JP6448828B1 - VEHICLE GENERATOR CONTROL DEVICE AND VEHICLE GENERATOR CONTROL SYSTEM USING THE SAME - Google Patents

Abstract

When a voltage selected by an engine control device reaches a battery voltage, generation of vibrations and abnormal noise due to an oscillation phenomenon in which power generation is alternately switched on / off is eliminated, and both oscillation prevention and intermittent control are achieved.
Control of a vehicular generator that adjusts a generated voltage to a predetermined voltage by performing on / off control of a field current at a constant period and performs variable control of the adjusted voltage by an input signal from an engine control device. In the apparatus, when the input signal from the engine control device 4 changes so that the field current changes from off to on, the input signal changes without waiting for the field current to be turned on by the on / off control at a fixed period. The field current is turned on at the same timing.
[Selection] Figure 1

Description

  The present invention relates to a control device for a vehicular generator that controls a generated voltage of a dynamo that is rotationally driven by an internal combustion engine of the vehicle, and a control system for a vehicular generator using the vehicular generator.

  As a control device for a vehicular generator used in a vehicular generator control system, for example, as disclosed in Patent Document 1, the output voltage of the generator is switched to a higher value during high-speed traveling above a certain speed. Thus, there has been proposed a control device that promotes charging of the battery and suppresses the charging frequency of the battery by switching the output voltage of the generator to a lower level when traveling at a speed lower than a predetermined speed. In this case, if it is determined that the vehicle speed is equal to or higher than the predetermined value, the control level of the output voltage of the generator is switched from L level to H level in two stages.

  As described above, in the control method in which the power generation voltage is selected from suitability (for example, 14.5 V) / minimum (for example, 12.6 V), the voltage selected by the engine control device (hereinafter referred to as ECU) is the battery voltage. Therefore, an oscillation phenomenon occurs in which power generation is alternately switched on / off, which causes a problem in that the vehicle emits vibrations and abnormal sounds, causing discomfort to the passenger.

As a solution to this problem, for example, Patent Document 2 discloses a control device for a vehicular generator that attempts to solve an oscillation phenomenon using periodic control.
A control device for a vehicle generator disclosed in Patent Document 2 includes a battery charged by a rectified output of a generator having a field coil, and on / off according to the output voltage of the generator or the voltage of the battery. A power transistor that is turned on / off by a control transistor that controls the field current of the field coil, a first transistor that is controlled by the control transistor and operates the power transistor in phase, and the control A holding circuit composed of a second transistor connected in parallel with the transistor for operation and controlled by the first transistor to hold the operation of the power transistor, and the holding operation of the holding circuit is output with a trigger pulse of a fixed period In this case, a release circuit for releasing is provided. Note that the release circuit includes a periodic pulse generator that generates a trigger pulse having a constant period.

  That is, the control device for a vehicular generator disclosed in Patent Document 2 holds the operation of the power transistor that controls the field current by the on / off operation in the holding circuit, and this holding state is maintained at a constant cycle by the release circuit. By configuring it to be canceled by the trigger pulse, the on / off frequency of the power transistor matches the frequency of the trigger pulse and becomes a constant frequency, and is stable against changes in the generator rotation speed and generator output current. It was made to become.

  Further, as a technique aimed at improving the power generation efficiency of the vehicular generator, for example, as disclosed in Patent Document 3, an ECU is connected to the ECU in accordance with an increase in engine torque. Some devices perform on / off control that gradually increases the duty (power generation amount) of a terminal (hereinafter referred to as a C terminal) of a control device of the machine.

JP 7-298514 A JP-A-1-218333 JP 2008-184917 A

  However, when the control technique disclosed in Patent Document 3 is applied to the vehicle generator control device disclosed in Patent Document 2, as shown in the timing chart of FIG. When the period of the trigger pulse generated by the unit is Ta and the period of the input pulse to the C terminal selected by the ECU is Tb, the selector that selects the period Ta and the period Tb is canceled when Tb ≧ Ta. The trigger pulse output from the circuit is selected. Then, the pulse signal input to the C terminal is not reflected on the power transistor (T3 in FIG. 3), and when the voltage selected by the ECU reaches the battery voltage, the oscillation phenomenon in which the on / off of power generation is alternately switched is prevented. There is a problem that it is impossible to achieve both on / off control for gradually increasing the power generation amount at the C terminal.

  In FIG. 3, (a) is a pulse generated by a periodic pulse generator constituting the release circuit, (b) is an input pulse to the C terminal selected by the ECU, and (c) is a control based on an input pulse to the C terminal. (D) is a voltage of a terminal (hereinafter referred to as a B terminal) of a control device for a vehicle generator to which a battery is connected, that is, a B terminal voltage, and (e) is a B terminal voltage and a C terminal. The control voltage based on the input pulse of B is compared, and the B terminal voltage <the output of the control voltage detection unit detecting that the control voltage is based on the input pulse to the C terminal <the output of the control voltage, (f) The output of the field coil drive signal generation part to drive is shown. In FIG. 3, symbols T1 ', T2', and T3 'indicate periods.

  The present invention has been made to solve the above-described problems, and prevents an oscillation phenomenon caused by alternately switching on / off of power generation, and gradually increases the amount of power generation for a vehicle generator. An object of the present invention is to provide a control device for a vehicular generator that can achieve both off / off control and a control system for a vehicular generator using the same.

The control device for a vehicular generator according to the present invention adjusts the generated voltage to a predetermined voltage by performing on / off control of the field current at a constant cycle, and variably controls the adjusted voltage by an input signal from the engine control device. In a control device for a vehicle generator that performs
When the input signal from the engine control device changes so that the field current changes from off to on, the input signal changes without waiting for the field current to be turned on by the on / off control of the fixed period. The field current is turned on at the same timing.

  According to the control device for a vehicular generator according to the present invention, the power generation amount for the vehicular generator is gradually increased while adopting the periodic control for suppressing the oscillation phenomenon caused by the on / off of the power generation being switched alternately. ON / OFF control that increases the power consumption can be adopted, and the power generation efficiency can be improved without generating vibration or noise to the passenger.

It is a block diagram of the control system explaining the control apparatus of the generator for vehicles concerning Embodiment 1 of this invention. It is a timing chart explaining operation | movement of the control apparatus of the generator set for vehicles which concerns on Embodiment 1 of this invention. It is a timing chart explaining operation | movement of the control apparatus of the generator for vehicles which concerns on a prior art.

  BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of a control device for a vehicle generator and a control system for a vehicle generator using the same according to the present invention will be described below in detail with reference to the drawings.

Embodiment 1 FIG.
FIG. 1 is a configuration diagram of a control system for explaining a control device for a vehicle generator according to Embodiment 1 of the present invention, from a symbol a attached to each of FIGS. 1 (a) and 1 (b). By connecting the d's, the entire system configuration is explained.
In FIG. 1, the code | symbol 1 shows the generator for vehicles, and the code | symbol 2 has shown the control apparatus of the generator for vehicles. A battery 3 is connected to the vehicle generator 1, and an engine ECU (hereinafter referred to as an ECU as in the description of the background art) 4 is connected to the control device 2 of the vehicle generator. The battery 3 is also connected to the control device 2 for the vehicular generator.

  The vehicle generator 1 includes a vehicle generator control device 2 and also includes a stator coil 5 and a field coil 6. The stator coil 5 and the field coil 6 are magnetically coupled, and the stator coil 5 is connected to the battery 3 via the rectifying unit 7. The rectification unit 7 is connected to the negative terminal of the battery 3 via the positive terminal of the battery 3 and a vehicle body (not shown).

  The vehicle generator control device 2 includes a connection terminal 8 (hereinafter referred to as a B terminal) for connection to a battery 3 and a connection terminal 9 (hereinafter referred to as an F terminal) for connection to a field coil. The vehicle generator control device 2 also has an input terminal 10 for inputting an instruction value of a voltage signal that is a target value of the battery 3 from the ECU 4 to the vehicle generator control device 2 (hereinafter, description of the background art). And an output terminal 11 (hereinafter referred to as an FR terminal) for feeding back the current signal of the field coil 6 to the ECU 4. The ECU 4 and the C terminal 10 are connected by a wire harness or the like, and the vehicle generator control device 2 receives an instruction of the target value of the battery 3 from the ECU 4 via the C terminal 10.

  Further, the vehicle generator control device 2 includes a filter 12 such as a low-pass filter (LPF) connected to the C terminal 10, a control voltage selector 13 connected to the filter 12, and a control. Similar to the voltage selection unit 13, a logic detection unit (hereinafter referred to as a C terminal logic rising detection unit) 14 connected to the filter 12 is connected between the B terminal 8 and the control voltage selection unit 13 by a wire harness or the like. Comparison voltage detection unit 15, field coil drive signal generation unit 16 connected to comparison voltage detection unit 15, periodic pulse generation unit 17 that generates a pulse having a constant period, periodic pulse generation unit 17, and C terminal A release pulse generation unit (hereinafter referred to as an OR unit) that outputs the logical sum of the two output signals of the logic rise detection unit 14 to the field coil drive signal generation unit 16 as an ON logic. ) It is provided with a 18, a.

  The field coil drive signal generation unit 16 includes a power transistor that is connected to the field coil 6 via the F terminal 9 and controls a field current by an on / off operation. The comparison voltage detection unit 15 includes: A control transistor for controlling conduction of the power transistor is provided. The drive signal generated by the field coil drive signal generation unit 16 is output to the field coil 6 through the F terminal 9 and becomes a feedback signal to the ECU 4 through the FR terminal 11.

  The filter 12 removes noise contained until the voltage signal output from the ECU 4 is input to the C terminal 10, and the voltage signal from which the noise has been removed is detected by the control voltage selection unit 13 and the C terminal logic rise detection. Input to the unit 14. The C terminal logic rise detection unit 14 detects the rise of the voltage signal at the C terminal 10, and the control voltage selection unit 13 adjusts the vehicle generator 1 based on the on / off logic of the voltage signal output from the filter 12. A voltage signal corresponding to the power generation target voltage, which is a voltage signal, is generated.

  A voltage signal corresponding to the power generation target voltage generated by the control voltage selection unit 13 is input to the comparison voltage detection unit 15. The comparison voltage detection unit 15 compares the B terminal voltage, which is a battery voltage, with the control voltage generated by the control voltage selection unit 13, and generates a field coil drive signal with the OFF logic when the B terminal voltage <the control voltage. To the unit 16.

Next, the operation of the control device for the vehicle generator according to the first embodiment will be described.
An instruction for the target value of the battery 3 is input as a voltage signal from the ECU 4 to the control device 2 of the vehicular generator via the C terminal 10. The voltage signal input to the C terminal 10 is subjected to noise removal by the filter 12 and input to the control voltage selection unit 13 and the C terminal logic rise detection unit 14.

  The C terminal logic rise detection unit 14 detects the rise of the voltage signal input to the C terminal 10 based on the voltage signal output from the filter 12. The control voltage selection unit 13 generates a signal corresponding to the power generation target voltage of the vehicular generator 1 based on the voltage signal output from the filter 12. For example, the battery voltage is adjusted to 14.5 V when the voltage signal at the C terminal 10 is on logic (High) and 12.6 V when it is off logic (Low). A signal corresponding to the power generation target voltage generated by the control voltage selection unit 13 is input to the comparison voltage detection unit 15.

  The comparison voltage detection unit 15 is connected to the battery 3 via the B terminal 8 and compares the B terminal voltage, which is the battery voltage, with the power generation target voltage output by the control voltage selection unit 13, and the B terminal voltage < When the power generation target voltage is detected, the off-logic is output to the field coil drive signal generation unit 16. Based on the OFF logic by the comparison voltage detector 15, a current flows through the field coil 6, and a generated voltage is output from the stator coil 5. That is, when the input signal from the ECU 4 changes so that the field current is turned on from off, the field current is not turned on by the on / off control of the fixed period generated by the periodic pulse generator 17. The field current is turned on at the timing when the input signal from the ECU 4 changes.

  On the other hand, the voltage signal which is the target value of the battery 3 input to the C terminal logic rise detection unit 14 is input to the OR unit 18. A pulse having a constant cycle is also input to the OR unit 18 from the periodic pulse generation unit 17, and a logical sum of the two inputs is output from the OR unit 18 to the field coil drive signal generation unit 16 as ON logic. When this ON logic is input, the field coil drive signal generator 16 blocks the current flowing in the field coil 6 and stops the output of the generated voltage from the stator coil 5. Note that when the ON logic from the OR unit 18 and the OFF logic from the comparison voltage detection unit 15 are output at the same time, the ON logic from the OR unit 18 is prioritized.

  Next, a description will be given using the timing chart of FIG. In the timing chart of FIG. 2, in order to help understanding, the output of the field coil drive signal generator according to the prior art shown in FIG. 3 is also shown in the lower stage of the output of the field coil drive signal generator according to the first embodiment. Show. 2, (a) is a pulse generated by the periodic pulse generation unit 17, (b) is an input pulse to the C terminal 10 selected by the ECU 4, (c) is an output of the C terminal logic rise detection unit 14, (D) is the control voltage based on the input pulse to the C terminal 10, (e) is the voltage at the B terminal 8, that is, the B terminal voltage, (f) is the output of the comparison voltage detector 15, and (g) is the field. The output of the magnetic coil drive signal generation part 16 is shown. Note that (h) corresponds to (f) in FIG. 3 and shows the output of the field coil drive signal generation unit 16 according to the prior art. In FIG. 2, symbols T1 ', T2', and T3 'indicate periods.

  In this timing chart, 14.5V is used when the C terminal 10 is H logic, and 12.6V when the C terminal 10 is L logic. However, this is only an example, and the H / L assignment and the selected voltage are as follows. The voltage is predetermined by the vehicle system. The period of the periodic pulse generator 17 is a predetermined period and is uniquely determined by the vehicle system.

  The periodic pulse generator 17 generates a pulse with a period Ta. By using the input of the C terminal logic rising detection unit 14 as the ON logic input to the field coil drive signal generation unit 16, the ON logic is generated by the pulse of the periodic pulse generation unit 17 in a steady state (T 2 ′ in FIG. 2). And ON / OFF control (T1 ′ in FIG. 2) is performed, the ON logic is generated using the output of the C terminal logic rising edge detection unit 14 and the pulse of the periodic pulse generation unit 17.

Next, the operation will be described along the timings TA, TB, TC, TD, and TE in the timing chart.
At a timing TB when the output of the field coil drive signal generation unit 16 becomes ON logic (High) and the output of the comparison voltage detection unit 15 becomes OFF logic (Low) due to the pulse generated at the timing TA at the period Ta. The output of the field coil drive signal generation unit 16 becomes OFF logic (Low).

  At timing TC, since cycle Ta <cycle Tb, in the prior art, the pulse of the periodic pulse generator 17 is used to assert the output of the field coil drive signal generator 16, and therefore the field coil drive signal generator 16 Could not be asserted. However, in the first embodiment, at the timing TC when the logic of the C terminal 10 changes from OFF logic (Low) to ON logic (High), the output of the C terminal logic rise detection unit 14 is asserted, and the field coil drive signal generation is performed. The output of the unit 16 becomes ON logic (High).

  Even when the logic of the C terminal 10 does not change, the periodic pulse generator 17 always generates a pulse of the period Ta. Therefore, if the output of the control voltage selector 13 is ON logic (High), the timing TD As shown in FIG. 3, the output of the field coil drive signal generator 16 is turned on (High), and the field coil drive signal generator is generated at a timing TE when the output of the control voltage selector 13 is turned off (Low). The output of 16 becomes OFF logic (Low).

  Thus, according to the vehicle generator control device and the vehicle generator control system using the same according to the first embodiment, the oscillation phenomenon caused by the on / off switching of power generation is suppressed. It is possible to adopt on / off control that gradually increases the amount of power generation for the vehicle generator while adopting periodic control to achieve power generation efficiency without causing vibration or noise to the passenger be able to.

  Although one embodiment according to the present invention has been described above, the present invention is not limited to this, and the embodiment may be appropriately modified or omitted without departing from the gist of the present invention. Is possible.

DESCRIPTION OF SYMBOLS 1 Vehicle generator, 2 Vehicle generator control device, 3 Battery, 4 Engine ECU, 5 Stator coil, 6 Field coil, 7 Rectifier, 8 Connection terminal (B terminal), 9 Connection terminal (F terminal) 10 input terminal (C terminal), 11 output terminal (FR terminal), 12 filter, 13 control voltage selection unit, 14 logic detection unit (C terminal logic rising detection unit), 15 comparison voltage detection unit, 16 field coil drive Signal generation unit, 17 period pulse generation unit, 18 release pulse generation unit (OR unit), TA, TB, TC, TD, TE timing, Ta, Tb period, T1, T2, T3, T1 ′, T2 ′, T3 ′ period.

Claims (5)

Control of a vehicle generator that adjusts the generated voltage to a predetermined voltage by on / off-controlling the field current flowing in the field coil at a constant period, and performs variable control of the adjusted voltage by an input signal from the engine control device In the device
When the input signal from the engine control device changes so that the field current changes from off to on, the input signal does not wait for the field current to be turned on by the on / off control of the constant period. A control device for a vehicle generator, wherein the field current is turned on at the changed timing. A field coil drive signal generator connected to the field coil to control the field current;
A control voltage selection unit that generates an adjustment voltage signal corresponding to the output voltage of the vehicular generator based on an input signal from the engine control device;
A comparison voltage detection unit that detects an adjustment voltage signal generated by the control voltage selection unit and outputs a conduction holding signal of the field current to the field coil drive signal generation unit;
A logic detection unit for detecting that an input signal from the engine control device has changed;
A periodic pulse generator for generating a pulse with a constant period;
A release pulse generation unit that releases the output of the conduction holding signal to the field coil drive signal generation unit by a logical sum of the output signal of the logic detection unit and the output signal of the periodic pulse generation unit;
A control device for a vehicular generator, comprising:   The comparison voltage detection unit compares the battery voltage supplied to the vehicle generator with the adjustment voltage generated by the control voltage selection unit, and generates the field coil drive signal when battery voltage <control voltage. The vehicle generator control device according to claim 2, wherein the field current conduction holding signal is output to a section.   4. The vehicle generator according to claim 2, wherein the field coil drive signal generation unit includes a power transistor, and the comparison voltage detection unit includes a control transistor that controls conduction of the power transistor. 5. Control device. A control device for a vehicle generator according to any one of claims 1 to 4,
Battery,
A vehicle generator control system comprising: a vehicle generator having the field coil and a stator coil magnetically coupled to the field coil.

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