JP5578007B2 - Vehicle optical sensor communication system - Google Patents

Description

  The present invention includes an optical sensor, a light control unit that controls lighting and extinguishing of a vehicle light based on a measurement result of the optical sensor, and an air conditioner control unit that controls air conditioning in the vehicle based on the measurement result of the optical sensor. The present invention relates to a communication system for a vehicle optical sensor that performs communication between the two.

  Conventionally, an optical sensor that measures the illuminance outside the vehicle and the amount of left and right solar radiation inserted into the vehicle, and a light control unit that controls the turning on and off of the vehicle light based on the illuminance measured by the optical sensor, A vehicle optical sensor communication system is known that includes an air conditioner control unit that controls air conditioning in a vehicle based on the amount of left and right solar radiation measured by the optical sensor (see, for example, Patent Document 1).

  Specifically, in such a vehicle optical sensor communication system, the optical sensor indicates the illuminance among the detection unit that measures the illuminance, the left solar radiation amount, and the right solar radiation amount, and the measurement result measured by the detection unit. A frequency conversion circuit that outputs a pulse signal based on the current value; and a current amplifying unit that amplifies and outputs a current value indicating the left solar radiation amount and the right solar radiation amount among the measurement results. The detection unit and the light control unit are connected with a communication line such as a wire harness via a frequency conversion circuit, and the detection unit and the air conditioner control unit are connected with a communication line such as a wire harness via a current amplification circuit. Connected through. The light control unit and the air conditioner control unit are connected via a communication line such as a LAN cable.

  In the vehicle optical sensor communication system, the optical sensor converts the measured illuminance current value into a pulse signal by the frequency conversion circuit and outputs the pulse signal to the light control unit. The light control unit calculates the illuminance from the input pulse signal. Judgment is performed to control turning on and off of the vehicle light. In addition, the optical sensor amplifies the measured current values of the left and right solar radiation amounts by the current amplification unit and outputs them to the air conditioner control unit. The air conditioner control unit determines the input current value and determines the air conditioning in the vehicle. Is controlling.

Japanese Patent Laid-Open No. 06-344754

  However, in the above-described vehicle optical sensor communication system, the optical sensor converts the illuminance of the measurement result into a pulse signal by the frequency conversion circuit and outputs the pulse signal, and also amplifies the left solar radiation amount and the right solar radiation amount of the measurement result by current amplification. The output is amplified by the unit, and the illuminance, the left solar radiation amount, and the right solar radiation amount are processed differently and output. For this reason, there exists a problem that the communication system of the optical sensor for vehicles will become complicated, and will enlarge.

  The present invention has been made in view of the above points, and it is an object of the present invention to provide a communication system for a vehicle optical sensor that can be simplified and miniaturized.

In order to achieve the above object, according to the first aspect of the present invention, the optical sensor (10) is connected to one of the light control unit (20) and the air conditioner control unit (30) and the first communication line (40). The light control unit (20) and the air conditioner control unit (30) are connected via the second communication line (50), and the optical sensor (10) includes the measured illuminance, the left solar radiation amount, -out based on the right amount of solar radiation, illumination, the left amount of solar radiation has a frequency converting circuit (12) for outputting a pulse signal of the right amount of solar radiation can be identified for each of the first communication line (40), an optical sensor ( The pulse signal output from 10) is input to one control unit connected to the optical sensor (10) via the first communication line (40), and the control unit and the second communication line (50). Is input to the other control unit connected via the light control unit ( 0) reads the illuminance from the pulse signal output from the optical sensor (10) and controls turning on and off of the vehicle light, and the air conditioner control unit (30) outputs the pulse signal output from the optical sensor (10). The left side solar radiation amount and the right side solar radiation amount are read out from the vehicle to control the air conditioning in the vehicle.

  In such a vehicle optical sensor communication system, a communication line connecting the optical sensor (10) and one of the control units is not required. Moreover, since the optical sensor (10) outputs a pulse signal based on the illuminance, the left solar radiation amount, and the right solar radiation amount measured from the frequency conversion circuit (12), it is not necessary to include a current amplifier circuit. Accordingly, since the number of parts can be reduced as compared with the communication system of the conventional vehicle optical sensor, the system can be simplified and the size can be reduced, and the cost can be suppressed. . Furthermore, since no current amplifier circuit is provided, the output current output from the optical sensor (10) to the current amplifier circuit can be eliminated. That is, power consumption can be reduced.

Further, the invention described in claim 2, frequency converter circuit (12), measured illuminance, the left amount of solar radiation, the next edge from the first starting edge on the basis of one of the measurements of the right insolation The first waveform (W1) adjusted for the first period (L1) up to the first end edge is output, and based on one of the remaining measurement results, the second start edge The second period (L2) until the second end edge, which is the next edge in the same direction as the second start edge, is adjusted, and the second measurement result is determined based on the other measurement result of the remaining measurement results. A second waveform in which the duty ratio of the second period (L2) is adjusted by adjusting the period (L3) between the start edge and the intermediate edge that is the edge between the second start edge and the second end edge (W2) as being to output the That.

  In such a communication system, since the second waveform (W2) indicating two measurement results among the measurement results is output, for example, a third waveform is generated separately from the second waveform (W2) to generate a waveform. Compared with a communication system that transmits one measurement result every time, the responsiveness of the optical sensor (10), the light control unit (20), and the air conditioner control unit (30) can be increased.

  In this case, as in the invention according to claim 3, in the invention according to claim 2, from the frequency conversion circuit (12), the first end edge and the second start edge become a common edge, After the first and second waveforms (W1 and W2) are output and the delimiter period (L5) that is longer than the maximum period that can be taken by the second period (L2) of the second waveform (W2) has elapsed, The first and second waveforms (W1, W2) can be output.

  In such a communication system, it is possible to easily determine the first start edge of the first waveform (W1) and the intermediate edge of the second waveform (W2) on the basis of the separation period (L5). That is, it can suppress that a control part (20, 30) malfunctions.

Further, the invention according to claim 4, frequency conversion circuit (12), measured illuminance, left insolation, the same as the start edge from the start edge on the basis of a single measurement of the right insolation A first period (L1) between the intermediate edge that is the next edge in the direction and a second period (L2) between the intermediate edge and the end edge that is the next edge in the same direction as the intermediate edge. Adjusting the sum, based on one of the remaining measurement results measured, the period (L3) between the start edge and the first edge that is an edge between the start edge and the intermediate edge ) To adjust the duty ratio of the first period (L1), and based on the other measurement result of the remaining measurement results, the intermediate edge and the intermediate edge and the end edge A second edge, which is an edge, It is characterized by outputting the adjusted waveform duty ratio of the period (L5) second period by adjusting the (L2) between.

  In such a communication system, as in the invention described in claim 2, as compared with the communication system that transmits one measurement result for each waveform, the optical sensor (10) and the light control unit ( 20) and the responsiveness with the air conditioner control unit (30) can be enhanced.

  In this case, as in the fifth aspect of the invention, the first period (L1) and the second period (L2) can be made equal in the frequency conversion circuit (12).

  In such a communication system, since the first period (L1) and the second period (L2) are equal, the start edge and the end edge can be easily determined. For this reason, it can suppress that a control part (20, 30) malfunctions.

  As in the invention described in claim 6, in the invention described in claim 4, in the frequency conversion circuit (12), if the duty ratio of the first period (L1) is D1, 0 <D1 <50 If the duty ratio D1 is adjusted within the range and the duty ratio of the second period (L2) is D2, the duty ratio D2 can be adjusted within the range of 50 <D2 <100.

  In such a communication system, the duty ratio in the first period (L1) is in a range where 0 <D1 <50, and the duty ratio in the second period (L2) is in a range where 50 <D2 <100. For this reason, it can be easily determined whether the duty ratio is the duty ratio of the first period (L1) or the second period (L2), and the control units (20, 30) malfunction. This can be suppressed.

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

It is a schematic block diagram of the communication system of the optical sensor for vehicles in 1st Embodiment of this invention. It is a figure which shows the waveform of the pulse signal output from the frequency converter circuit shown in FIG. It is a figure which shows the waveform of the pulse signal output from the frequency converter circuit in 2nd Embodiment of this invention. It is a figure which shows the waveform of the pulse signal output from a frequency conversion circuit when duty ratio D1 and duty ratio D2 are 0 <D1 and D2 <100, respectively.

(First embodiment)
A first embodiment of the present invention will be described. FIG. 1 is a schematic block diagram of a communication system for a vehicle optical sensor according to the present embodiment.

  As shown in FIG. 1, the communication system of the vehicle optical sensor according to the present embodiment includes a light sensor 10 that measures the illuminance, the left-side solar radiation amount, and the right-side solar radiation amount, and the illuminance measured by the optical sensor 10. A light control unit 20 that controls turning on and off of the vehicle light, and an air conditioner control unit 30 that controls the air conditioning in the vehicle (vehicle compartment) based on the left and right solar radiation amounts measured by the optical sensor 10. Configured.

  The optical sensor 10 and the light control unit 20 are connected via a first communication line 40 configured by a wire harness or the like, and the light control unit 20 and the air conditioner control unit 30 are configured by a second LAN cable or the like. The communication line 50 is connected. That is, the vehicle optical sensor communication system of the present embodiment transmits illuminance, left solar radiation amount, and right solar radiation amount through a one-wire transmission path. In addition, the light of this specification will not be specifically limited if it is a light with which a vehicle is equipped, For example, a vehicle width lamp, a tail lamp, a headlamp, etc. are mentioned.

  The optical sensor 10 includes a detection unit 11 that measures the illuminance outside the vehicle, the left solar radiation amount inserted into the vehicle, and the right solar radiation amount, and a frequency conversion circuit 12 that converts the measurement result into a pulse signal and outputs the pulse signal. ing. When the vehicle ignition is turned on, the illuminance, left solar radiation amount, and right solar radiation amount are measured, and the frequency conversion circuit 12 generates and outputs a pulse signal based on the illuminance, left solar radiation amount, and right solar radiation amount. . The right and left sides of the vehicle are the right and left sides of the vehicle when viewed from the rear, in other words, the driver's seat side and the passenger's seat side of the vehicle.

  Although the detection unit 11 is not particularly limited, for example, the detection unit 11 is configured by using three general photodiodes, and each photodiode measures illuminance, left-side solar radiation amount, and right-side solar radiation amount. ing. And the detection part 11 outputs the electric current value based on illumination intensity, the left solar radiation amount, and the right solar radiation amount to the frequency conversion circuit 12 as a measured value.

  In this embodiment, the frequency conversion circuit 12 includes a CPU, a ROM that stores a relationship between a current value input from the detection unit 11 and a period (frequency), and the like. Then, the period associated with the illuminance, the left solar radiation amount, and the right solar radiation current value input from the detection unit 11 is read from the ROM to generate the first and second waveforms, and the first and second waveforms are generated. Output. In the present embodiment, the frequency conversion circuit 12 generates a first waveform based on the input illuminance, and generates and outputs a second waveform based on the input left solar radiation amount and right solar radiation amount. FIG. 2 is a diagram illustrating a waveform of a pulse signal output from the frequency conversion circuit 12.

  As shown in FIG. 2, the frequency conversion circuit 12 falls based on the input illuminance as a first end edge at the time T2 that is the next edge from a rising edge at the time T1 that is the first start edge. The first waveform W1 adjusted for the first period L1 until the edge is output. Although not particularly limited, for example, a waveform in which the first period L1 of the first waveform W1 increases as the input illuminance increases can be output.

  Further, the frequency conversion circuit 12 performs the second end of the time T4 that is the next edge in the same direction as the second start edge from the falling edge of the time T2 that is the second start edge based on the input left solar radiation amount. The second period L2 until the falling edge as the edge is adjusted. Then, based on the input right solar radiation amount, a rising edge as the intermediate edge at time T3, which is an edge between the falling edge at time T2 and the falling edge at time T2 and the falling edge at time T4, By adjusting the period L3, the duty ratio of the second period L2 is adjusted and the second waveform W2 is output.

  Note that adjusting the period L3 between the rising edge at time T2 and the falling edge at time T3 is adjusting the ratio of the falling period L3 and the rising period L4 in the second period L2. The duty ratio of the second period L2 is a ratio between the second period L2 and the rising period L4 of the second period L2, and the duty ratio D is represented by D = L4 / L2.

  In addition, although not particularly limited, for example, a waveform in which the second period L2 of the second waveform W2 becomes longer as the input left solar radiation amount increases can be output. A waveform in which the duty ratio (L4 / L2) of the second waveform W2 increases as it increases can be output. The duty ratio D is 0 <D <100.

  Then, the frequency conversion circuit 12 of the present embodiment outputs the first end edge of the first waveform W1 and the second start edge of the second waveform W2 as a common edge. That is, the falling edge at time T2 is output as the first end edge of the first waveform W1 and the second start edge of the second waveform W2.

  Then, the first and second waveforms W1 and W2 are output, and after the delimiter period L5 that is longer than the maximum period that the second period L2 of the second waveform W2 can take, the illuminance is increased as described above. Based on this, a new first waveform W1 (waveform from time T5 to time T6) is generated and output, and a new second waveform W2 (waveform from time T6 to time T8) is generated based on the left solar radiation amount and the right solar radiation amount. Generate and output. In other words, the frequency conversion circuit 12 sets the waveform including the first waveform W1, the second waveform W2, and the separation period L5 as one waveform, and sequentially outputs the waveforms.

  The separation period L5 is a period for the light control unit 20 and the air conditioner control unit 30 to determine (identify) the first and second waveforms W1 and W2 from the pulse signal. That is, when there is no delimiter period L5, or when the delimiter period L5 is shorter than the maximum period that the second period L2 of the second waveform W2 can take even if there is a delimiter period L5, the rising edge of the first waveform W1. It may not be possible to distinguish between the first start edge and the intermediate edge of the second waveform W2. For this reason, the light control unit 20 and the air conditioner control unit are provided by providing a separation period L5 that is longer than the maximum period that can be taken by the second period L2 of the second waveform W2 after the first and second waveforms W1, W2. At 30, the first and second waveforms W1 and W2 can be easily determined (identified).

  For example, since the delimiter period L5 is longer than the maximum period that the second period L2 of the second waveform W2 can take, the write control unit 20 sets the rising edge immediately after the delimiter period L5 has elapsed to the first waveform. The air conditioner control unit 30 can determine that the rising edge that is not immediately after the separation period L5 is the intermediate edge of the second waveform W2 can be determined as the first start edge of W1.

  The separation period L5 may be a period longer than the maximum period that can be taken by the second period L2 of the second waveform W2, but is preferably the maximum period that can be taken by the second waveform W2. The longer the separation period L5, the longer the intervals between the first waveforms W1 and the second waveforms W2 across the separation period L5, and the lower the responsiveness between the light sensor 10, the light control unit 20, and the air conditioner control unit 30. It is to become.

  As shown in FIG. 1, the light control unit 20 is connected to the optical sensor 10 via a first communication line 40 such as a wire harness. The light control unit 20 is composed of a microcomputer centered on a well-known CPU, ROM, RAM, and the like, and when the vehicle ignition is turned on, the light control unit 20 is activated and stored in the ROM. Start execution.

  Specifically, the ROM stores a computer program for reading the first waveform W1 input immediately after the segment period L5 from the pulse signal output from the frequency conversion circuit 12. For this reason, the light control unit 20 reads the first waveform W1 from the pulse signal output from the frequency conversion circuit 12 on the basis of the separation period L5, and calculates the illuminance outside the vehicle from the first period L1 of the read first waveform W1. Judgment is performed to control lighting and extinguishing of lights such as a vehicle width lamp, a tail lamp, and a head lamp.

  The air conditioner control unit 30 is connected to the light control unit 20 via the second communication line 50 such as a LAN cable, and the pulse signal output from the frequency conversion circuit 12 passes through the air conditioner control unit 30 and the second communication line 50. Is input via. The air conditioner control unit 30 is composed of a microcomputer centered on a well-known CPU, ROM, RAM, etc., and is activated when a vehicle ignition switch is turned on. Start execution.

  Specifically, the ROM stores a computer program for reading the second waveform W2 output immediately after the first waveform W1 among the pulse signals output from the frequency conversion circuit 12. For this reason, the air conditioner control unit 30 determines the first waveform W1 from the pulse signal output from the frequency conversion circuit 12 with reference to the separation period L5, reads the second waveform W2, and reads the second of the read second waveform W2. The left solar radiation amount is determined from the period L2 to control the air conditioning on the left side of the vehicle, and the right solar radiation amount is determined from the duty ratio (L4 / L2) of the read second waveform W2 to control the air conditioning on the right side of the vehicle.

  For example, the air conditioner control unit 30 controls the air conditioning in the vehicle by controlling the driving of an actuator that rotates an airmic door that adjusts the blowing temperature provided in a general vehicle, a blower motor that adjusts the amount of blowing air, and the like. be able to.

  Next, the operation of the communication system for such a vehicle optical sensor will be described. In the vehicle optical sensor communication system of this embodiment, when the vehicle ignition is turned on, the optical sensor 10 measures the illuminance, the left solar radiation amount, and the right solar radiation amount, converts the measurement results into pulse signals, and outputs them. Specifically, as described above, the optical sensor 10 generates the first waveform W1 based on the illuminance and generates the second waveform W2 based on the left solar radiation amount and the right solar radiation amount, and the waveform shown in FIG. Is output. The output pulse signal is input to the light control unit 20 via the first communication line 40 and also input to the air conditioner control unit 30 via the second communication line 50.

  The light control unit 20 reads the first waveform W1, which is a waveform immediately after the separation period L5, of the input pulse signal, determines the illuminance from the first period L1 of the first waveform W1, and turns the light on and off. Control. In addition, the air conditioner control unit 30 reads the second waveform W2 that is the waveform immediately after the first waveform W1 from the input pulse signal, determines the left solar radiation amount from the second period L2 of the second waveform W2, and determines the second solar radiation amount. The right solar radiation amount is determined from the duty ratio (L4 / L2) of the two waveforms W2, and the air conditioning in the vehicle is controlled.

  As described above, in the vehicle optical sensor communication system of the present embodiment, the optical sensor 10 is connected to the light control unit 20 via the first communication line 40, and the light control unit 20 and the air conditioner control unit 30 are connected to each other. They are connected via the second communication line 50. Then, the optical sensor 10 converts the measured illuminance, the left solar radiation amount, and the right solar radiation amount into pulse signals and outputs them, and the pulse signals are input to the light control unit 20 via the first communication line 40 and the first communication. Input to the air conditioner control unit 30 via the line 40, the light control unit 20, and the second communication line 50.

  For this reason, the communication line which connects the air-conditioner control part 30 and the optical sensor 10 becomes unnecessary. Further, the optical sensor 10 does not have to include a current amplification circuit. Therefore, the number of parts can be reduced as compared with the conventional vehicle photosensor communication system, so that the system can be simplified and the system can be miniaturized and the cost can be reduced. You can also. Furthermore, since no current amplification circuit is provided, the output current output from the optical sensor 10 to the current amplification circuit can be eliminated. That is, power consumption can be reduced.

  Further, the optical sensor 10 outputs the first and second waveforms W1 and W2 in a state where the first end edge and the second start edge are common edges, and the second period L2 of the second waveform W2 can be taken. New first and second waveforms W1 and W2 are output after a lapse period L5 which is longer than the maximum period has elapsed. For this reason, the light control unit 20 and the air conditioner control unit 30 can easily distinguish the first start edge of the first waveform W1 and the intermediate edge of the second waveform W2 based on the separation period L5. That is, it is possible to prevent the light control unit 20 and the air conditioner control unit 30 from malfunctioning.

  Further, for example, when the ECU of the light control unit 20 is reset due to external noise or the like, when the illuminance is small, that is, when the outside of the vehicle is dark, there is a possibility that the driving may be hindered unless the light is turned on immediately. In the present embodiment, since the second waveform W2 shows two measurement results of the left solar radiation amount and the right solar radiation amount, for example, a third waveform is generated separately from the second waveform W2, and one waveform is generated for each waveform. Compared with a communication system that outputs measurement results, the interval between the first waveforms W1 with the second waveform W2 and the separation period L5 interposed therebetween can be shortened. For this reason, the responsiveness of the optical sensor 10 and the light control part 20 can be improved. Generally, since the response due to human reflection is 200 ms, the light control is performed by setting the sum of the maximum period that the first waveform W1 and the second waveform W2 can take and the separation period L5 within 200 ms. Even if the ECU of the unit 20 is reset, it is possible to control lighting and extinguishing after resetting without giving a strange feeling to the person.

  Similarly, since the interval between the first waveform W1 and the second waveform W2 across the separation period L5 can be shortened, the responsiveness between the optical sensor 10 and the air conditioner control unit 30 can also be improved.

(Second Embodiment)
A second embodiment of the present invention will be described. In the present embodiment, the waveform output from the frequency conversion circuit 12 is changed with respect to the first embodiment, and the others are the same as those in the first embodiment, and thus the description thereof is omitted here. FIG. 3 is a diagram illustrating a waveform output from the frequency conversion circuit 12.

  As shown in FIG. 3, the frequency conversion circuit 12 uses the falling edge at the time T1, which is the start edge based on the input illuminance, as the intermediate edge at the time T3, which is the next edge in the same direction as the start edge. The first period L1 until the falling edge of the second period L2 and the second period L2 from the falling edge at the time T3 to the falling edge as the end edge of the time T5 that is the next edge in the same direction as the edge Adjust the sum. That is, the period L0 from the falling edge at time T1 to the falling edge at time T5 is adjusted. Further, the first period L1 and the second period L2 are made equal.

  The reason for making the first period L1 and the second period L2 equal is to allow the write control unit 20 to determine the start edge and end edge of the pulse signal. Specifically, as will be described later, the write control unit 20 reads the sum of three consecutive falling edges and the same period between the two falling edges. For this reason, for example, when the second period L2 from the time T3 to the time T5 is different from the period L7 from the time T5 to the time T7, the write control unit 20 determines that the falling edge at the time T3 is not the start edge. It is determined that the period from time T3 to time T7 is not data indicating illuminance.

  In addition, the frequency conversion circuit 12 determines, based on the input left solar radiation amount, the falling edge at the time T1 and the edge between the falling edge at the time T1 and the falling edge at the time T3. The duty ratio (L4 / L1) of the first period L1 is adjusted by adjusting the period L3 between the rising edge as one edge.

  Based on the input right solar radiation amount, the rising edge as the second edge at time T4, which is the falling edge at time T3 and the edge between the falling edge at time T3 and the falling edge at time T5 By adjusting the period L5 between and the second period L2, the duty ratio (L6 / L2) of the second period L2 is adjusted.

  In the present embodiment, the duty ratio D1 in the first period L1 is in a range that satisfies 0 <D1 <50, and the duty ratio D2 in the second period L2 is in a range that satisfies 50 <D2 <100. This is because the air conditioner control unit 30 can determine whether the read duty ratio is the left solar radiation amount or the right solar radiation amount.

  FIG. 4 is a diagram illustrating waveforms output from the frequency conversion circuit 12 when the duty ratio D1 and the duty ratio D2 are 0 <D1 and D2 <100, respectively. As shown in FIG. 4, when the illuminance outside the vehicle is constant, the first period L1 from time T1 to time T3, the second period L2 from time T3 to time T5, from time T5 to time T7 The periods L7 may be equal to each other. In such a case, it cannot be determined whether the start edge of the waveform is time T1 or time T3. In this case, if the duty ratio D1 and the duty ratio D2 are 0 <D1 and D2 <100, respectively, and the duty ratio during the period from the start edge to the intermediate edge is read as the left solar radiation amount, the start edge Therefore, the air conditioner control unit 30 cannot determine whether the read duty ratio is the left solar radiation amount or the right solar radiation amount.

  However, as in the present embodiment, the air conditioner control unit 30 reads out by setting the duty ratio D1 indicating the left solar radiation amount to 0 <D1 <50 and setting the duty ratio indicating the right solar radiation amount to 50 <D2 <100. It can be determined whether the duty ratio is the left solar radiation amount or the right solar radiation amount.

  In the present embodiment, the ROM of the write control unit 20 is the sum of the pulse signals output from the frequency conversion circuit 12 that have the same period between three consecutive falling edges and two falling edges. Is stored. For this reason, since the 1st period L1 and the 2nd period L2 are made equal, the light control part 20 determines illumination intensity from the period L0, and controls a vehicle light. In other words, since the period L2 between the time point T3 and the time point T5 and the period L7 between the time point T5 and the time point T7 are different, it is determined that the period between the time point T3 and the time point T7 is not a waveform indicating illuminance. To do.

  The ROM of the air conditioner control unit 30 stores a computer program that reads a duty ratio in a period between two falling edges of the pulse signal output from the frequency conversion circuit 12. Therefore, when the duty ratio D in the read period is 0 <D <50, the air conditioner control unit 30 determines the left solar radiation amount from the duty ratio and controls the air conditioning on the left side of the vehicle. When D is 50 <D <100, the right solar radiation amount is determined from the duty ratio to control the air conditioning on the right side of the vehicle.

  In such a vehicle optical sensor communication system, when the vehicle ignition is turned on, the optical sensor 10 measures the illuminance, the left solar radiation amount, and the right solar radiation amount, and outputs the pulse signal shown in FIG. 3 as described above. To do.

  Then, the light control unit 20 reads the sum of the pulse signals input from the optical sensor 10 having the same period between three consecutive falling edges and two falling edges, that is, the period L0 in this embodiment. The illuminance is determined from the read period L0 to control turning on and off of the vehicle light. Further, the air conditioner control unit 30 reads the duty ratios D1 and D2 of the first and second periods L1 and L2 from the pulse signal output from the optical sensor 10, determines the left solar radiation amount from the duty ratio D1, and sets the duty ratio D2. The amount of solar radiation on the right side is determined and air conditioning in the vehicle is controlled.

  As described above, in the vehicle optical sensor communication system of the present embodiment, the intermediate edge is provided between the start edge and the end edge, and the first period L1 between the start edge and the intermediate edge The second period L2 between the intermediate edge and the end edge is made equal. For this reason, the light control unit 20 can obtain the period L0 indicating the illuminance by reading the sum of the period from the three consecutive falling edges to the two falling edges being equal. That is, the write control unit 20 can easily distinguish between the start edge and the end edge, and can prevent the write control unit 20 from malfunctioning.

  Further, the duty ratio D1 in the first period is in a range satisfying 0 <D1 <50, and the duty ratio D2 in the second period is in a range satisfying 50 <D2 <100. Therefore, the air conditioner control unit 30 can easily determine whether the read duty ratio is data indicating the right solar radiation amount or data indicating the left solar radiation amount. That is, the malfunction of the air conditioner control unit 30 can be suppressed.

  As mentioned above, also as a communication system of the photosensor for vehicles of this embodiment, the same effect as a 1st embodiment of the above can be acquired.

(Other embodiments)
In the first embodiment, the example in which the optical sensor 10 and the light control unit 20 are connected via the first communication line 40 has been described. For example, the optical sensor 10 and the air conditioner control unit 30 perform the first communication. It may be connected via a line 40.

  In the first embodiment, the illuminance is shown in the first period L1 of the first waveform W1, the left solar radiation amount is shown in the second period L2 of the second waveform W2, and the duty ratio of the second waveform W2 is used. Although what showed the amount of solar radiation on the right side was demonstrated, it is not limited to this. For example, the left solar radiation amount is shown in the first period L1 of the first waveform W1, the right solar radiation amount is shown in the second period L2 of the second waveform W2, and the illuminance is shown by the duty ratio of the second waveform W2. The relationship between the period and duty ratio, the illuminance, the left solar radiation amount, and the right solar radiation amount can be changed as appropriate.

  Similarly, in the second embodiment, the left solar radiation amount is shown in the sum period L0 of the first period L1 and the second period L2, the right solar radiation amount is shown in the duty period of the first period L1, and the second The illuminance may be indicated by the duty ratio of the period L2, and the relationship between the period and the duty ratio and the illuminance, the left solar radiation amount, and the right solar radiation amount can be appropriately changed.

  Moreover, although the said 1st Embodiment demonstrated what showed two measurement results in the 2nd waveform W2, it can also be made to show two measurement results in the 1st waveform W1. In this case, the delimiter period L5 is a period longer than the maximum period that the first period L1 of the first waveform W1 can take.

  Further, in the first embodiment, the rising edge corresponds to the first start edge of the first waveform W1 of the present invention, and the falling edge corresponds to the first end edge of the first waveform W1 of the present invention. However, the present invention is not limited to this. That is, for example, the first start edge of the first waveform W1 may be a falling edge, and the first end edge of the first waveform W1 may be a rising edge. Similarly, the second start edge of the second waveform W2 may be a rising edge, the intermediate edge of the second waveform W2 may be a falling edge, or the second end edge of the second waveform W2 may be It may be a rising edge.

  The same applies to the second embodiment, and the start edge of the waveform may be a rising edge, and the end edge may be a rising edge. The intermediate edge may be a rising edge, the first edge may be a falling edge, or the second edge may be a falling edge.

  In the first and second embodiments, the frequency conversion circuit 12 has been described as having the ROM or the like in which the relationship between the current value and the period (frequency) is stored. However, the present invention is not limited to this. The frequency conversion circuit 12 may be anything as long as it can output the waveforms shown in FIGS. For example, the frequency conversion circuit 12 is configured to have a transmission circuit and a frequency dividing circuit, and the capacitor of the transmission circuit is charged and discharged based on the current values of illuminance, left solar radiation amount, and right solar radiation amount, and a transmission waveform is generated by the comparator. The waveform shown in FIG. 2 or FIG. 3 can be output by dividing the transmission waveform by a frequency dividing circuit.

DESCRIPTION OF SYMBOLS 10 Optical sensor 11 Detection part 12 Frequency conversion circuit 20 Light control part 30 Air-conditioner control part 40 1st communication line 50 2nd communication line

Claims (6)

An optical sensor (10) for measuring an illuminance outside the vehicle, a right solar radiation amount and a left solar radiation amount inserted into the vehicle;
A light control unit (20) for controlling turning on and off of the vehicle light based on the illuminance measured by the light sensor (10);
An air conditioner control unit (30) for controlling air conditioning in the vehicle based on the right solar radiation amount and the left solar radiation amount measured by the optical sensor (10);
The light sensor (10) is connected to one control unit of the light control unit (20) or the air conditioner control unit (30) via a first communication line (40), and the light control unit (20) The air conditioner control unit (30) is connected via the second communication line (50),
Said light sensor (10) is measured the illuminance, the left insolation, the-out based on the right amount of solar radiation, the illumination, the left solar radiation, the said right amount of sunlight can be identified for each pulse signal a It has a frequency conversion circuit (12) that outputs to one communication line (40) ,
The pulse signal output from the optical sensor (10) is input to one control unit connected to the optical sensor (10) via the first communication line (40), and the control unit Input to the other control unit connected via the second communication line (50),
The light control unit (20) reads the illuminance from the pulse signal output from the optical sensor (10) to control turning on and off of the vehicle light,
The air conditioner control unit (30) reads the left solar radiation amount and the right solar radiation amount from the pulse signal output from the optical sensor (10) to control air conditioning in the vehicle. Optical sensor communication system. An optical sensor (10) for measuring an illuminance outside the vehicle, a right solar radiation amount and a left solar radiation amount inserted into the vehicle;
A light control unit (20) for controlling turning on and off of the vehicle light based on the illuminance measured by the light sensor (10);
An air conditioner control unit (30) for controlling air conditioning in the vehicle based on the right solar radiation amount and the left solar radiation amount measured by the optical sensor (10);
The light sensor (10) is connected to one control unit of the light control unit (20) or the air conditioner control unit (30) via a first communication line (40), and the light control unit (20) The air conditioner control unit (30) is connected via the second communication line (50),
The optical sensor (10) includes a frequency conversion circuit (12) that outputs a pulse signal based on the measured illuminance, the left solar radiation amount, and the right solar radiation amount,
The pulse signal output from the optical sensor (10) is input to one control unit connected to the optical sensor (10) via the first communication line (40), and the control unit Input to the other control unit connected via the second communication line (50),
The light control unit (20) reads the illuminance from the pulse signal output from the optical sensor (10) to control turning on and off of the vehicle light,
The air conditioner control unit (30) reads the left solar radiation amount and the right solar radiation amount from the pulse signal output from the optical sensor (10) to control air conditioning in the vehicle ,
The frequency conversion circuit (12)
Based on the measurement result of one of the measured illuminance, the right solar radiation amount, and the left solar radiation amount, the first period (L1) from the first start edge to the first end edge as the next edge is adjusted. Output the first waveform (W1)
The second period (L2) from the second start edge to the second end edge that is the next edge in the same direction as the second start edge is adjusted based on one of the remaining measurement results. And, based on the other measurement result of the remaining measurement results, the second start edge and an intermediate edge that is an edge between the second start edge and the second end edge A vehicle photosensor communication system characterized by outputting a second waveform (W2) in which the duty ratio of the second period (L2) is adjusted by adjusting the period (L3) between them.   The frequency conversion circuit (12) outputs the first and second waveforms (W1, W2) in a state where the first end edge and the second start edge are common edges, and the second waveform ( The first and second waveforms (W1, W2) are output after the lapse of the delimiter period (L5), which is longer than the maximum period that can be taken by the second period (L2) of W2). The communication system of the optical sensor for vehicles of Claim 2. An optical sensor (10) for measuring an illuminance outside the vehicle, a right solar radiation amount and a left solar radiation amount inserted into the vehicle;
A light control unit (20) for controlling turning on and off of the vehicle light based on the illuminance measured by the light sensor (10);
An air conditioner control unit (30) for controlling air conditioning in the vehicle based on the right solar radiation amount and the left solar radiation amount measured by the optical sensor (10);
The light sensor (10) is connected to one control unit of the light control unit (20) or the air conditioner control unit (30) via a first communication line (40), and the light control unit (20) The air conditioner control unit (30) is connected via the second communication line (50),
The optical sensor (10) includes a frequency conversion circuit (12) that outputs a pulse signal based on the measured illuminance, the left solar radiation amount, and the right solar radiation amount,
The pulse signal output from the optical sensor (10) is input to one control unit connected to the optical sensor (10) via the first communication line (40), and the control unit Input to the other control unit connected via the second communication line (50),
The light control unit (20) reads the illuminance from the pulse signal output from the optical sensor (10) to control turning on and off of the vehicle light,
The air conditioner control unit (30) reads the left solar radiation amount and the right solar radiation amount from the pulse signal output from the optical sensor (10) to control air conditioning in the vehicle ,
The frequency conversion circuit (12)
A first period between a start edge and an intermediate edge that is the next edge in the same direction as the start edge based on the measurement result of one of the measured illuminance, the right solar radiation amount, and the left solar radiation amount ( L1) and the sum of the second period (L2) from the intermediate edge to the end edge, which is the next edge in the same direction as the intermediate edge,
A period (L3) between the start edge and a first edge that is an edge between the start edge and the intermediate edge is adjusted based on one of the remaining measurement results. By adjusting the duty ratio of the first period (L1),
A period (L5) between the intermediate edge and a second edge that is an edge between the intermediate edge and the end edge is adjusted based on the other measurement result of the remaining measurement results. To output a waveform in which the duty ratio of the second period (L2) is adjusted .   The communication system of the vehicle photosensor according to claim 4, wherein the frequency conversion circuit (12) equalizes the first period (L1) and the second period (L2). The frequency conversion circuit (12) adjusts the duty ratio D1 in a range of 0 <D1 <50, where D1 is the duty ratio of the first period (L1), and the duty ratio of the second period (L2). 6. The vehicle optical sensor communication system according to claim 4, wherein the duty ratio D2 is adjusted in a range of 50 <D2 <100, where the ratio is D2.

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