used to hydraulically actuate a piston (88). The stroke of the piston (88) is controlled electronically and/or mechanically in order to achieve an appropriate amount of fuel injection.

公开(公告)号：WO1993007384A1

公开(公告)日：1993-04-15

申请号：PCT/US1991009824

申请日：1991-12-23

Applicant: CATERPILLAR INC.

Inventor： CATERPILLAR INC. ,  AUSMAN, Thomas, G. ,  ERTEL, John, G. ,  FLINN, Michael, A.

IPC: F02M57/02

CPC classification number: F02M59/48 ,  F02B2075/1832 ,  F02B2275/14 ,  F02F7/006 ,  F02M57/025 ,  F02M59/105 ,  F02M59/466 ,  F02M2200/304 ,  Y02T10/123

Abstract: Herein are disclosed methods of conditioning fluid, such as damping fluid, in an electronically-controlled unit injector (18) in order to facilitate quick starting of an engine (12). Fluid normally used to dampen the motion of an electrical actuator assembly (36) of the unit injector (18) can remain in the actuator assembly (36) after the engine (12) is stopped. If too much fluid remains and cools off in the actuator assembly (36), quick starting of a cold engine may be hindered. Each of the above methods expels and/or heats up at least a portion of the remaining fluid in the actuator assembly (36) while the engine (12) is at rest and thereby enables quicker response of the actuator assembly (36) when the engine (12) is started. Such quicker response improves the fuel injection delivery capability and timing accuracy of the unit injector (18) during engine startup.

公开(公告)号：WO1993007382A1

公开(公告)日：1993-04-15

申请号：PCT/US1991009683

申请日：1991-12-23

Applicant: CATERPILLAR INC.

Inventor： CATERPILLAR INC. ,  AUSMAN, Thomas, G. ,  HARMON, Michael, P. ,  SHINOGLE, Ronald, D. ,  ZIMMER, Michael, T.

IPC: F02M57/02

CPC classification number: F02M59/105 ,  F02B2075/1832 ,  F02B2275/14 ,  F02F7/006 ,  F02M57/025 ,  F02M59/466 ,  F02M2200/304 ,  Y02T10/123

Abstract: An actuator and valve assembly (28) for an electronically-controlled unit injector (18) is disclosed which comprises an electrically-energizable actuator assembly (36) and a device (56) for communicating, collecting and draining damping fluid with respect to at least one cavity (57, 89) of the actuator assembly (36). If too much damping fluid remains in the actuator assembly (36) after engine shutdown, that damping fluid may cool off and cause slow response of the actuator and valve assembly (28) during cold engine starting. The end result is that quick starting and/or operation of the engine (12) may be hindered, particularly under cold engine conditions. The communicating, collecting and draining means (56) permits at least a portion of the hot damping fluid to automatically drain from the cavity (57, 89) after the engine (12) has been shutdown.

Abstract translation: 公开了一种用于电子控制单元喷射器（18）的致动器和阀门组件（28），其包括可电激励的致动器组件（36）和用于相对于至少相对于阻尼流体传递，收集和排放阻尼流体的装置（56） 致动器组件（36）的一个空腔（57,89）。 如果在发动机关闭之后，致动器组件（36）中剩余的阻尼流体太多，则在发动机冷起动期间，该阻尼流体可能冷却并引起致动器和阀组件（28）的响应较慢。 最终结果是发动机（12）的快速起动和/或操作可能受到阻碍，特别是在发动机冷却条件下。 在发动机（12）已经关闭之后，连通，收集和排放装置（56）允许热阻尼流体的至少一部分从空腔（57,89）自动排出。

公开(公告)号：WO1990002872A1

公开(公告)日：1990-03-22

申请号：PCT/US1988004603

申请日：1988-12-23

Applicant: CATERPILLAR INC.

Inventor： CATERPILLAR INC. ,  SHINOGLE, Ronald, D. ,  AUSMAN, Thomas, G.

IPC: F02D41/20

CPC classification number: F02D41/20 ,  F02D2041/2003 ,  F02D2041/2013 ,  F02D2041/2017 ,  F02D2041/2027

Abstract: A solenoid control circuit (160) provides energy to selected solenoids (168a-168c) to control actuation of a control valve of a fuel injector and, hence, the timing and duration of fuel delivered to each cylinder of an internal combustion engine. The current provided to each solenoid is also controlled to provide a three tier current wave form (B) having a pull-in current level (B1), a hold-in current level (B3), and an intermediate current level (B2). Energizing the solenoid at the pull-in current level (B1) starts movement of the control valve. After the control valve starts to move, the current level is reduced to the intermediate level (B2), which is less than the pull-in current level (B1), but great enough to continue movement of the control valve. Further reduction of the current level to the hold-in level (B3), which is less than either of the other current levels but sufficient to hold the control valve at the moved position. The solenoid is then de-energized and the control valve returned to its initial position to stop the flow of fuel to the engine. The foregoing is repeated for each of the other control valves of the fuel injectors to save energy and reduce the heat to be dissipated.