JP3869227B2 - Vehicle power generation control device - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a vehicle power generation control device.
[0002]
[Prior art]
JP-A-5-103433, filed by the present applicants, improves the fuel consumption by switching the adjustment voltage at which the battery voltage should converge to a low value when the vehicle is accelerated and a high value when the vehicle is decelerated. It has been proposed to prevent sudden changes in the amount of headlamp light during switching by gradually switching the voltage. Hereinafter, this technology will be referred to as a shift-time adjusting voltage gradual change type vehicle power generation control device or simply a gradual change type power generation control device.
[0003]
[Problems to be solved by the invention]
However, in the above-described gradual change type power generation control device, when the adjustment voltage change rate is reduced in order to reduce the light quantity change rate of the headlamp when the adjustment voltage is switched, the fuel consumption that is the original purpose of the gradual change type power generation control device is reduced. There was a problem that the improvement effect decreased. In addition, the same problem as in the case of the headlamp occurs with respect to the vehicle electrical load whose operation performance varies due to the variation of the applied voltage.
[0004]
The present invention has been made in view of the above problems, and an object of the present invention is to provide a vehicular power generation control device capable of reducing fluctuations in operating performance of an electric load for a vehicle while suppressing a decrease in fuel efficiency improvement effect. It is said.
[0005]
[Means for Solving the Problems]
The power generation control device for a vehicle according to claim 1, wherein a control unit that controls a power generation voltage of a generator that feeds power generated by driving by an engine to an electric load including a headlight of the vehicle and a battery to a predetermined value; A headlight operation detecting means for detecting the operation of the headlight; and a traveling state detecting means for detecting a traveling state of the vehicle, wherein the control unit gradually reduces the generated voltage during vehicle acceleration. In the vehicular power generation control device that commands the gradual increase of the generated voltage during deceleration, the control unit determines the generated voltage when the headlamp is operated and the vehicle is shifted as the generated voltage when the headlamp is not operated and when the vehicle is shifted. Command to change at a lower speed than the voltage , and set the target value of the generated voltage when the headlamp is activated and the vehicle is decelerated to be lower than the target value of the generated voltage when the headlamp is not operated and the vehicle is decelerated It is characterized by.
[0006]
That is, in this configuration, in the gradual change type power generation control device that gradually changes the generated voltage at the time of the vehicle shift described above, the generated voltage gradual change speed at the time of operating the headlamp is slower than that at the time of non-operating of the headlamp. The variation in the amount of headlamp light at the time of vehicle shift can be reduced as compared with the conventional gradual change type power generation control device. Furthermore, since the generation voltage gradual change speed is not reduced when the headlamp is not operated, it is possible to reduce the reduction in fuel efficiency improvement effect.
[0007]
According to a second aspect of the present invention, in the vehicle power generation control device according to the first aspect, the control unit further reduces the power generation voltage when the headlamp is not operated and the vehicle decelerates to a predetermined deceleration higher than the open voltage of the battery. Gradual increase to the value, gradually reducing the generated voltage when the headlamp is not operated and the vehicle is accelerated to a predetermined acceleration value lower than the open voltage, and the generated voltage when the headlamp is operated and the vehicle is decelerated. When the headlamp is not operated and the vehicle is decelerating, the power generation voltage is gradually increased to a predetermined value that is lower than the open-circuit voltage and lower than the open-circuit voltage. Decreasing gradually to a predetermined acceleration value lower than the open circuit voltage at a lower speed than the generated voltage during non-operation and vehicle acceleration, the difference between the predetermined deceleration value and the predetermined acceleration value when the headlamp is activated, The predetermined deceleration value when the headlamp is not operated To set smaller than the difference between the serial acceleration predetermined value commanding respectively.
[0008]
That is, in this configuration, the amount of gradual change in the generated voltage when the headlamp is activated is smaller than that when the headlamp is not activated, so that the fluctuation in the amount of headlamp light during vehicle shift is reduced compared to the conventional gradual change type power generation control device. be able to. Further, since the generated voltage gradual change amount is not reduced when the headlamp is not operated, it is possible to reduce the decrease in the fuel efficiency improvement effect.
[0009]
According to a third aspect of the present invention, in the vehicle power generation control device according to the second aspect, the control unit further sets a difference between the predetermined deceleration value and the predetermined acceleration value when the headlamp is activated to 1 to 2.5V. Therefore, in the vehicle power generation control device using a normal rated 12V battery system, the headlamp light quantity fluctuation suppressing effect and the fuel efficiency improving effect can be realized in a balanced manner.
[0010]
The vehicle power generation control device according to claim 4, wherein a control unit that controls a power generation voltage of a generator that feeds power generated by driving by an engine to an electric load including a headlight of the vehicle and a battery to a predetermined value; A headlight operation detecting means for detecting the operation of the headlight; and a traveling state detecting means for detecting a traveling state of the vehicle, wherein the control unit gradually reduces the generated voltage during vehicle acceleration. In the vehicular power generation control device that commands the gradual increase of the generated voltage at the time of deceleration, the control unit checks whether the power supply voltage is within a predetermined voltage range where visual discomfort due to light amount fluctuation of the headlamp is small, If it is within, the increase rate and decrease rate of the generated voltage are increased, and if it is outside the range, the increase rate and decrease rate of the generated voltage are decreased.
According to a fifth aspect of the present invention, in the vehicle power generation control device according to the fourth aspect, the control unit further reduces the power generation voltage when the headlamp is not operated and the vehicle decelerates to a predetermined deceleration higher than the open voltage of the battery. Gradual increase to the value, gradual decrease of the generated voltage when the headlamp is not operated and the vehicle is accelerated to a predetermined acceleration value lower than the open circuit voltage, and the accelerating speed that changes according to the generated voltage. The power generation voltage at the time of lamp operation and vehicle deceleration is gradually increased to a predetermined deceleration value that is higher than the open circuit voltage, and the power generation at the time of headlight operation and vehicle acceleration at a gradual deceleration that changes according to the power generation voltage. It is characterized by each commanding the voltage to be gradually reduced to a predetermined acceleration value lower than the open circuit voltage.
[0011]
That is, in this configuration, as in the past, when the headlamp is not operated, the generated voltage is gradually changed when the vehicle is shifted, so that it is possible to ensure a fuel efficiency improvement effect. Furthermore , when the headlamp is activated , the gradual change speed of the generated voltage is changed in accordance with the change in the generated voltage when the vehicle is shifted. Preferably, when the generated voltage is large, the gradual change speed is reduced and when the generated voltage is small. Since the gradual change speed is increased, the headlamp light intensity fluctuation is suppressed in the area where the power generation voltage is large due to the large fluctuation of the headlamp light quantity due to the power generation voltage change, and the power generation voltage with small headlamp light quantity fluctuation due to the power generation voltage change is suppressed. The fuel efficiency improvement effect can be ensured even better in a small area.
[0012]
According to a sixth aspect of the present invention, in the vehicle power generation control device according to the fifth aspect, the control unit further sets the power generation voltage when the headlamp is activated and when the vehicle is shifted to when the headlamp is not activated and when the vehicle is shifted. Since it is characterized by instructing to change at a lower speed than the generated voltage, the effect of the first aspect can also be achieved.
[0013]
According to a seventh aspect of the present invention, in the vehicle power generation control device according to any one of the first to sixth aspects, the control unit is configured to generate the power generation when the headlamp is operated and when the vehicle is idling or traveling at a constant speed. Since it is characterized by instructing to fix the voltage to a predetermined constant value, wasteful control during idling or constant speed traveling can be reduced .
[0014]
DETAILED DESCRIPTION OF THE INVENTION
A preferred embodiment of the vehicle power generation control device of the present invention will be described with reference to the following examples.
[0015]
[Example 1]
FIG. 1 shows a vehicular power generation apparatus to which the vehicular power generation control apparatus of the first embodiment is applied.
[0016]
The vehicular generator 4 is driven by an engine (not shown) and supplies power to the headlamp 8 and other electric loads 5 and the battery 6 constituting an electric load.
[0017]
The microcomputer 1 that constitutes a control unit according to the present invention includes a current sensor 2 that detects the current and voltage of the battery 6, a generator data from a voltage sensor (for example, a resistance voltage dividing circuit) 3, an engine control computer (in the present invention). The vehicle traveling data indicating the traveling state of the vehicle such as the vehicle speed, the engine speed, and the throttle opening from the traveling state detecting means) 10 is received, and the generated voltage of the generator 4 is controlled according to the received data. This power generation voltage control is normally performed by controlling the field current of the generator 4. For example, as is well known, the duty ratio of the field current interrupting transistor is changed based on a comparison result between a predetermined adjustment voltage and the battery voltage. It is done by doing.
[0018]
Further, the microcomputer 1 receives headlight operation data through a switch 7 and a resistor 9 which constitute the headlight operation detection means referred to in the present invention. When the switch 7 is off, the power supply from the battery 6 to the headlamp 8 is cut off, the headlamp 8 is deactivated, a high voltage is applied from the battery 6 through the resistor 9, and the microcomputer 1 The non-operation of the headlamp 8 is detected. When the switch 7 is on, power is supplied from the battery 6 to the headlamp 8 so that the headlamp 8 is in an operating state. At the same time, the output terminal of the resistor 9 is grounded. When applied, the microcomputer 1 detects the operation of the headlamp 8.
[0019]
(Generation voltage control)
If the power generation voltage is changed when the headlight lighting switch 7 is closed, that is, when the headlight 8 is operated, the driver feels uncomfortable due to fluctuations in the light quantity of the headlight. Therefore, in this embodiment, the adjustment voltage of the microcomputer 1 is changed in accordance with the operating state of the headlight 8 and the vehicle speed (particularly speed change) state. Since the microcomputer 1 changes the intermittent duty ratio of the built-in transistor for interrupting the field current of the generator 4 based on the comparison result between the generated voltage and the adjusted voltage, the field current of the generator 4 is changed and the field current is changed. The generated voltage of the generator 4 is changed approximately in proportion to the flow rate.
[0020]
(Generation voltage change control)
The power generation voltage change control of the microcomputer 1 will be described below with reference to the flowcharts shown in FIGS. 100 to 128 are step numbers.
[0021]
Control is started as the engine is started, and initial values are substituted for each variable at an initial setting of 100, and routines 101 to 128 are executed at a cycle of 0.1 sec.
[0022]
At 101, signals of vehicle speed, engine speed, and throttle opening are taken from the engine control computer, and at 102, the running condition is determined.
[0023]
FIG. 4 shows a subroutine for determining the running state 102. 200 to 208 are step numbers.
[0024]
If the engine speed is 0 at 200, it is determined that the engine is stopped. If the engine speed is not 0, the determination after 201 is performed. If the vehicle speed is 201 at 201, it is determined to be idle, and if the vehicle speed is not 0 and the throttle opening is 0 at 202, it is determined to be deceleration. If the throttle opening is not 0 at 202 and the vehicle speed is increased at 204, it is determined to be acceleration, and if the vehicle speed is not increased at 204, it is determined to be a constant speed. However, the flowchart shown in FIG. 4 shows an example of the traveling state determination, and other traveling state determination operations may be adopted.
[0025]
Next, it is determined at 103 whether or not the headlight is operating. If it is operating, the process proceeds to 116, and if it is not operating, the process proceeds to 104.
[0026]
If it is determined that the vehicle is decelerating at 104 when it is not in operation, the target value (adjusted voltage, target voltage) of the generated voltage is higher than the open voltage of the battery 6 so that the battery 6 charges the generated power at 105 (15 .0V).
[0027]
If it is determined in the next 106 that acceleration is performed, the power generation voltage target value is set to a value (12.0 V) lower than the open circuit voltage of the battery so as to suppress power generation and supply power from the battery 6 in 107.
[0028]
If it is determined at the next 108 that the speed is constant, the target value of the generated voltage is set to a voltage value at which the SOC (charged state) of the battery can be maintained at 109.
[0029]
A subroutine for the SOC maintenance control at 109 is shown in FIG. 400 to 404 are step numbers.
[0030]
At 400, it is determined whether the SOC is greater than 90%. When the SOC is greater than 90% at 401, the battery 6 has a sufficient remaining capacity, and the target value of the generated voltage is set so that the battery 6 is discharged. Is set to a value (12 V) lower than the electromotive voltage. If the SOC is 90% or less at 400, it is determined whether the SOC is less than 85% at 402. If the SOC is less than 85%, the target value of the generated voltage is higher than the open voltage of the battery 6 at 403. The battery 6 is charged by setting to (15V). If the SOC is 85 to 90%, the target value of the generated voltage is set to a value (12.8 V) substantially equal to the open circuit voltage of the battery 6 at 404.
[0031]
If it is determined at 110 that the engine is in the idle state, the target value of the generated voltage is set at 111 at a voltage value that can maintain the above-described battery SOC (charged state). Next, at 112, it is determined whether or not the difference between the target power generation voltage value and the current power generation voltage value is greater than 0.2V. The value is added. That is, the amount of increase from the current power generation voltage value is limited to 0.2V. Here, 0.2 V corresponds to a voltage increase rate (power generation voltage gradual increase rate) of 2 V / sec because this process is a cycle of 0.1 sec.
[0032]
Similarly, it is determined at 114 whether or not the difference between the generated power voltage target value and the current generated voltage value is smaller than −0.2 V. If the difference is smaller, the generated power voltage target value is set to 0.1 from the current generated voltage value at 115. The value obtained by subtracting 2V. That is, the amount of decrease from the current generated voltage value is limited to 0.2V. This corresponds to a voltage decrease rate (power generation voltage gradual decrease rate) of 2 V / sec as described above.
[0033]
Further, when the headlight is operating at 103, different operations are performed in accordance with the driving conditions by 116 to 123 as described above. The headlight 8 is different from the non-operating state in that the target value of the generated voltage is set to 14.0 V at 117 during deceleration. Thereby, the change width of the generated voltage is limited to 3 V (12 to 15 V) to 2 V (12 to 14 V).
[0034]
In the next 124 to 127, the headlight 8 is different from the non-operating state in that the increase amount and the decrease amount from the current power generation voltage value are limited to 0.05V. The generation voltage gradual increase rate and the decrease rate (generation voltage gradual decrease rate) are limited to 0.5 V / sec.
[0035]
At the next 128, the target value of the generated voltage is substituted into the actual generated voltage value (the generated voltage is controlled using the adjustment voltage), and the process returns to 101.
[0036]
[Example 2]
In the first embodiment described above, it is possible to prevent the uncomfortable feeling of blinking of the headlight due to the change in the generated voltage by reducing the change width and change rate of the generated voltage during the headlight operation. In addition, since it is considered that there is little change in the driver's field of view at the time of idling or constant speed, it is possible to suppress the uncomfortable feeling of flickering of the headlights by maintaining the generated voltage at a constant value.
[0037]
The generated voltage change control of the microcomputer 1 that performs this control will be described below with reference to the flowchart shown in FIG. The flowcharts shown in FIGS. 5 and 6 execute steps 121a and 123a instead of steps 121 and 123 in the flowcharts of the first embodiment shown in FIGS.
[0038]
When it is determined that the vehicle travels at a constant speed at 120, and when it is determined that the vehicle is idling at 122, the target value of the generated voltage is fixed at 13.8V at steps 121a and 123a.
[0039]
As a result, the generated voltage can be controlled to a constant value during idling or constant speed with little change in the driver's field of view.
[0040]
[Example 3]
In the above-described second embodiment, the headlight caused by the change in the generated voltage is reduced by reducing the change width and change speed of the generated voltage during the headlight operation and fixing the generated voltage to a constant value during idling and constant speed running. The discomfort of flickering was prevented. However, reducing the change width and change speed of the generated voltage causes a problem that the fuel efficiency improvement effect is reduced. Therefore, in this embodiment, by utilizing the fact that the uncomfortable feeling of the headlight light amount fluctuation caused by the change in the generated voltage varies depending on the magnitude of the generated voltage, the generated voltage gradually changing speed is slowed down in a region where the uncomfortable feeling is large, and the uncomfortable feeling is felt. In a small region, the reduction in fuel consumption improvement effect is suppressed by increasing the power generation voltage gradual change rate.
[0041]
The generated voltage change control of the microcomputer 1 that performs this control will be described below with reference to the flowcharts shown in FIGS. The flowcharts shown in FIGS. 8 and 9 are obtained by changing steps 124 to 127 in the flowchart of the second embodiment shown in FIG. 4 to steps 524 to 530.
[0042]
In 524, it is checked whether the generated voltage value (also simply referred to as the generated voltage in this specification) is within the range of 12.8 to 13.5V. The increase / decrease width is set to 0.2V (525), and if it is out of the range, the visual increase / decrease width due to fluctuations in the light quantity of the headlight is large, so the voltage increase / decrease width is set to 0.05V (526). That is, in the region where the uncomfortable feeling of the headlight is small, the increase rate and the decrease rate of the generated voltage are set to 2 V / sec, and in the region where the uncomfortable feeling is large, the increase rate and the decrease rate of the generated voltage are regulated to 0.5 V / sec.
[0043]
That is, in the next step 527, it is determined whether or not the difference between the generated voltage target value and the generated voltage value exceeds the voltage increase / decrease range set above, and if it exceeds, the generated voltage target value is set to the generated voltage value + voltage increase / decrease range. To saturate (528). Next, in 529, it is determined whether or not the difference between the generated voltage target value and the generated voltage value is smaller than the negative value of the voltage increase / decrease width set above. Saturate to increase / decrease voltage.
[0044]
As a result, the generation voltage gradual change speed is slowed down in areas where the uncomfortable feeling of headlight light intensity fluctuations caused by changes in the generated voltage is large, and the generation voltage gradual change speed is increased in areas where there is little discomfort. However, it is possible to suppress a decrease in fuel efficiency improvement effect.
[0045]
(Modification)
In each of the above-described embodiments, the headlamp light quantity fluctuation due to the power supply voltage fluctuation was reduced while suppressing the decrease in the fuel efficiency improvement effect, but instead of the headlamp, the on-board fan such as a blower or a wiper caused a fluctuation in the power supply voltage. By using the control described in the above-described embodiment for the electric load for a vehicle whose operating performance fluctuates, it is possible to realize an improvement in fuel consumption while suppressing an increase in defects due to a change in the operating performance of these electric loads for the vehicle.
[Brief description of the drawings]
FIG. 1 is a circuit diagram showing a vehicular power generation apparatus to which a vehicular power generation control apparatus of the present invention is applied.
FIG. 2 is a flowchart illustrating a control operation of the vehicle power generation control device according to the first embodiment.
FIG. 3 is a flowchart illustrating a control operation of the vehicle power generation control device according to the first embodiment.
FIG. 4 is a flowchart showing a traveling state determination operation of the vehicle power generation control device according to the first embodiment.
FIG. 5 is a flowchart illustrating a control operation of the vehicle power generation control device according to the second embodiment.
FIG. 6 is a flowchart showing a control operation of the vehicle power generation control device according to the second embodiment.
FIG. 7 is a flowchart showing an SOC control operation.
FIG. 8 is a flowchart illustrating a control operation according to the third embodiment.
FIG. 9 is a flowchart illustrating a control operation according to the third embodiment.
[Explanation of symbols]
1 Microcomputer (control unit)
7 switch (headlamp operation detection means)
9 Resistor (headlamp operation detection means)

Claims (7)

A control unit for controlling the generated voltage of the generator that feeds power generated by driving the engine to the electric load including the vehicle headlamp and the battery to a predetermined generated voltage target value;
Headlamp operation detecting means for detecting the operation of the headlamp;
Traveling state detecting means for detecting the traveling state of the vehicle;
With
In the vehicle power generation control device that commands the gradual decrease of the generated voltage during vehicle acceleration and the gradual increase of the generated voltage during vehicle deceleration,
The controller is
Commands the headlamp to change the generated voltage at the time of shifting the vehicle at a lower speed than the generated voltage at the time of headlamp not operating and at the time of shifting the vehicle. The power generation control device for a vehicle , wherein the power generation voltage target value is set lower than the power generation voltage target value when the headlamp is not operated and the vehicle is decelerated . The vehicle power generation control device according to claim 1,
The controller is
Gradually increasing the generated voltage at the time of headlight non-operation and vehicle deceleration to a predetermined deceleration value higher than the open circuit voltage of the battery;
Gradually reducing the generated voltage when the headlamp is not operated and the vehicle is accelerated to a predetermined acceleration value lower than the open voltage;
Gradually increasing the generated voltage when the headlamp is activated and the vehicle is decelerated to a predetermined deceleration value that is lower than the generated voltage when the headlamp is not activated and the vehicle is decelerated and higher than the open voltage;
Gradually reducing the generated voltage during headlight operation and vehicle acceleration to a predetermined acceleration value lower than the open voltage at a lower speed than the generated voltage during headlight non-operation and vehicle acceleration;
Setting the difference between the predetermined deceleration value and the predetermined acceleration value when the headlamp is operated to be smaller than the difference between the predetermined deceleration value and the predetermined acceleration value when the headlamp is not operated;
Each of which is commanded. The vehicle power generation control device according to claim 2,
The controller is
The vehicle power generation control device, wherein a difference between the predetermined deceleration value and the predetermined acceleration value when the headlamp is operated is set to 1 to 2.5V. A control unit for controlling the generated voltage of a generator that feeds power generated by driving the engine to an electric load including a vehicle headlamp and a battery to a predetermined value;
Headlamp operation detecting means for detecting the operation of the headlamp;
Traveling state detecting means for detecting the traveling state of the vehicle;
With
In the vehicle power generation control device that commands the gradual decrease of the generated voltage during vehicle acceleration and the gradual increase of the generated voltage during vehicle deceleration,
The controller is
It is checked whether the power supply voltage is within a predetermined voltage range in which visual discomfort due to fluctuations in the amount of light of the headlamp is small. If it is within the range, the increase rate and decrease rate of the generation voltage are increased. Power generation control device for reducing the increase speed and decrease speed of the vehicle.   The vehicle power generation control device according to claim 4,
  The controller is
  Gradually increasing the generated voltage when the headlamp is not operated and the vehicle is decelerated to a predetermined deceleration value that is higher than the open-circuit voltage of the battery;
  Gradually reducing the generated voltage when the headlamp is not operated and accelerating the vehicle to a predetermined acceleration value lower than the open voltage;
  Gradually increasing the power generation voltage at the time of headlamp operation and vehicle deceleration at a gradually increasing speed that changes according to the power generation voltage to a predetermined deceleration value that is higher than the open-circuit voltage;
  Gradually reducing the generated voltage at the time of headlight operation and vehicle acceleration at a gradually decreasing speed that changes according to the generated voltage to a predetermined acceleration value lower than the open voltage;
  Each of which is commanded. The vehicle power generation control device according to claim 5 ,
The controller is
A power generation control device for a vehicle characterized by instructing to change the power generation voltage at the time of headlamp operation and vehicle shift at a lower speed than the power generation voltage at the time of headlight non-operation and vehicle shift. The vehicle power generation control device according to any one of claims 1 to 6 ,
The controller is
A power generation control device that commands to fix the power generation voltage to a predetermined constant value when the headlamp is operated and when the vehicle is idling or traveling at a constant speed.

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