JP4209894B2 - Power generation control device for vehicle generator - Google Patents

Description

  The present invention relates to a vehicle generator mounted on a vehicle and driven by an internal combustion engine, and more particularly to a power generation control device thereof.

  Patent Document 1 discloses a conventional control device for a vehicle charging generator. This device includes a voltage control circuit and a current control circuit that feed back a generated voltage and a field current and output a control signal, and a pulse width modulation control device that changes a field current according to a control signal from both circuits. In order to control the generated voltage, a switching means for independently operating the voltage control circuit and the current control circuit is provided to improve control accuracy at a low cost.

Japanese Patent No. 3329402

In the conventional control device for a charging generator for a vehicle, there is no disclosure about a problem of stably operating the control device with respect to a temperature change of the generator for a vehicle. However, in use of a vehicular generator, the temperature varies widely from below freezing to about 100 ° C. For this reason, the generated power characteristics change depending on the temperature, and there is a problem that the power generation control device of the vehicular generator lacks stability.
The present invention has been made to solve the above-described problems, and is capable of operating more stably by taking into consideration the generated power characteristics that change depending on the temperature with respect to the temperature change of the vehicular generator. An object of the present invention is to obtain a power generation control device for a vehicular generator capable of performing

A power generation control device for a vehicular generator according to the present invention includes a rectifier that converts AC power generated by a winding field type synchronous rotating machine into DC power and supplies it to an electric load and a battery, and a temperature of the synchronous rotating machine. Temperature detecting means for detecting, field switching element for switching ON / OFF of voltage application to the field winding of the synchronous rotating machine, and voltage for detecting the voltage of the battery or the DC side voltage of the rectifier Calculation based on the voltage deviation between the voltage detected by the voltage detection means and the set power generation target voltage so that the voltage detected by the detection means and the voltage detection means matches the set power generation target voltage the has been oN / OFF ratio of the magnetic field switching devices, so as to compensate for the generated power characteristics that change with temperature, based on the detected temperature of the above synchronous rotating machine by the temperature detecting means complement A control duty calculation means for, and in accordance with the ON / OFF ratio calculated by the control duty calculating means, and a field PWM drive means for generating a field switching signal for driving the magnetic field switching devices, the The field switching element is driven by the field switching signal output of the field PWM drive means.

In addition, a power generation control device for a vehicular generator according to the present invention includes a rectifier that converts AC power generated by a winding field type synchronous rotating machine into DC power and supplies it to an electric load and a battery; Rotational speed detecting means for detecting rotational speed, temperature detecting means for detecting the temperature of the synchronous rotating machine, and field switching for switching ON / OFF of voltage application to the field winding of the synchronous rotating machine A voltage detecting means for detecting an element, a voltage of the battery or a DC side voltage of the rectifier, and a voltage detected by the voltage detecting means so as to match a voltage detected by the voltage detecting means with a set power generation target voltage; It has been the oN / OFF ratio of the magnetic field switching element that is calculated based on the voltage deviation between the voltage and the set target generated power voltage, to compensate for the generated power characteristics that change by the rotational speed and temperature As a control duty calculation means for correcting, based on the detected temperature of the above synchronous rotating machine with the detected engine speed and the temperature detecting means by the rotational speed detection means, and calculated in the control duty calculation means Field PWM drive means for generating a field switching signal for driving the field switching element in accordance with the ON / OFF ratio, and the field switching element by the field switching signal output of the field PWM drive means Is to be driven.

According to the power generation control device for a vehicle generator of the present invention, the voltage detected by the voltage detection means and the power generation target set so as to match the voltage detected by the voltage detection means with the set power generation target voltage. The ON / OFF ratio of the field switching element calculated based on the voltage deviation from the voltage is based on the temperature of the synchronous rotating machine detected by the temperature detecting means so as to compensate the generated power characteristic that varies with temperature. Since the field switching element is driven in accordance with the corrected ON / OFF ratio, the vehicle power generator is considered by taking into consideration the generated power characteristics that change depending on the temperature with respect to the temperature change of the vehicle generator. The power generation control device of the generator can be operated more stably.

Further, according to the power generation control device for a vehicular generator of the present invention, the voltage detected by the voltage detecting means is set to match the voltage detected by the voltage detecting means with the set power generation target voltage. The rotational speed detected by the rotational speed detection means so that the ON / OFF ratio of the field switching element calculated based on the voltage deviation from the power generation target voltage is compensated for the generated power characteristic that varies depending on the rotational speed and temperature. Since the field switching element is driven in accordance with the corrected ON / OFF ratio based on the temperature of the synchronous rotating machine detected by the temperature detecting means, the rotational speed and temperature change of the vehicle generator On the other hand, the power generation control device of the vehicular generator can be operated more stably by taking into consideration the generated power characteristics that change depending on the rotation speed and temperature.

Embodiment 1 FIG.
1 is a block diagram showing the overall configuration of a power generation control device for a vehicle generator according to Embodiment 1 of the present invention. In the figure, a power generation control device for a vehicle generator includes a wound field type synchronous rotating machine 1, a rectifier 2, a battery 3, a switch 4, an electric load 5, a power generation control device 6, a field switching element 7, and a flywheel diode. 8 is mainly composed. A wound field type synchronous rotating machine 1 (hereinafter also simply referred to as a synchronous rotating machine) includes an armature winding 15, a field winding 16, and the like. The rotating portion of the synchronous rotating machine 1 is interposed via a belt or the like. And indirectly or directly to a power source such as an internal combustion engine (not shown). An AC voltage is induced in the armature winding 15 by the rotation of the rotating portion, and is converted into a DC voltage by the rectifier 2. .

  An electric load 5 is connected to the rectifier 2 via a battery 3 and a switch 4, and DC power is supplied to these. P and N are DC side terminals of the rectifier 2. At this time, the magnitude of the DC voltage converted by the rectifier 2 varies depending on the balance between the generated power of the synchronous rotating machine 1 and the power consumption of the battery 3 and the electric load 5. The electric load 5 includes a headlamp, a blower, a wiper, a radio, various electric devices, and electronic devices. Depending on the characteristics of the electric load 5, fluctuations in the DC voltage have an undesirable effect. For example, in a headlamp, it becomes a factor of change in brightness and flicker. For this reason, the power generation control device 6 acts to balance the generated power against the power consumption so as to operate at a predetermined DC voltage. This is done by adjusting the AC voltage induced in the armature winding 15 by manipulating the amount of field current flowing through the field winding 16.

  The power generation control device 6 in FIG. 1 will be described in detail. The power generation control device 6 includes voltage detection means 9, rotation speed detection means 10, temperature detection means 11, control duty calculation means 12, and field PWM drive means 14 (PWM: PulseWidth Modulation). First, the voltage detection means 9 detects voltage information of the battery 3 (or the DC side voltage of the organizer 2). Next, in the rotation speed detection means 10, the voltage between the anode (A) and the cathode (K) of the rectifier diode in the rectifier 2 is input, and the rotation speed information of the synchronous rotating machine 1 is calculated.

  In the rectification operation of the rectifier 2, the rectifier diode constituting the rectifier 2 is switched between a conductive state and a non-conductive state in synchronization with the AC voltage induced in the armature winding 15. Further, a current flows in synchronization with this state change. The potential difference between the anode (A) and the cathode (K) is a small value corresponding to a voltage drop at the time of forward operation of the semiconductor PN junction in the conductive state, and is large in the non-conductive state. Therefore, for example, the rotation speed can be calculated by measuring the period of a signal that changes in synchronization with the rotation, such as between rising edges of the potential difference waveform between the anode (A) and the cathode (K). Further, the rotational speed detecting means 10 may calculate from rotational position information of sensors such as a resolver, an encoder, and a Hall element attached to the synchronous rotating machine 1.

  Next, the temperature detecting means 11 can detect temperature information by attaching an element whose resistance changes due to a temperature change, such as a thermistor or a thermocouple, to the synchronous rotating machine 1 and detecting the resistance value change as a voltage value change. it can. Further, the temperature detecting means 11 estimates the temperature information of the synchronous rotating machine 1 from the temperature of the rectifier 2 without attaching the above elements to the synchronous rotating machine 1 and various information of the vehicle to which the synchronous rotating machine 1 is attached. It may be detected.

  The voltage information, rotation speed information, and temperature information detected as described above are input to the control duty calculation unit 12. The control duty calculation means 12 compares the power generation target voltage set in advance with the voltage information of the battery 3 and compares them, and according to the deviation, the rotational speed information, and the temperature information, the ON / OFF ratio ( (Duty) is calculated and output. Subsequently, the ON / OFF ratio of the field switching element 7 is input to the field PWM drive means 14. The field PWM drive means 14 calculates the ON timing and OFF timing of the field switching element 7 based on the ON / OFF ratio when the field switching element 7 is turned ON / OFF, and drives the field switching element 7. The field switching signal is generated.

  Next, the field switching element 7 performs an ON / OFF operation by a field switching signal transmitted from the field PWM drive means 14. The low potential side of the field switching element 7 is connected to the N (low) side of the rectifier 2, and the high potential side is connected to one end of the field winding 16 and the anode (A) of the flywheel diode 8. . The other end point of the field winding 16 is connected to the P (higher) side of the rectifier 2 together with the cathode (K) of the flywheel diode 8, and the field switching element 7 is switched on and off to switch the field magnet. Since the voltage applied to both ends of the winding 16 changes, the field current amount can be adjusted.

  As described above, according to the power generation control device for the vehicular generator according to the first embodiment, from the deviation information between the battery voltage and the power generation target voltage under the aspect of detecting the temperature of the synchronous rotating machine 1, Reflecting the generated power characteristics that change depending on the temperature of the synchronous rotating machine, the appropriate field switching element ON / OFF ratio is calculated, and the amount of voltage applied to the field winding is controlled by this ratio to control the field current. By adjusting, the battery voltage can be operated so as to coincide with the power generation target voltage with a favorable response characteristic with respect to the generated power characteristic that varies depending on the rotation speed and temperature.

  First, FIG. 2 illustrates a case where only the voltage deviation 121 is input to the control duty calculation means 112 to derive the control duty 122. FIG. 2 is a configuration diagram showing a basic configuration of the control duty calculation means in the first embodiment. In the control duty calculation means 112 of FIG. 2, by determining the voltage deviation axis of the control duty map based on the input voltage deviation and deriving the control duty (%) corresponding to the determined voltage deviation axis, The control duty can be derived only by adding or subtracting the voltage deviation from the reference position of the map storing the control duty without performing a complicated calculation.

  Next, the control duty calculation means 212 actually configured in FIG. 3 will be described. FIG. 3 is a configuration diagram showing an actual configuration of the control duty calculation means in the first embodiment. The control duty calculation means 212 is composed of a plurality of maps corresponding to the rotational speed in order to switch the control duty map around the voltage deviation according to the rotational speed detected by the rotational speed detection means 10. Multiple maps are provided for the assumed speed. In addition, in order to switch a plurality of maps according to the rotation speed according to the temperature detected or estimated by the temperature detecting means 11, the map includes a plurality of maps according to the plurality of rotation speeds according to the temperature. A plurality of maps are provided for assumed temperatures.

  The control duty calculation means 212 first determines a plurality of maps according to the rotation speed based on the input temperature 221, and then generates a control duty map from the plurality of maps according to the rotation speed based on the input rotation speed 222. Further, the control duty 224 is derived based on the input voltage deviation 223. When at least one of the input temperature, rotation speed, and voltage deviation does not match the map axis data, the control duty map interpolation calculation (for example, proportional proration) is performed to estimate the control duty, thereby calculating the number of maps. Can be configured less.

  In the embodiment shown in FIG. 3, the rotational speed detected by the rotational speed detection means and the synchronous rotation detected by the temperature detection means so that the voltage detected by the voltage detection means matches the set power generation target voltage. The ON / OFF ratio of the field switching element is calculated based on the temperature of the machine, and the field switching element is driven according to the calculated ON / OFF ratio. Based on the temperature of the synchronous rotating machine detected by the temperature detecting means so as to match the set power generation target voltage, the ON / OFF ratio of the field switching element is calculated, and according to the calculated ON / OFF ratio, The field switching element may be driven.

  When there is no change in control duty due to change in temperature or rotation speed, the same value is set for the map sequence created for each temperature or rotation speed and the control duty stored in the map. Alternatively, this can be dealt with by changing the map configuration to voltage deviation and temperature, or voltage deviation and rotation speed.

FIG. 4 is a configuration diagram showing a basic configuration of the control duty map in the first embodiment. If the configuration diagram is represented by a characteristic curve of the control duty (%) with respect to the voltage deviation (V), the characteristic diagram on the right side is obtained. The step width of the voltage deviation and the control duty is constant.
FIG. 5 is a configuration diagram showing the configuration of the control duty that changes due to a temperature change under a constant rotational speed. When the temperature changes under a constant rotational speed, the characteristic curve of the control duty (%) with respect to the voltage deviation (V) moves in parallel to the right as the temperature rises. That is, when the temperature rises for the same voltage deviation, the control duty (%) increases.
FIG. 6 is a configuration diagram showing the configuration of the control duty that changes due to a change in the rotational speed under a constant temperature. When the rotational speed changes under a constant temperature, the characteristic curve of the control duty (%) with respect to the voltage deviation (V) moves in parallel to the left when the rotational speed increases and the temperature is constant. That is, when the rotational speed increases for the same voltage deviation, the control duty (%) decreases.

Embodiment 2. FIG.
FIG. 7 is a configuration diagram showing the configuration of a control duty map in which the voltage deviation axis increments are made finer in the second embodiment. If the configuration diagram is represented by a characteristic curve of the control duty (%) with respect to the voltage deviation (V), the characteristic diagram on the right side is obtained. In FIG. 7, as the absolute value of the voltage deviation decreases, the change in the control duty that is output when the battery voltage is close to the power generation target voltage is obtained by making the step of the voltage deviation axis referring to the control duty map finer. By making it finer, the steady-state error between the battery voltage and the power generation target voltage can be reduced.

Embodiment 3 FIG.
FIG. 8 is a configuration diagram showing the configuration of a control duty map in which the rate of change in the control duty is reduced as the voltage deviation in the third embodiment is reduced. If the configuration diagram is represented by a characteristic curve of the control duty (%) with respect to the voltage deviation (V), the characteristic diagram on the right side is obtained. The smaller the voltage deviation, the smaller the rate of change of the control duty, so that when the battery voltage is near the power generation target voltage, the fluctuation of the control duty is small, and when the battery voltage moves away from the power generation target voltage, the power generation target voltage is immediately Therefore, when the battery voltage is near the power generation target voltage, the fluctuation of the power generation voltage is reduced, and when the battery voltage is far from the power generation target voltage, the fluctuation of the power generation voltage is increased. And can quickly match the power generation target voltage.

  In addition, the electric power generation control apparatus 6 of FIG. 1 can comprise a part or all of a circuit with a digital circuit or a microcomputer.

It is a block diagram which shows the whole structure of the electric power generation control apparatus of the generator for vehicles in Embodiment 1 of this invention. FIG. 3 is a configuration diagram illustrating a basic configuration of a control duty calculation unit in the first embodiment. FIG. 3 is a configuration diagram illustrating an actual configuration of a control duty calculation unit in the first embodiment. FIG. 3 is a configuration diagram showing a basic configuration of a control duty map in the first embodiment. FIG. 3 is a configuration diagram showing a configuration of a control duty that changes due to a temperature change under a constant rotation speed in the first embodiment. FIG. 3 is a configuration diagram showing a configuration of a control duty that changes due to a change in rotational speed under a constant temperature in the first embodiment. FIG. 10 is a configuration diagram showing a configuration of a control duty map in which voltage deviation axis increments in the second embodiment are made fine. FIG. 10 is a configuration diagram showing the configuration of a control duty map in which the rate of change in control duty is reduced as the voltage deviation in the third embodiment is reduced.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Winding field type synchronous rotating machine 2 Rectifier 3 Battery 4 Switch 5 Electric load 6 Electric power generation control device 7 Field switching element 8 Flywheel diode 9 Voltage detection means 10 Rotational speed detection means 11 Temperature detection means 12 Control duty calculation means 14 Field PWM drive means 15 Armature winding 16 Field winding 112 Control duty calculation means 121 Voltage deviation 122 Control duty 212 Control duty calculation means 221 Temperature 222 Rotational speed 223 Voltage deviation 224 Control duty

Claims (5)

A rectifier that converts the AC power generated by the wound field type synchronous rotating machine into DC power and supplies it to the electric load and the battery;
Temperature detecting means for detecting the temperature of the synchronous rotating machine;
A field switching element that is driven to switch ON / OFF of voltage application to the field winding of the synchronous rotating machine;
Voltage detection means for detecting the voltage of the battery or the DC side voltage of the rectifier, and the voltage detected by the voltage detection means so as to match the voltage detected by the voltage detection means with a set power generation target voltage The ON / OFF ratio of the field switching element calculated based on the voltage deviation from the set power generation target voltage is detected by the temperature detection means so as to compensate the generated power characteristics that vary with temperature. Control duty calculation means for correcting based on the temperature of the synchronous rotating machine, and a field switching signal for driving the field switching element according to the ON / OFF ratio calculated by the control duty calculation means Field PWM drive means,
A power generation control device for a vehicle generator, wherein the field switching element is driven by a field switching signal output of the field PWM drive means. A rectifier that converts the AC power generated by the wound field type synchronous rotating machine into DC power and supplies it to the electric load and the battery;
A rotational speed detecting means for detecting the rotational speed of the synchronous rotating machine;
Temperature detecting means for detecting the temperature of the synchronous rotating machine;
A field switching element that is driven to switch ON / OFF of voltage application to the field winding of the synchronous rotating machine;
Voltage detection means for detecting the voltage of the battery or the DC side voltage of the rectifier, and the voltage detected by the voltage detection means so as to match the voltage detected by the voltage detection means with a set power generation target voltage The rotational speed detecting means so as to compensate the ON / OFF ratio of the field switching element calculated on the basis of the voltage deviation from the set power generation target voltage so as to compensate the generated power characteristic that varies depending on the rotational speed and temperature. According to the control duty calculation means for correcting based on the rotational speed detected in step (b) and the temperature of the synchronous rotating machine detected by the temperature detection means, and the ON / OFF ratio calculated by the control duty calculation means. Field PWM drive means for generating a field switching signal for driving the magnetic switching element,
A power generation control device for a vehicle generator, wherein the field switching element is driven by a field switching signal output of the field PWM drive means.   A control duty that derives the control duty based on the voltage deviation from the map storing the control duty based on the voltage deviation between the voltage detected by the voltage detection means and the set power generation target voltage and sets the ON / OFF ratio. The power generation control device for a vehicular generator according to claim 1 or 2, further comprising a calculating means.   4. The vehicle control vehicle according to claim 3, wherein the control duty calculation means includes the control duty map in which the increment of the voltage deviation referring to the control duty becomes finer as the absolute value of the voltage deviation becomes smaller. Generator control device for generator.   4. The power generation control device for a vehicular generator according to claim 3, wherein the control duty calculation means includes the control duty map in which a change rate of the control duty is reduced as the voltage deviation is reduced.

Images