[특허]Vehicle-mounted electric generator control system which selectively supplies regenerative field current to battery in accordance with currently available generating capacity

Denso Corporation

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특허 상세정보

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내보내기 페이스북 공유 트위터 공유 카카오톡 공유

Vehicle-mounted electric generator control system which selectively supplies regenerative field current to battery in accordance with currently available generating capacity

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H02P-009/00
미국특허분류(USC)	290/040.R; 290/041; 290/040.A; 290/040.C; 290/040.D; 322/028
출원번호	US-0194626 (2005-08-02)
우선권정보	JP-2004-225033(2004-08-02)
발명자 / 주소	Asada,Tadatoshi
출원인 / 주소	Denso Corporation
대리인 / 주소	Oliff &
인용정보	피인용 횟수 : 33 인용 특허 : 5

초록
▼

A control apparatus for a vehicle electric generator judges the currently available generating capacity of the generator and establishes a regenerative current mode of operation, utilizing an induced current of the field winding, only when the generating capacity is estimated to be below a predetermined level. The control apparatus also controls the conduction factor of a power transistor to adjust the average voltage applied to the field winding such as to prevent fluctuations in output current and generator torque that would otherwise occur at each cha...

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What is claimed is: 1. An electric generator control apparatus for controlling an electric generator of a vehicle, the electric generator having a voltage supply terminal connected to a battery and an electrical load, the apparatus including a bridge circuit coupled between said voltage supply terminal and a field winding of said electric generator, with said bridge circuit having a first pair of opposing arms comprising respective diodes and a second pair of opposing arms comprising respective power transistors, said generator control apparatus further including operating mode selector means for selectively establishing (a) a back current mode of operation wherein a first one of said power transistors is held continuously in an on state and a second one of said power transistors is repetitively switched between said on state, for applying a drive voltage to said field winding, and an off state, for disconnecting said drive voltage from said field winding, whereby an induced current which flows from said field winding during said off state is returned directly to said field winding, and (b) a regenerative current mode of operation wherein synchronized on and off switching of said first and second power transistors is performed, whereby said induced current is passed as a regenerative current into said battery; wherein said electric generator control apparatus comprises generation capacity judgement means for judging a currently available electrical generating capacity of said electric generator, and said operating mode selector means is responsive to said generation capacity judgement means for selecting said regenerative current mode when said electrical generating capacity is judged to be below a predetermined level. 2. A generator control apparatus according to claim 1, wherein said electrical generating capacity judgement means comprises rotation detection means for detecting a speed of rotation of a rotor of said electric generator, and wherein said electrical generating capacity is judged based upon said detected speed of rotation. 3. A generator control apparatus according to claim 2, wherein said electrical generating capacity judgement means judges that said electrical generating capacity is insufficient when said detected speed of rotation is below a fixedly predetermined reference value. 4. A generator control apparatus according to claim 1, wherein said electrical generating capacity judgement means comprises sensor means for detecting a level of output current of said electric generator, and wherein said electrical generating capacity is judged based on said detected level of output current. 5. A generator control apparatus according to claim 1, wherein each of said power transistors is a double-diffusion type of MOS (Metal-Oxide Semiconductor) field effect transistor having a body diode, and wherein each of said diodes of said generator control apparatus comprises a body diode of a transistor having an identical cross-sectional configuration to each of said power transistors. 6. A generator control apparatus according to claim 1, comprising conduction factor modification means for modifying a conduction factor of said second power transistor at each occurrence of changeover from said back current mode to said regenerative current mode and each occurrence of changeover from said regenerative current mode to said back current mode. 7. A generator control apparatus according to claim 6, wherein said conduction factor modification means performs said modification of said conduction factor to reduce an extent of variation of an average value of said drive voltage of said field winding. 8. A generator control apparatus according to claim 6, wherein said conduction factor modification means increases said conduction factor at each occurrence of changeover from said back current mode to said regenerative current mode and decreases said conduction factor at each occurrence of changeover from said regenerative current mode to said back current mode. 9. A generator control apparatus according to claim 8, wherein designating D1 as a value of said conduction factor immediately prior to a changeover from said back current mode to said regenerative current mode, and designating D2 as an updated value established for said conduction factor at to said changeover from said back current mode to said regenerative current mode, said conduction factor modification means performs said conduction factor modification at said changeover by utilizing a relationship: description="In-line Formulae" end="lead"D 2=(D1+1)/2description="In-line Formulae" end="tail" and wherein designating D3 as a value of said conduction factor immediately prior to a changeover from said regenerative current mode to said back current mode, and designating D 4 as an updated value established for said conduction factor at said changeover from said regenerative current mode to said back current mode, said conduction factor modification means performs said conduction factor modification at said changeover by utilizing a relationship: description="In-line Formulae" end="lead"D 4=2횞D3-1.description="In-line Formulae" end="tail" 10. A generator control apparatus according to claim 9, wherein said conduction factor modification means expresses a value of said conduction factor as n bits of data, where n is a fixed integer, and wherein said conduction factor modification means performs a bit shift operation on said n bits at each said changeover between said back current mode and regenerative current mode, and establishes an updated value for said conduction factor immediately subsequent to said changeover based upon a result of said bit shift operation. 11. A control apparatus for a vehicle-mounted electric generator, the electric generator including a field winding and the control apparatus including means for applying a drive voltage to said field winding and perform successive on/off switching of said drive voltage with a duty ratio that determines a level of output current produced from said electric generator, wherein said control apparatus comprises: means for judging a currently available electric generating capacity of said electric generator; means for selectively establishing a regenerative current mode of operation in which an induced current of said field winding of said electric generator augments said output current and a back current mode of operation in which said induced current does not augment said output current, in accordance with whether said electrical generating capacity is judged to be above a predetermined level; and means for performing adjustment of an average value of said drive voltage, said adjustment being performed at each occurrence of a changeover between said regenerative current mode and said back current mode, with an amount and direction of said adjustment being respectively predetermined to suppress occurrence of a significant change in amplitude of said output current at said changeover.

이 특허에 인용된 특허 (5)

이 특허를 인용한 특허 피인용횟수: 33

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Vehicle-mounted electric generator control system which selectively supplies regenerative field current to battery in accordance with currently available generating capacity

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Vehicle-mounted electric generator control system which selectively supplies regenerative field current to battery in accordance with currently available generating capacity

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이 특허에 인용된 특허 (5)

이 특허를 인용한 특허 피인용횟수: 33

IPC 상위 출원인

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IPC 상세정보(version : 201201)

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