Power supply unit control device for internal combustion engine driven vehicle and internal combustion engine driven vehicle equipped with power supply unit control device
View Patent ↗There are provided a power supply unit control device for an internal combustion engine driven vehicle provided with a lamp driving switch for turning lamp-driving current supplied to a vehicle headlamp from a battery charged by the output of an AC generator driven by an internal combustion engine and with a conducting control unit for controlling the lamp driving switch. The conducting control unit normally performs on/off control of the lamp driving switch at a normal duty ratio, the normal duty ratio being an on/off duty ratio for the lamp driving switch at which lamp-driving current can be kept at a value not impeding the charging of the battery, and, when the internal combustion engine decelerates, performs engine deceleration lamp conducting control, in which on/off control of the lamp driving switch at the normal duty ratio is interrupted and the lamp driving switch is controlled so that lamp-driving current necessary to suppress reductions in the brightness of the headlamp is sent to the headlamp, only for a limited length of time.
1. A power supply unit control device for an internal combustion engine driven vehicle, the device being provided with: a battery charging control unit for controlling the charging of a battery of a power supply unit of an internal combustion engine driven vehicle provided with a magnetic AC generator driven by an internal combustion engine for driving the vehicle and a battery charged by the output of the AC generator; a lamp driving switch for turning a lamp-driving current supplied from the battery to a headlamp of the vehicle on and off; and a lamp conducting control unit for performing PWM control of the lamp-driving current fundamentally by performing on/off control of the lamp driving switch using a normal duty ratio, the normal duty ratio being an on/off duty ratio for the lamp driving switch set so as to keep the lamp-driving current at a value in a range such that an output voltage equal to or greater than a terminal voltage of the battery is generated by the magnetic AC generator, wherein
the lamp conducting control unit is configured so as: to cause a timer to begin measuring a set time when the rotational speed of the internal combustion engine decreases to a set rotational speed in a process in which the rotational speed of the internal combustion engine decreases towards an idling rotational speed during deceleration; and to fix the on/off duty ratio of the lamp driving switch at a set duty ratio set to a value greater than a normal duty ratio used by the internal combustion engine during idling while the timer is measuring the set time to perform on/off control of the lamp driving switch, thereby interrupting on/off control of the lamp driving switch at the normal duty ratio and performing engine deceleration lamp conducting control, in which the lamp driving switch is controlled so that lamp-driving current necessary to suppress decreases in headlamp brightness is sent to the headlamp, only for a limited period of time.
2. The power supply unit control device for an internal combustion engine driven vehicle according to claim 1 , wherein the set duty ratio is set equal to a normal duty ratio at the set rotational speed.
3. The power supply unit control device for an internal combustion engine driven vehicle according to claim 1 , wherein the lamp conducting control unit is configured so as to gradually alter the on/off duty ratio of the lamp driving switch toward the normal duty ratio used during idling when measurement of the set time is complete.
4. A power supply unit control device for an internal combustion engine driven vehicle, the device being provided with: a battery charging control unit for controlling the charging of a battery of a power supply unit of an internal combustion engine driven vehicle provided with a magnetic AC generator driven by an internal combustion engine for driving the vehicle and a battery charged by the output of the AC generator; a lamp driving switch for turning a lamp-driving current supplied from the battery to a headlamp of the vehicle on and off; and a lamp conducting control unit for performing PWM control of the lamp-driving current fundamentally by performing on/off control of the lamp driving switch using a normal duty ratio, the normal duty ratio being an on/off duty ratio for the lamp driving switch set so as to keep the lamp-driving current at a value in a range such that an output voltage equal to or greater than a terminal voltage of the battery is generated by the magnetic AC generator, wherein
the battery charging control unit is configured so as to perform acceleration charging stop control, in which battery charging is stopped, when it is detected that the vehicle is being accelerated and
the lamp conducting control unit is configured so as: to interrupt on/off control of the lamp driving switch at the normal duty ratio in a process in which the rotational speed of the internal combustion engine decreases towards an idling rotational speed during deceleration, and perform engine deceleration lamp conducting control, in which the lamp driving switch is controlled so that lamp-driving current necessary to suppress decreases in headlamp brightness is sent to the headlamp, only for a limited period of time; and to perform acceleration duty control, in which the duty ratio is increased to an acceleration control duty ratio set to a value equal to or greater than that of a normal duty ratio immediately prior to the starting of acceleration charging stop control when the acceleration charging stop control is being performed.
5. The power supply unit control device for an internal combustion engine driven vehicle according to claim 4 , wherein the lamp conducting control unit is configured so as to use a map showing a relationship between the rotational speed of the internal combustion engine and the acceleration control duty ratio during acceleration charging stop control, and to search the map with regard to the rotational speed of the internal combustion engine in order to determine the acceleration control duty ratio.
6. The power supply unit control device for an internal combustion engine driven vehicle according to claim 4 , wherein the lamp conducting control unit is configured so as to determine the acceleration control duty ratio by adding a constant value to a normal duty ratio immediately prior to the starting of acceleration charging stop control.
7. The power supply unit control device for an internal combustion engine driven vehicle according to claim 4 , wherein the lamp conducting control unit is configured so as to monitor the voltage of the battery when the acceleration charging stop control is being performed, and determine the acceleration control duty ratio according to the battery voltage to keep headlamp brightness at a brightness immediately prior to the starting of acceleration charging stop control.