Power device for vehicle

Abstract

The present invention discloses a power supply device for a vehicle, which can reliably operate a fuel injection device and an ignition device and start the engine when the charging state of the battery is bad and the engine is difficult to start. An internal combustion engine; a generator (1); a battery (9) that is charged by the output of the generator (1) and supplies power to the electrical load of the vehicle; and is powered by the generator (1) and the battery (9), In addition, in a device for supplying power to a vehicle as a control unit (10) of a fuel injection device that controls fuel supplied to an internal combustion engine, there is a switch member (6) for cutting off or limiting the current flowing from the generator (1) to the battery (9) , the switch part (6) can be operated by a person.

Description

technical field [0001] The present invention relates to a power supply device for a vehicle, in particular to a power supply device for a vehicle equipped with an internal combustion engine (hereinafter referred to as an engine) having a fuel injection device, such as a two-wheeled vehicle, a marine engine, a small truck, a snowmobile, a water vehicle, etc. Power supply systems for motorcycles, etc. Background technique [0002] In an electronically controlled fuel injection device in which the control unit calculates the fuel supply amount according to the engine speed and load, and provides a drive signal to the fuel injection valve, when the battery does not have enough power after discharge, most of the power generated by the generator is used Because it is used to charge the battery, it is sometimes impossible to obtain sufficient power to operate the fuel injection device. [0003] In the case of a two-wheeled vehicle, when the battery is discharged, it is started by ...

AI Technical Summary

Problems solved by technology

[0008] However, although the state of discharge of the battery (in other words, the state of charge) is correlated with the battery voltage, for example, in the case of a 12V series battery, the state of charge is in the range of 0 to 100%, while the battery voltage varies by only 1V Left and right, in addition, when the sulfation of the battery plate occurs and the battery is in a deteriorating state, due to other correlations between the battery voltage and the charging state, the detection of the charging state based on the detected battery voltage has poor accuracy.

[0009] Thus, in the worst case, the engine will not start without proper disconnection of the alternator from the battery despite an insufficient state of charge of the battery

Furthermore, the system is complicated due to the need for a pedal component detection component, which sometimes leads to high cost and reduced reliability

[0010] In particular, when a fuel pump and an injection unit having an injector function are used as disclosed in Patent Document 2, since the instantaneous current consumption when the injection unit is driven is large, the engine cannot be started when the state of charge of the battery is insufficient. Difficult, when using the control unit to automatically cut off the current path from the generator to the battery, it is necessary to determine the correct state of charge, but as mentioned above, it is difficult to accurately grasp the state of charge of the battery according to the battery voltage

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