JP4029057B2 - Power receiver for vehicle receiver - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a power supply device for a vehicle receiver that receives a transmission signal from a keyless remote control device and supplies driving power to a vehicle receiver that receives a transmission signal from a tire pressure sensor.
[0002]
[Prior art]
In a vehicle keyless remote control device, communication is performed between a remote control device carried by a user and a receiver mounted on a vehicle, and when the ID is verified, the door lock is unlocked. At this time, since the receiver needs to reliably receive the transmission signal from the remote controller, it is repeatedly turned on and off at a predetermined cycle. That is, when the receiver is always on, the battery voltage is consumed, so the on and off states are controlled so that, for example, the on time is 20 [msec] and the off time is 180 [msec]. ing. As a result, the user can communicate with the receiver by pressing the switch of the remote controller for at least 0.2 seconds (200 [msec]).
[0003]
On the other hand, in recent years, an increasing number of vehicles are equipped with a tire air pressure detection system for detecting tire air pressure and notifying the user in real time. In this system, a pneumatic sensor is mounted on each tire (usually four tires) mounted on a vehicle, a pneumatic signal is transmitted every predetermined time, and the pneumatic signal is received by an on-vehicle receiver. And displayed on a display unit such as an instrument panel.
[0004]
At this time, the air pressure sensor is activated by the rotation of the tire and transmits an air pressure signal at a predetermined cycle. Therefore, when the ignition is turned on, the receiver is supplied with the power supply voltage and is activated.
[0005]
Furthermore, in recent years, in order to simplify the device, the keyless remote control device and the receiver for the tire air pressure detection system described above are shared, and the transmission signal from the keyless remote control device and the air pressure sensor are used by one receiver. The one that receives the transmission signal is used.
[0006]
However, since the reception sensitivity when receiving the output signal of the remote control device and the reception sensitivity when receiving the output signal of the air pressure sensor are different, in order to receive both, the reception sensitivity of the receiver is higher. It is necessary to match the reception sensitivity.
[0007]
In other words, when receiving the air pressure signal from the air pressure sensor, it is possible to sufficiently receive even with a relatively low reception sensitivity, but when receiving the output signal of the remote controller, a high reception sensitivity is required. It is necessary to always set the reception sensitivity of the remote controller output.
[0008]
Therefore, when the receiver receives the air pressure signal from the air pressure sensor while the vehicle is running, it will receive as much noise as the reception sensitivity is high. There is a case where a microcomputer included in the apparatus shifts to interrupt processing.
[0009]
For this reason, there is a drawback that the load on the entire BCM (body control module) connected to the keyless remote controller increases.
[0010]
[Problems to be solved by the invention]
As described above, in the conventional keyless remote control device and the receiver shared with the air pressure detection system, the microcomputer of the keyless remote control device may operate due to the influence of noise during vehicle traveling. However, there is a problem in that the load on the BCM increases, affecting the processing of other systems, and there has been a growing demand for noise reduction.
[0011]
The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide a power supply device capable of reducing the influence of noise received by a vehicle receiver when the ignition is on. It is to provide.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, the invention described in claim 1 of the present application supplies a driving power to a vehicle receiver that receives a transmission signal from a keyless remote control device and receives a transmission signal from a tire pressure sensor. in the power supply device, when the ignition is turned off, a pulsed power signal to the intermittent operation, the forces out to the first of said vehicular receiver output timing, at the time of ignition oN, the pulsed power signal to the intermittent operation, the first output characterized by force out the vehicle receiver at different second output timing of the timing.
[0013]
According to a second aspect of the present invention, there is provided a power supply apparatus for receiving a transmission signal from a keyless remote controller and supplying a driving voltage to a vehicle receiver that receives a transmission signal from a tire pressure sensor. A pulse voltage generation means for generating a pulse voltage signal that intermittently operates at a desired output timing from a DC voltage based on a clock signal output from the clock generation means; and a pulse voltage signal output from the pulse voltage generation means and a control means for controlling the output timing, the control means, ignition off times, a pulse voltage signal as a first output timing, ignition on and sometimes differs from a pulse voltage signal of the first output timing A control signal is output to the pulse voltage generation means to obtain the second output timing. The features.
[0014]
The invention according to claim 3 is characterized in that the second output timing is set to have a larger duty ratio or a shorter cycle than the first output timing .
[0015]
According to a fourth aspect of the present invention, the first output timing is set as an output timing at which a transmission signal from the keyless remote control device can be received, and the second output timing is output from the tire pressure sensor. It is characterized in that it is set as an output timing at which a transmission signal can be received .
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory view showing a state in which a vehicle receiver 10 (a receiver shared with a keyless remote control device and a tire air pressure detection system) is mounted inside a vehicle. As shown in FIG. The machine 10 receives a transmission signal output from the air pressure sensor 11 attached to each tire (four tires) and receives a transmission signal output from the keyless remote control machine 12. Further, it is driven by a voltage supplied from the power supply device 1.
[0017]
FIG. 2 is a block diagram showing a configuration of an embodiment of a power supply device for a vehicle receiver according to the present invention. As shown in the figure, the power supply device 1 includes a clock generator (clock generation means) 2 that outputs a clock signal, and counts the number of pulses output from the clock generator 2 to obtain a desired duty ratio. A counter 3 for outputting a pulse signal and an output circuit (pulse voltage generation means) 4 for generating a voltage signal having a duty ratio output from the counter 3 and outputting it to the receiver 10, and when the ignition is on, or A CPU (control means) 5 that outputs a command signal for generating a pulse voltage signal (pulse power signal) having different duty ratios in the off state, and a comparator 6 that compares the output signal of the CPU 5 and a reference voltage signal And.
[0018]
The receiver 10 has a lower reception signal level, that is, the keyless remote controller 12 so that both the transmission signal from the keyless remote controller 12 and the transmission signal from the air pressure sensor 11 can be received. The receiving sensitivity is set so that the transmitted signal can be received.
[0019]
Next, the operation of the power supply device 1 according to the present embodiment configured as described above will be described with reference to the flowchart shown in FIG.
[0020]
First, the CPU 5 detects the ignition on / off state (step ST1). If the ignition is off (“on” in step ST1), the pulse voltage signal output from the output circuit 4 is output to the first output timing. Therefore, a command signal is output to the counter 3 (step ST2).
[0021]
On the other hand, when the ignition is on ("ON" in step ST1), a command signal is output to the counter 3 so that the pulse signal output from the output circuit 4 is set to the second output timing (step ST3).
[0022]
The receiver 10 intermittently turns on and off at the timing of the pulse voltage signal supplied from the output circuit 4. Here, the “timing” of the pulse voltage signal indicates at least one of the cycle of the pulse voltage signal or the duty ratio.
[0023]
Hereinafter, the first output timing and the second output timing will be described in detail. The first output timing is when the ignition is off and may be a timing at which a transmission signal from the keyless remote control device 12 can be received. For example, as shown in FIG. 4, the on time is 20 [msec]. The pulse voltage is set to a pulse voltage of 200 [msec] with an off time of 180 [msec].
[0024]
That is, when the user presses the operation switch of the keyless remote controller 12 for 0.2 seconds (200 [msec]), the receiver 10 can reliably receive the transmission signal transmitted from the keyless remote controller 12. The door can be locked and unlocked without fail.
[0025]
The second output timing is when the ignition is on and may be a timing at which a transmission signal from the air pressure sensor 11 can be received. The transmission signal from the tire pressure sensor 11 is usually transmitted for about 1 second at 1 minute intervals, and the same signal is output eight times during this one second. For example, as shown in FIG. 5B, the signal is a signal in which a transmission time of 13 [msec] and an interval time of about 150 [msec] are repeated. The interval time is randomly changed and is 175 [msec] or 125 [msec].
[0026]
Then, a transmission signal as shown in FIG. 7B is generated for each pneumatic sensor 11 provided in each tire (four in the case of four wheels).
[0027]
Therefore, in order to receive a transmission signal output from each air pressure sensor 11, the CPU 5 outputs a control command signal to the output circuit 4 so that both the on time and the off time are 13 [msec].
[0028]
As a result, the pulse voltage signal output from the output circuit 4 outputs to the receiver 10 a pulse voltage signal having an on time and an off time of 13 [msec] as shown in FIG. The receiver 10 is turned on and off at the timing.
[0029]
Therefore, the receiver 10 can reliably receive the transmission signal output from each air pressure sensor 11 and can notify the vehicle occupant of the current air pressure state in real time.
[0030]
Thus, by switching the output timing of the pulse voltage signal between when the ignition is on and when the ignition is off, the output signal from the keyless remote controller 12 and the transmission signal output from each air pressure sensor 11 can be reliably received. Can do it.
[0031]
Thus, in the vehicle receiver power supply apparatus according to the present embodiment, when the ignition is on, the pulse voltage signal of the pulse voltage signal is set so that the transmission signal from the keyless remote controller 12 can be received. On and off times are set, and on the other hand, when the ignition is off, the on and off times of the pulse voltage signal are set so that the transmission signal output from the air pressure sensor 11 can be received. .
[0032]
Therefore, the transmission signal from the keyless remote controller 12 and the transmission signal from the air pressure sensor 11 can be reliably received. Even when the ignition is on, the receiver 10 can be intermittently operated instead of being continuously on. Therefore, when the ignition is on, the receiver 10 is output from the air pressure sensor 11. Receiving noise components other than the transmission signal can be significantly reduced.
[0033]
As a result, it is possible to reduce the occurrence of trouble that the microcomputer included in the keyless remote control device shifts to interrupt processing due to the occurrence of noise, and the burden on the BCM can be reduced.
[0034]
As mentioned above, although the power supply device of the receiver for vehicles of this invention was demonstrated based on embodiment of illustration, this invention is not limited to this, The structure of each part is arbitrary structures which have the same function. Can be replaced with something.
[0035]
For example, the pulse voltage signal at the time of ignition off is exemplified by the waveform shown in FIG. 4, but the present invention is not limited to this. Moreover, although the example shown in FIG. 5A is given as the pulse voltage signal when the ignition is turned on, the present invention is not limited to this.
[0036]
In this embodiment, the example of controlling the pulse voltage signal supplied to the receiver 10 has been described. However, the present invention is not limited to this, and the pulse current signal (pulse power) is controlled to be received. A configuration in which the machine 10 is switched on and off is also possible.
[0037]
【The invention's effect】
As described above, in the power receiver for a vehicle receiver according to the present invention, when the ignition is off, the driving power is supplied to the receiver at the first output timing, and at the second output timing when the ignition is on. To supply driving power. Therefore, the transmission signal from the keyless remote control device can be reliably received. Moreover, the transmission signal from the air pressure sensor mounted on each tire can be received with high accuracy.
[0038]
Furthermore, since the pulse voltage signal is supplied so that the receiver is intermittently turned on and off at the second output timing when the ignition is on, compared with the conventional example in which the receiver is always on, The influence can be reduced. That is, it is possible to remarkably reduce the shift to the microcomputer interrupt processing of the keyless remote control device when noise occurs, and thus the load on the BCM can be reduced.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a state in which a power supply device for a vehicle receiver according to the present invention is mounted in a vehicle.
FIG. 2 is a block diagram showing a configuration of a power supply device for a vehicle receiver according to an embodiment of the present invention.
FIG. 3 is a flowchart showing the operation of the power supply device for the vehicle receiver according to the embodiment of the present invention.
FIG. 4 is a timing chart showing the timing of a pulse voltage signal output to the receiver when the ignition is off.
FIG. 5 is a timing chart showing the timing of the pulse voltage signal output to the receiver when the ignition is on.
[Explanation of symbols]
1 Power supply device 2 Clock generator (clock generation means)
3 Counter 4 output circuit (pulse voltage generation means)
5 CPU (control means)
6 Comparator 10 Receiver 11 Air Pressure Sensor 12 Keyless Remote Controller

Claims (4)

In the power supply device that receives the transmission signal from the keyless remote control device and supplies the driving power to the vehicle receiver that receives the transmission signal from the tire pressure sensor,
During ignition off, the pulsed power signal to the intermittent operation, the forces out to the vehicle receiver at a first output timing, when ignition ON, the pulsed power signal to intermittent operation, different from the first output timing power device for a vehicle receiver, characterized in that the force output to the vehicle receiver at a second output timing. In a power supply apparatus that receives a transmission signal from a keyless remote control device and supplies a drive voltage to a vehicle receiver that receives a transmission signal from a tire pressure sensor,
Clock generation means;
Based on the clock signal output from the clock generation means, pulse voltage generation means for generating a pulse voltage signal that intermittently operates from the DC voltage at a desired output timing;
Control means for controlling the output timing of the pulse voltage signal output from the pulse voltage generation means,
Said control means, ignition off times, a pulse voltage signal as a first output timing, ignition ON times, the pulse control signals in order to a different second output timing and a pulse voltage signal of the first output timing A power supply device for a vehicle receiver, characterized in that the power is output to a voltage generating means. 3. The second output timing according to claim 1, wherein a duty ratio is set larger or a cycle is set shorter than the first output timing. A power receiver for a vehicle receiver. The first output timing is set as an output timing capable of receiving a transmission signal from the keyless remote control device, and the second output timing is set as an output timing capable of receiving a transmission signal from the tire pressure sensor. It sets , The power supply device of the receiver for vehicles of any one of Claims 1-3 characterized by the above-mentioned.

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