JP6703336B1 - Generator control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a generator control device capable of measuring the number of revolutions of an engine even when a leak current occurs in the generator system. A generator control device measures an engine speed based on a generated voltage, which is one-phase AC voltage of a three-phase AC voltage generated by a stator coil of the generator, and determines the generated voltage and , The non-crossing state that the non-crossing state where the threshold voltage does not cross continues is measured, and the power generation command is output by outputting the power generation command based on the measured non-crossing state continuous time, and the power generation command is issued. After the output, if the power generation voltage and the threshold voltage cross each other, the power generation stop command is output to stop the power generation by the generator. [Selection diagram] Figure 1

Description

The present invention relates to a generator control device.

In a conventional generator system, it is known that the generator will generate power to some extent even in situations where power generation is unnecessary, such as when the voltage of the battery that stores the power generated by the generator is greater than the target value of the battery voltage. (For example, see Patent Document 1).

Japanese Patent No. 3866013

Here, the magnitude relationship between the threshold voltage and the generated voltage generated by the generator that rotates in synchronization with the rotation of the engine is compared, and the pulse signal output according to the comparison result is used to Consider a generator system configured to measure speed. In such a generator system, if the above-mentioned control is applied in a situation where power generation is unnecessary, the pulse signal continues to be output, so that the engine speed can be continuously measured.

However, when a leak current occurs in the generator system described above, a phenomenon in which the ground potential floats, that is, a ground shift occurs due to the leak current. As a result, the waveform of the generated voltage exceeds the threshold voltage described above even if the control described above is applied in a situation where power generation is unnecessary. In this case, even if the generated voltage is compared with the threshold voltage, the generated voltage always becomes larger than the threshold voltage, and as a result, the output of the pulse signal is stopped and the engine speed cannot be measured. .. Therefore, even if a leak current occurs in the generator system described above, a new technique is required for making it possible to measure the engine speed in a situation where power generation is unnecessary.

The present invention has been made to solve the above problems, and a generator control device capable of measuring the engine speed even when a leak current occurs in the generator system. Aim to get.

A generator control device according to the present invention includes a field current control unit that controls a field current flowing through a field coil of a generator, and a one-phase AC voltage generated by a stator coil of the generator. Measures the non-crossing state duration time in which the non-crossing state where the generation voltage, which is an AC voltage, and the threshold voltage are non-crossing continues, and outputs the power generation command based on the measured non-crossing state duration time. After the output, if the power generation voltage and the threshold voltage cross each other, a floating determination unit that outputs a power generation stop command and a rotation speed measurement unit that measures the engine speed based on the power generation voltage are provided. The control unit, when receiving a power generation command from the floating determination unit, causes the generator to generate power by supplying a field current to the field coil, and when receiving a power generation stop command from the floating determination unit, the field coil to the field coil is received. By interrupting the current flow, the generator stops the power generation.

According to the present invention, it is possible to obtain a generator control device capable of measuring the number of revolutions of an engine even when a leak current occurs in the generator system.

It is a block diagram which shows the generator system in Embodiment 1 of this invention. 3 is a flowchart showing a series of processes performed by the generator control device according to Embodiment 1 of the present invention. 3 is a timing chart showing an example of a waveform of a temporal change in a generated voltage input to the generator control device according to Embodiment 1 of the present invention. 7 is a timing chart showing another example of the waveform of the time change of the generated voltage input to the generator control device according to Embodiment 1 of the present invention. It is a block diagram which shows the generator system in a comparative example. It is a timing chart which shows an example of the waveform of the time change of the generation voltage input into the control device of the generator in the comparative example. 7 is a timing chart showing another example of the waveform of the temporal change in the generated voltage input to the generator control device in the comparative example.

Hereinafter, a generator control device according to the present invention will be described with reference to the drawings according to a preferred embodiment. In the description of the drawings, the same portions or corresponding portions will be denoted by the same reference symbols, without redundant description. Hereinafter, in the embodiments, a case where a generator system including a generator control device is applied to a vehicle will be illustrated.

Embodiment 1.
First, a generator control device 7A will be described as a comparative example with the generator control device 7 according to the first embodiment of the present invention. FIG. 5: is a block diagram which shows the generator system 1A in a comparative example. In addition, in FIG. 5, the battery 2 and the vehicle-mounted device 3 electrically connected to the generator system 1A and the engine ECU (Electronic Control Unit) 4 communicatively connected to the generator system 1A are also shown. There is.

The generator system 1A, the battery 2, the vehicle-mounted device 3, and the engine ECU 4 shown in FIG. 5 are mounted on a vehicle. The battery 2 stores the DC power supplied from the generator system 1A. The vehicle-mounted device 3 operates by the DC power supplied from the generator system 1A. The engine ECU 4 controls an engine (not shown) mounted on the vehicle.

The generator system 1A includes a generator 5, a three-phase AC rectifier 6 and a controller 7A. The generator 5 includes a rotor (not shown), a field coil 51 arranged on the rotor, a stator (not shown) arranged around the rotor, and a stator coil 52 arranged on the stator. Have and.

The rotating shaft of the rotor of the generator 5 has a structure in which the rotating shaft of the engine mounted on the vehicle is hung with a belt. With this configuration, the rotor of the generator 5 rotates in synchronization with the rotation of the engine. When current flows through the field coil 51 while the engine is rotating, the field coil 51 generates a rotating magnetic field. The rotating magnetic field generated by the field coil 51 crosses the stator coil 52, so that the stator coil 52 generates a three-phase AC voltage.

The three-phase AC rectifier 6 converts the three-phase AC voltage generated by the stator coil 52 into a DC voltage and outputs the DC voltage to the battery 2 and the vehicle-mounted device 3, respectively.

The control device 7A is communicatively connected to the engine ECU 4 so that one-way communication from the engine ECU 4 to the control device 7A or two-way communication between the engine ECU 4 and the control device 7A is possible. The engine ECU 4 transmits the battery target voltage, which is the target value of the voltage of the battery 2, to the control device 7A by a communication protocol, for example, LIN (Local Interconnect Network).

The control device 7A includes a reception unit 71, a voltage generation unit 72, a comparison unit 73, a field current control unit 74, a rotation speed measurement unit 75A, and a floating determination unit 76A.

The receiver 71 receives the battery target voltage from the engine ECU 4, and outputs the received battery target voltage to the voltage generator 72. The voltage generator 72 generates the battery target voltage output by the receiver 71 as a control voltage, and outputs the generated control voltage to the comparator 73.

The battery voltage, which is the voltage of the battery 2, is input to the comparison unit 73. The comparison unit 73 compares the input battery voltage with the control voltage output by the voltage generation unit 72, and outputs the comparison result to the field current control unit 74.

The field current controller 74 controls the operation of the generator 5 by controlling the field current flowing through the field coil 51 of the generator 5. That is, when the battery voltage is less than the control voltage, the field current control unit 74 energizes the field coil 51 with the field current to set the mode of the generator 5 to the power generation mode. The power generation mode is a mode in which the power generator 5 generates power. In this way, when the generator 5 generates power, the battery voltage rises.

When the battery voltage is equal to or higher than the control voltage, the field current control unit 74 shuts off the field current to the field coil 51 to set the mode of the generator 5 to the stop mode. The stop mode is a mode in which the generator 5 stops power generation.

When controlling the generator 5 to be in the power generation mode, the field current control unit 74 energizes the field coil 51 according to the engine speed output by the rotation speed measurement unit 75A described later. By limiting the amount of magnetic current, the power generation amount of the generator 5 is adjusted.

The field current control unit 74 sets the mode of the generator 5 to the floating mode when receiving a command from the floating determination unit 76A described later. The floating mode is a mode in which the state of the power generator 5 is switched between a state in which the power generator 5 generates power and a state in which the power generator 5 stops power generation.

The rotation speed measurement unit 75A is configured to measure the engine rotation speed, which is the rotation speed of the engine. Here, the generator 5 is a generator that converts engine torque into electric power. Therefore, when the torque of the engine is low, for example, when the generator 5 generates power when the engine starts to start, there is a concern that the engine may stop. Therefore, the control device 7A is configured to include the rotation speed measurement unit 75A. As a result, the control device 7A can adjust the power generation amount of the power generator 5 according to the engine speed.

The rotation speed measurement unit 75A includes a comparison unit 751 and a measurement unit 752. To the comparison unit 751, the generated voltage, which is one-phase AC voltage of the three-phase AC voltage generated by the stator coil 52 of the generator 5, is input, and the threshold voltage Vth1 is also input. The threshold voltage Vth1 is a predetermined fixed value.

The comparison unit 751 compares the magnitude relationship between the generated voltage and the threshold voltage Vth1 and outputs the comparison result to the measurement unit 752.

The measuring unit 752 measures a cycle, which is the sum of the time during which the state where the generated voltage is equal to or higher than the threshold voltage Vth1 continues and the time when the state where the generated voltage remains below the threshold voltage Vth1 continues after this state. That is, the comparison unit 751 outputs a pulse signal corresponding to the periodic change in the generated voltage as the above-mentioned comparison result, and the measurement unit 752 measures the period of this pulse signal. The measuring unit 752 measures the frequency of the generated voltage, that is, the engine speed by measuring such a period. The measuring unit 752 outputs the measured engine speed to the field current control unit 74.

The floating determination unit 76A includes a comparison unit 761 and a measurement unit 762. The above-described generated voltage is input to the comparison unit 761, and the threshold voltage Vth2 that is larger than the threshold voltage Vth1 is input. The threshold voltage Vth2 is a predetermined fixed value.

The comparison unit 761 compares the generated voltage with the threshold voltage Vth2 and outputs the comparison result to the measurement unit 762.

The measuring unit 762 measures the time during which the state in which the generated voltage is lower than the threshold voltage Vth2 continues, and outputs a power generation command to the field current control unit 74 if the measured time reaches the threshold time Tth. When the field current control unit 74 receives a power generation command from the measurement unit 762, the field current is supplied to the field coil 51 to cause the generator 5 to generate power. As a result, the mode of the generator 5 is switched from the stop mode to the floating mode. The threshold time Tth is a predetermined fixed value.

After outputting the power generation command, the measuring unit 762 outputs a power generation stop command to the field current control unit 74 when the power generation voltage becomes equal to or higher than the threshold voltage Vth2. When receiving the power generation stop command from the measuring unit 762, the field current control unit 74 cuts off the application of the field current to the field coil 51 to cause the generator 5 to stop power generation.

After outputting the power generation stop command, the measuring unit 762 outputs the power generation command to the field current control unit 74 if the threshold time Tth elapses after the power generation voltage becomes equal to or higher than the threshold voltage Vth2. When the field current control unit 74 receives a power generation command from the measurement unit 762, the field current is supplied to the field coil 51 to cause the generator 5 to generate power.

Next, an example of the operation of the power generator 5 controlled by the control device 7A in the comparative example will be described with reference to FIG. FIG. 6 is a timing chart showing an example of a waveform of a temporal change in the generated voltage input to the generator control device 7A in the comparative example.

When the battery voltage is lower than the control voltage, the mode of the generator 5 is the power generation mode, as shown in FIG. That is, while the battery voltage is lower than the control voltage, the power generation by the generator 5 is continued.

When the battery voltage becomes equal to or higher than the control voltage, the mode of the generator 5 switches from the power generation mode to the stop mode. That is, when the battery voltage becomes equal to or higher than the control voltage, the power generation by the generator 5 stops. When the power generation by the generator 5 is stopped, the generated voltage gradually attenuates according to the time constant of the stator coil 52.

When the time during which the state in which the generated voltage becomes lower than the threshold voltage Vth2 continues reaches the threshold time Tth, the mode of the generator 5 switches from the stop mode to the floating mode.

Here, if the power generation by the generator 5 is stopped, the generated voltage gradually attenuates according to the time constant of the stator coil 52 as described above, and eventually the waveform of the generated voltage becomes the threshold voltage Vth1. It will fall below. In this case, since the output of the pulse signal from the comparison unit 751 of the rotation speed measurement unit 75A is stopped, the measurement unit 752 cannot measure the engine rotation speed. On the other hand, when the mode of the generator 5 is switched from the stop mode to the floating mode, power generation by the generator 5 is forcibly started, and as a result, the waveform of the generated voltage intersects with the threshold voltage Vth1. As a result, the pulse signal output from the comparison unit 751 continues, and the measurement unit 752 can measure the engine speed.

However, the floating mode is a mode in which power generation is not required in the first place. Therefore, when the power generation voltage is equal to or higher than the threshold voltage Vth2 while the power is being generated by the power generator 5, the power generation by the power generator 5 is stopped. When the power generation by the generator 5 is stopped, the generated voltage gradually attenuates according to the above time constant. When the threshold time Tth elapses after the generated voltage becomes equal to or higher than the threshold voltage Vth2, the power generation by the generator 5 is performed again.

As described above, the floating mode is intended to enable the rotation speed measurement unit 75A to measure the engine rotation speed in a situation in which power generation is unnecessary, that is, in a situation in which the battery voltage is equal to or higher than the control voltage.

Next, an example of the operation of the generator 5 when a leak current occurs in the generator system 1A in the comparative example will be described with reference to FIG. FIG. 7: is a timing chart which shows another example of the waveform of the time change of the generated voltage input into 7 A of generator control devices in a comparative example.

Here, when a leak current occurs in the generator system 1A, a phenomenon that the potential of the ground rises, that is, a ground shift occurs due to the leak current. Specific examples of such a leak current include a case where a leak current occurs in the stator coil 52 and a case where a leak current occurs in the diode forming the three-phase AC rectifier 6.

As shown in FIG. 6, when the mode of the generator 5 is the stop mode, the mode of the generator 5 is set to the floating mode when the time during which the state where the generated voltage is lower than the threshold voltage Vth2 continues reaches the threshold time Tth. Switch. However, as shown in FIG. 7, when a ground shift occurs, the waveform of the generated voltage exceeds the threshold voltage Vth2 due to the ground shift. In this case, the time period during which the generated voltage remains below the threshold voltage Vth2 does not reach the threshold time Tth, so the mode of the generator 5 does not switch from the stop mode to the floating mode.

That is, in the configuration of the control device 7A in the comparative example, when the leak current occurs, the waveform of the generated voltage in the stop mode exceeds the threshold voltage Vth2, and the mode of the generator 5 does not become the floating mode. In this case, the rotation speed measurement unit 75A cannot measure the engine rotation speed. Further, in the configuration of the control device 7A in the comparative example, when the configuration in which the offset voltage for canceling the ground shift is set in consideration of the ground shift caused by the leak current is applied, the circuit scale increases. Resulting in.

Based on the above, it is desirable to devise the configuration of the control device 7A so that the engine speed can be measured in a situation in which power generation is unnecessary even when a leak current occurs. On the other hand, the control device 7 according to the first embodiment is configured to be able to measure the engine speed in a situation where power generation is unnecessary even when a leak current occurs.

Next, the generator control device 7 according to the first embodiment of the present invention will be described with reference to FIG. 1 is a configuration diagram showing a generator system 1 according to Embodiment 1 of the present invention. In describing control device 7 in the first embodiment, description of the same points as control device 7A in the above-described comparative example will be omitted, and points different from control device 7A will be mainly described. In FIG. 1, a battery 2 and an in-vehicle device 3 that are electrically connected to the generator system 1, and an engine ECU 4 that is communicatively connected to the generator system 1 are also shown.

The generator system 1, the battery 2, the in-vehicle device 3, and the engine ECU 4 shown in FIG. 1 are mounted on a vehicle. The generator system 1 includes a generator 5, a three-phase AC rectifier 6 and a controller 7.

The control device 7 includes a reception unit 71, a voltage generation unit 72, a comparison unit 73, a field current control unit 74, a rotation speed measurement unit 75, and a floating determination unit 76.

The floating determination unit 76 has a comparison unit 763 and a measurement unit 764. The threshold voltage Vth2 is input to the comparison unit 763 as well as the above-described generated voltage. The comparing unit 763 compares the generated voltage with the threshold voltage Vth2, and outputs the comparison result to the measuring unit 764. The threshold voltage Vth2 is a predetermined fixed value.

The measuring unit 764 measures the time during which the state where the generated voltage and the threshold voltage Vth2 do not cross each other continues. Hereinafter, a state in which the generated voltage and the threshold voltage Vth2 do not cross each other, that is, a state in which the generated voltage and the threshold voltage Vth2 do not cross each other, is called a non-crossing state, and a time during which the non-crossing state continues is called a non-crossing state duration time. Call. Specifically, the measurement unit 764 measures, as a non-crossing state duration time, a duration in which one of the state in which the generated voltage is higher than the threshold voltage Vth2 and the state in which the generated voltage is lower than the threshold voltage Vth2 continues.

The measuring unit 764 outputs a power generation command to the field current control unit 74 based on the measured non-intersecting state duration time. Specifically, the measuring unit 764 outputs a power generation command to the field current control unit 74 when the measured non-crossing state duration time reaches the threshold time Tth. The threshold time Tth is a predetermined fixed value.

When the field current control unit 74 receives the power generation command from the measurement unit 764, the field current is supplied to the field coil 51 to cause the generator 5 to generate power. As a result, the mode of the generator 5 is switched from the stop mode to the floating mode.

After outputting the power generation command, the measuring unit 764 outputs the power generation stop command if the power generation voltage and the threshold voltage Vth2 cross each other. Specifically, after outputting the power generation command, the measuring unit 764 outputs a power generation stop command to the field current control unit 74 if the power generation voltage becomes equal to the threshold voltage Vth2.

When receiving the power generation stop command from the measuring unit 764, the field current control unit 74 cuts off the supply of the field current to the field coil 51 to cause the generator 5 to stop power generation.

The measuring unit 764 alternately performs the above-described process of outputting the power generation command and the above-described process of outputting the power generation stop command. Therefore, the field current control unit 74 alternately performs control for causing the generator 5 to generate power and control for causing the generator 5 to stop power generation.

Here, a series of processes performed by the control device 7 after the mode of the generator 5 is switched from the power generation mode to the stop mode will be further described with reference to the flowchart of FIG. FIG. 2 is a flowchart showing a series of processes performed by the generator control device 7 according to the first embodiment of the present invention. The process of the flowchart in FIG. 2 is repeatedly performed after the mode of the generator 5 is switched to the stop mode and then switched to the power generation mode.

In step S101, the measurement unit 764 determines whether or not the non-crossing state duration time has reached the threshold time Tth, based on the comparison result output by the comparison unit 763. If it is determined that this time has reached the threshold time Tth, the process proceeds to step S102. Specifically, the measuring unit 764 continues the non-crossing state if the time during which either the state where the generated voltage is higher than the threshold voltage Vth2 or the state where the generated voltage is lower than the threshold voltage Vth2 reaches the threshold time Tth. It is determined that the time has reached the threshold time Tth.

On the other hand, if it is determined that this time has not reached the threshold time Tth, the process returns to step S101.

In step S102, the measuring unit 764 outputs a power generation command to the field current control unit 74. After that, the process proceeds to step S103.

In this way, the floating determination unit 76 outputs a power generation command to the field current control unit 74 when the non-intersecting state duration time reaches the threshold time Tth. When the field current control unit 74 receives the power generation command from the floating determination unit 76, the field current is supplied to the field coil 51 to cause the generator 5 to generate power.

In step S103, the measuring unit 764 determines whether the generated voltage and the threshold voltage Vth2 intersect based on the comparison result output by the comparing unit 763. When it is determined that the generated voltage and the threshold voltage Vth2 intersect, the process proceeds to step S104. Specifically, when the generated voltage becomes equal to the threshold voltage Vth2, the measuring unit 764 determines that the generated voltage and the threshold voltage Vth2 intersect.

On the other hand, if it is determined that the generated voltage and the threshold voltage Vth2 do not intersect, the process returns to step S102. In this case, the power generation by the generator 5 is continued.

In step S104, the measurement unit 764 outputs a power generation stop command to the field current control unit 74. Then, the process ends.

As described above, the floating determination unit 76 outputs the power generation stop command if the power generation voltage and the threshold voltage Vth2 cross after outputting the power generation command. When receiving the power generation stop command from the floating determination unit 76, the field current control unit 74 cuts off the supply of the field current to the field coil 51 to cause the generator 5 to stop power generation.

Returning to the description of FIG. 1, the rotation speed measurement unit 75 includes a filter 753, a signal generation circuit 754, and a measurement unit 755. The power generation voltage described above is input to the filter 753. The filter 753 removes the noise component superimposed on the power generation voltage, and outputs the power generation voltage after the removal to the signal generation circuit 754.

The signal generation circuit 754 performs signal processing on the generated voltage output by the filter 753 to generate a rectangular wave signal for measuring the engine speed. The signal generation circuit 754 outputs the generated rectangular wave signal to the measurement unit 755.

Here, the generated voltage output by the filter 753 includes a DC offset component due to the ground shift. The above-described signal processing is processing for removing such an offset component included in the power generation voltage and converting the power generation voltage from which the offset component is removed into a rectangular wave signal.

The above-described signal processing performed by the signal generation circuit 754 is realized by applying a known technique. Such known techniques are disclosed in, for example, Japanese Patent No. 6211120, Japanese Unexamined Patent Publication No. 2002-125398, Japanese Unexamined Patent Publication No. 10-2718897, and US Pat. No. 7,605,569.

The measuring unit 755 measures the frequency of the generated voltage, that is, the engine speed by measuring the frequency of the rectangular wave signal generated by the signal generation circuit 754. The measuring unit 755 outputs the measured engine speed to the field current control unit 74.

In this way, the rotation speed measurement unit 75 measures the engine rotation speed based on the input power generation voltage. Specifically, the rotation speed measurement unit 75 converts the input power generation voltage into a rectangular wave signal and measures the frequency of the rectangular wave signal to measure the engine rotation speed. More specifically, the rotation speed measurement unit 75 removes noise superimposed on the generated voltage before converting the generated voltage into a rectangular wave signal.

Next, an example of the operation of the generator 5 controlled by the control device 7 according to the first embodiment will be described with reference to FIG. FIG. 3 is a timing chart showing an example of a waveform of a temporal change in the generated voltage input to the generator control device 7 according to the first embodiment of the present invention.

When the battery voltage is lower than the control voltage, the mode of the generator 5 is the power generation mode, as shown in FIG. That is, while the battery voltage is lower than the control voltage, the power generation by the generator 5 is continued.

When the battery voltage becomes equal to or higher than the control voltage, the mode of the generator 5 switches from the power generation mode to the stop mode. That is, when the battery voltage becomes equal to or higher than the control voltage, the power generation by the generator 5 stops. When the power generation by the generator 5 is stopped, the generated voltage gradually attenuates according to the time constant of the stator coil 52. As a result, the waveform of the power generation voltage that gradually attenuates after the mode of the generator 5 is switched from the power generation mode to the stop mode is below the threshold voltage Vth2, as shown in FIG.

Therefore, as described above, the measuring unit 764 is configured to measure the time during which the non-crossing state continues and output the power generation command to the field current control unit 74 when the time reaches the threshold time Tth. There is. Further, the measuring unit 764 is configured to output a power generation stop command if the power generation voltage and the threshold voltage Vth2 cross after outputting the power generation command.

In the example shown in FIG. 3, the power generation by the generator 5 is performed in response to the non-intersecting state, that is, the time during which the generated voltage is smaller than the threshold voltage Vth2 has reached the threshold time Tth. While the power is being generated, the power generation by the generator 5 is stopped in response to the power generation voltage crossing the threshold voltage Vth2, that is, the power generation voltage becoming equal to the threshold voltage Vth2. In the floating mode shown in FIG. 3, the state of the generator 5 is switched between a state in which the generator 5 generates power and a state in which the generator 5 stops generating power.

With the configuration of measuring unit 764 described above, control device 7 in the first embodiment can switch the mode of generator 5 from the stop mode to the floating mode.

Next, another example of the operation of the generator 5 controlled by the control device 7 according to the first embodiment will be described with reference to FIG. FIG. 4 is a timing chart showing another example of the waveform of the time change of the generated voltage input to the generator control device 7 according to the first embodiment of the present invention. In addition, in FIG. 4, it is assumed that the above-described leakage current occurs in the generator system 1.

When the battery voltage is lower than the control voltage, the mode of the generator 5 is the power generation mode, as shown in FIG. That is, while the battery voltage is lower than the control voltage, the power generation by the generator 5 is continued.

When the battery voltage becomes equal to or higher than the control voltage, the mode of the generator 5 switches from the power generation mode to the stop mode. That is, when the battery voltage becomes equal to or higher than the control voltage, the power generation by the generator 5 stops. When the power generation by the generator 5 is stopped, the generated voltage gradually attenuates according to the time constant of the stator coil 52.

However, when the ground shift occurs due to the leak current, the waveform of the power generation voltage that gradually attenuates after the mode of the generator 5 is switched from the power generation mode to the stop mode is as shown in FIG. It exceeds the threshold voltage Vth2.

Therefore, as described above, the measuring unit 764 is configured to measure the time during which the non-crossing state continues and output the power generation command to the field current control unit 74 when the time reaches the threshold time Tth. There is. Further, the measuring unit 764 is configured to output a power generation stop command if the power generation voltage and the threshold voltage Vth2 cross after outputting the power generation command.

In the example shown in FIG. 4, the power generation by the generator 5 is performed in response to the non-crossing state, that is, the time during which the generated voltage continues to be larger than the threshold voltage Vth2 reaches the threshold time Tth. While the power is being generated, the power generation by the generator 5 is stopped in response to the power generation voltage crossing the threshold voltage Vth2, that is, the power generation voltage becoming equal to the threshold voltage Vth2. In the floating mode shown in FIG. 4, the state of the power generator 5 is switched between a state in which the power generator 5 generates power and a state in which the power generator 5 stops power generation.

Due to the configuration of the measuring unit 764 described above, unlike the control device 7A in the comparative example, the control device 7 in the first embodiment changes the mode of the generator 5 from the stop mode to the floating mode even when a leak current occurs. You can switch to mode.

Here, in the above-mentioned floating mode, even if the power generation by the generator 5 is stopped, the amplitude of the generated voltage does not immediately become 0, and the transient characteristic of the stator coil 52 causes the amplitude of the generated voltage to gradually decrease. Become. Therefore, in the first embodiment, by utilizing such a phenomenon, the rotation speed measurement unit 75 is configured to measure the engine rotation speed from the waveform of the generated voltage. That is, as described above, the rotation speed measurement unit 75 generates a rectangular wave signal corresponding to the waveform of the generated voltage, and measures the engine rotation speed based on the rectangular wave signal. As a result, even if a leak current occurs, the engine speed can be measured in a situation where power generation is unnecessary.

As described above, according to the first embodiment, the generator control device 7 includes the field current controller 74 that controls the field current flowing in the field coil 51 of the generator 5, the generated voltage, and the threshold voltage Vth2. The non-crossing state duration time in which the non-crossing state in which the non-crossing state continues is measured, the power generation command is output based on the measured non-crossing state duration time, and the power generation command and the threshold voltage Vth2 are output after the power generation command is output. If the two intersect, a floating determination unit 76 that outputs a power generation stop command and a rotation speed measurement unit 75 that measures the engine speed based on the generated voltage are provided. Further, the field current control unit 74 causes the generator 5 to generate power when receiving a power generation command from the floating determination unit 76, and causes the generator 5 to stop power generation when receiving a power generation stop command from the floating determination unit 76. It is configured.

As a result, the engine speed can be measured even when a leak current occurs in the generator system 1. Further, since it is not necessary to apply the configuration of setting the offset voltage for canceling the ground shift in the configuration of the control device 7, it is possible to suppress an increase in the circuit scale. Furthermore, even if a leak current occurs, the engine speed can be measured, and therefore stabilization of the control of the generator 5 can be expected. Furthermore, since it is possible to employ a highly efficient low Vf diode without worrying about the leak current, it is possible to expect an improvement in power generation efficiency.

Each function of the generator control device 7 in the first embodiment described above is realized by a processing circuit. The processing circuit that realizes each function may be dedicated hardware or a processor that executes a program stored in the memory.

When the processing circuit is dedicated hardware, the processing circuit is, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), or an FPGA (Field Programmable Gate Array). , Or a combination of these. The functions of the respective units of the control device 7 may be realized by individual processing circuits, or the functions of the respective units may be collectively realized by the processing circuits.

On the other hand, when the processing circuit is a processor, the function of each unit of the control device 7 is realized by software, firmware, or a combination of software and firmware. Software and firmware are described as programs and stored in memory. The processor realizes the function of each unit by reading and executing the program stored in the memory.

It can be said that the above-described program causes a computer to execute the functions of the above-described units. Here, the memory refers to, for example, a RAM (Random Access Memory), a ROM (Read Only Memory), a flash memory, an EPROM (Erasable Programmable Read Only Memory), or an EEPROM (Electrically erasable memory). Alternatively, a volatile semiconductor memory is applicable. Further, a magnetic disk, a flexible disk, an optical disk, a compact disk, a mini disk, a DVD, etc. also correspond to the memory.

Regarding the functions of the respective units described above, a part may be realized by dedicated hardware and a part may be realized by software or firmware.

In this way, the processing circuit can realize the functions of the above-described units by hardware, software, firmware, or a combination thereof.

1, 1A generator system, 2 battery, 3 vehicle equipment, 4 engine ECU, 5 generator, 6 three-phase AC rectifier, 7,7A generator control device, 51 field coil, 52 stator coil, 71 receiver, 72 voltage generation section, 73 comparison section, 74 field current control section, 75,75A rotation speed measurement section, 76,76A floating determination section, 751 comparison section, 752 measurement section, 753 filter, 754 signal generation circuit, 755 measurement section , 761 comparison unit, 762 measurement unit, 763 comparison unit, 764 measurement unit.

Claims (5)

A field current controller for controlling the field current flowing in the field coil of the generator,
The non-crossing state duration time in which the non-crossing state where the threshold voltage and the generated voltage, which is one-phase AC voltage among the three-phase AC voltage generated by the stator coil of the generator, does not cross, is measured. , Outputting a power generation command based on the measured non-crossing state duration, after outputting the power generation command, if the power generation voltage and the threshold voltage intersect, a floating determination unit that outputs a power generation stop command,
Based on the generated voltage, a rotation speed measurement unit that measures the engine speed,
Equipped with
The field current control unit,
If the power generation command is received from the floating determination unit, the field current is passed through the field coil to cause the generator to generate power, and if the power generation stop command is received from the floating determination unit, the field coil is received. A control device for a generator that causes the generator to stop power generation by interrupting the passage of the field current to the generator. The floating determination unit,
The generator control device according to claim 1, wherein the power generation command is output when the measured non-intersecting state duration reaches a threshold time. The floating determination unit,
The power generation according to claim 1 or 2, wherein a time during which one of the state in which the power generation voltage is higher than the threshold voltage and the state in which the power generation voltage is lower than the threshold voltage continues is measured as the non-crossing state duration time. Machine control equipment. The rotation speed measurement unit,
The generator control device according to claim 1, wherein the engine speed is measured by converting the generated voltage into a rectangular wave signal and measuring a frequency of the rectangular wave signal. The rotation speed measurement unit,
The control device for the generator according to claim 4, wherein noise superimposed on the generated voltage is removed before converting the generated voltage into the rectangular wave signal.

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