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Power supply system for vehicle

A power supply system and vehicle technology, applied in road vehicle drive control systems, electric braking systems, vehicle energy storage, etc., can solve the problems of reduced storage capacity of lead-acid batteries, improve fuel efficiency, avoid falling into insufficient charging, and reduce forced The effect of recharging opportunities

Inactive Publication Date: 2018-08-21
HONDA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the power supply system for vehicles described above, during the simultaneous charging as described above, for example, when the vehicle speed decreases and the generated current of the generator decreases, the lead storage battery with a higher potential may change from the charged state to Transition to a discharge state where the storage capacity of the lead-acid battery decreases unexpectedly despite power generation

Method used

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no. 1 Embodiment approach

[0061] Hereinafter, the first embodiment of the present invention will be described with reference to the drawings.

[0062] figure 1 It is a figure which shows the structure of the power supply system S of this embodiment. The power supply system S is for a vehicle, and is installed in a vehicle not shown in the figure that has an engine as a powertrain. The power supply system S supplies electric power to various electric loads installed in the vehicle, or charges and uses electric power generated by a generator installed in the vehicle.

[0063] The power supply system S includes: a motor generator 1 as a generator; a battery module 3 including a first battery 2 as a first power storage device and a second battery 5 as a second power storage device; and a battery controller 7 to control Battery module 3.

[0064] The motor generator 1 is connected to a crank shaft of an engine (not shown) via a power transmission mechanism such as a belt or a pulley. The motor generator 1 uses ...

no. 2 Embodiment approach

[0115] Next, a second embodiment of the present invention will be described with reference to the drawings.

[0116] Figure 5 It is a flowchart showing a specific flow of switch control in the power supply system of this embodiment. The power supply system of the present embodiment is different from the power supply system of the first embodiment in that it further includes a voltage sensor that detects the voltage of the confluence part, and a part of the specific flow of switching control is different, and the other structures are the same. In addition, Figure 5 The processing of S31 and S36-S42 in the processing of S31-S41 shown are the same as those of Figure 4 The processing of S11 and S15 to S21 are the same, so detailed description is omitted.

[0117] If the determination of S31 is YES, that is, if simultaneous charging of the first battery and the second battery is currently being performed, the battery controller uses the voltage sensor to obtain the current bus voltag...

no. 3 Embodiment approach

[0124] Next, a third embodiment of the present invention will be described with reference to the drawings.

[0125] Image 6 It is a flowchart showing a specific flow of charge control of the first battery and the second battery in the power supply system of this embodiment. The power supply system of this embodiment is different from the power supply system of the first embodiment in that it further includes a voltage sensor that detects the voltage of the confluence part, and a part of the specific flow of charging control is different, and the other structures are the same.

[0126] In S51, the battery controller determines whether it is just after the start of regenerative power generation. If the determination of S51 is YES, the battery controller still keeps the first switch off and turns on the second switch to start priority charging of the second battery (see S52).

[0127] Here, in the power supply system of the first embodiment, immediately after the start of regenerative...

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Abstract

The invention provides a power supply system for a vehicle, capable of charging two storage batteries through a power generator to prevent insufficient power charging of storage batteries with low voltage. The power supply system includes a motor generator capable of performing regenerative power generation when a vehicle decelerates, first and second batteries connected in parallel to the motor generator, a first switch for connecting or disconnecting a first power supply line connecting the second battery and the motor generator to or from the first battery, and a second switch disposed in the first power supply line. An open circuit voltage of the first battery is controlled to be higher than that of the second battery. The power supply system turns on the first and second switches andstarts simultaneous charging of the first and second batteries when regenerative power generation is started, and then turns off the first switch and starts preferential charging of the second batteryat a timing based on a charging current indicating a charging state of the first battery.

Description

Technical field [0001] The invention relates to a power supply system for vehicles. In more detail, the present invention relates to a vehicle power supply system including a generator capable of generating electricity while the vehicle is running, and two storage batteries connected to the generator. Background technique [0002] The vehicle power supply system stores the electric power generated by the generator during the running of the vehicle in a storage device such as a secondary battery or a capacitor, and supplies it to various electrical loads mounted in the vehicle (such as Used to drive the vehicle (motor) or air conditioner (air conditioner) or lights (1ight) and other accessories). In recent years, a power supply system for a vehicle has been proposed, which includes two or more power storage devices with different characteristics, and uses the power storage devices separately according to loads that require electric power. [0003] For example, Patent Document 1 di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60R16/033H02J7/00
CPCB60R16/033H02J7/00B60W10/08B60W10/26B60W20/14B60L58/20H02J7/14B60L7/18B60L2240/547B60L2240/80B60L58/13H02J7/1423B60W2710/244Y10S903/906Y02T10/70H02J7/0048H02J7/16B60K6/26B60W20/00B60Y2200/92B60Y2300/91B60K2006/268
Inventor 小泉裕纪
Owner HONDA MOTOR CO LTD
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