发明名称 |
Fuel pump control apparatus of engine |
摘要 |
By driving a fuel pump suitably to an amount of fuel according to an amount of fuel consumed by an engine and by monitoring an actual motor speed of the fuel pump, F/B control is carried out according to a target motor speed and the actual motor speed of the fuel pump. Meanwhile, by learning and storing a duty value comparable to a deviation between the target and actual motor speeds, duty driving of the fuel pump is corrected to suit an engine condition. It thus becomes possible to provide a fuel pump control apparatus of an engine capable of promoting power saving by suppressing a wasteful energy loss including a current consumption and making an internal circuit of an ECU simpler by enhancing fuel supply accuracy. |
申请公布号 |
US9284907(B2) |
申请公布日期 |
2016.03.15 |
申请号 |
US201113273764 |
申请日期 |
2011.10.14 |
申请人 |
Mitsubishi Electric Corporation |
发明人 |
Yamaguchi Yohei;Ishida Yasuhiko |
分类号 |
F02D41/30;F02D41/24;F02D41/20 |
主分类号 |
F02D41/30 |
代理机构 |
Sughrue Mion, PLLC |
代理人 |
Sughrue Mion, PLLC ;Turner Richard C. |
主权项 |
1. A fuel pump control apparatus of an engine, comprising:
an operation condition detection portion that detects an operation condition of the engine; a motorized fuel pump furnished with a fuel pressure regulation function; an injector that supplies the engine with fuel according to a fuel pressure supplied from the motorized fuel pump; a power generation portion that generates power by manual rotational driving of a crank shaft of the engine; and a control portion that is activated by a voltage generated by the power generation portion and computes an amount of fuel to be injected and calculates a fuel pump driving duty according to a detected value from the operation condition detection portion, wherein the control portion includes: an injector injection amount calculation functioning portion that calculates an amount of injector injection to be supplied to the engine according to the operation condition of the engine; a fuel consumption amount calculation functioning portion that calculates an amount of fuel the engine is consuming on a basis of the amount of injector injection, a number of cylinders of the engine, and an engine rotation speed of the engine; a pump driving fuel amount calculation functioning portion that calculates an amount of fuel to drive the motorized fuel pump on a basis of an output of the fuel consumption amount calculation functioning portion; a target motor speed calculation functioning portion that calculates a target motor speed on a basis of an output of the pump driving fuel amount calculation functioning portion; a driving duty calculation functioning portion that calculates the fuel pump driving duty indicating time periods during which the motorized fuel pump is driven, on a basis of an output of the target motor speed calculation functioning portion; and a feedback (F/B) correction value calculation functioning portion that finds a deviation between an actual motor speed detected from the motorized fuel pump and the target motor speed and calculates a F/B correction value of the fuel pump driving duty so that the deviation is eliminated, wherein: in a case where a state in which the operation condition of the engine is stable for a predetermined time period or longer and the F/B correction value is stable without yielding the deviation between the actual motor speed and the target motor speed for the predetermined time period or longer, the control portion learns the F/B correction value and stores the F/B correction value in a memory region in the control portion, so that when the control portion is activated a next time after the predetermined time period elapses, the control portion starts control by correcting the fuel pump driving duty with the stored, learned F/B correction value in addition to a subsequent F/B correction value calculated when the control portion is activated the next time. |
地址 |
Tokyo JP |