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Electric power generating system for a vehicle

A technology for power generation systems and vehicles, applied in control systems, vehicle energy storage, vehicle components, etc., can solve the problems of unfavorable and difficult to adopt ferromagnetic cores

Active Publication Date: 2004-08-18
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to adopt in terms of durability and miniaturization
In addition, ferromagnetic cores are also disadvantageous in terms of price, manpower required for production, temperature characteristics, etc., so it is difficult to adopt

Method used

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  • Electric power generating system for a vehicle
  • Electric power generating system for a vehicle
  • Electric power generating system for a vehicle

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0032] first reference figure 1 , a power generation system for a vehicle is configured with a generator 1, a voltage control device 2, a battery 3, an electrical load 4, and an electronic control unit (ECU) 5 for an internal combustion engine (not shown).

[0033] The generator is driven to rotate by the engine, and generates electric power for charging the battery 3 and electric power for operating the electric load 4 .

[0034] The voltage control device 2 controls the generator 1 to adjust the output voltage of the generator 1 to a predetermined value by controlling the conduction state of the excitation current flowing in the generator 1 to the excitation coil. In this voltage control device 2, a power supply circuit that generates an operating voltage of an element circuit, a power device such as a power transistor for controlling conduction of an excitation current, a logic circuit for performing this conduction control, and the like are realized by a CMOS-IC . The v...

no. 2 example

[0087] Because the noise absorbing ability is lowered in the case of deterioration of the battery 3, the variation in the output voltage of the generator 1 becomes large. In this case, it is also desirable to prohibit the output of the power generation suppression signal.

[0088] Figure 15A and 15B show changes in battery terminal voltage due to the presence or absence of battery 3 degradation. When the battery 3 deteriorates, the internal resistance increases. The internal impedance of a new undegraded battery 3 is R1 ( Figure 15A ), the internal impedance of the degraded battery 3 is R2 (FIG. 15B).

[0089] Assuming that the negative surge current flowing when the inductive electrical load 14 is turned on or off is i, the ideal terminal voltage of the battery 3 is V batt , then the battery voltage V of the undegraded battery 3 b1 becomes V batt -i×R1, battery voltage V of degraded battery 3 b2 becomes V batt -i×R2. Comparing these voltages, since there is a relat...

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Abstract

A vehicle power generating system includes a power generator, a voltage controller, a battery, and an external controller. The voltage controller(2) is used for controlling an output voltage of the power generator(1). The battery(3) is charged by output electric power of the power generator. The external controller(5) is used for outputting a power generation suppression signal toward the voltage controller in order to suppress the power generation by the power generator. The external controller is used for detecting a state of the battery and inhibiting an output of the power generation suppress ion signal when quantity of the detected state is below a predetermined value.

Description

technical field [0001] The present invention relates to a power generation system for a vehicle which controls the power generation state of a generator to charge a battery. Background technique [0002] In recent years, due to the development of miniaturization technology in the semiconductor field, it has been possible to form high-power devices, such as power transistors, freewheeling diodes, etc., and CMOS logic circuits in a composite manner on one chip. It can also be greatly reduced in size compared with conventional hybrid circuit IC type voltage control devices. Conventional hybrid IC type voltage control devices are fabricated by arranging discrete devices on a substrate. [0003] Such a CMOS digital integrated circuit (IC) is suitable for speeding up operation and stabilizing a controlled state, and is also very small in size. Therefore, it outperforms generators and the like in terms of installation capability. However, since the logic state is not stable when...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/16B60W10/06B60W10/08B60W10/26B60W20/00H02J7/14H02J7/24H02P9/04H02P9/30
CPCB60W20/00Y02T10/6286Y02T10/6217B60W10/06H02J7/14B60W2510/244B60L11/123Y02T10/7077B60W10/26B60W10/08Y02T10/7005B60L50/61Y02T10/62Y02T10/70E03B7/12H05B3/56B60W10/24B60W2510/246B60W2710/242B60W20/13Y02T10/7072
Inventor 猪口誉敏高濑康弘柴田浩司谷口真市川淳
Owner DENSO CORP
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