VEHICLE CONTROL SYSTEM
First Claim
1. A vehicle control system comprising:
- a portable unit carried by a user of a vehicle for transmitting a first radio signal for a keyless entry system for remotely operating equipment of the vehicle;
a vehicle condition detector mounted in the vehicle for transmitting a second radio signal for a vehicle condition monitoring system; and
an in-vehicle receiver mounted in the vehicle for receiving the first radio signal and the second radio signal,wherein the portable unit transmits the first radio signal through a plurality of channels different in frequency, andwherein the in-vehicle receiver includes;
a receiving antenna for receiving the first radio signal and the second radio signal;
a channel determining means for determining an optimal channel, which is in a most favorable state of communication, among the plurality of channels;
a frequency conversion means selecting either the first radio signal or the second radio signal in any of the plurality of channels from among signals received by the receiving antenna and converting the signal into an intermediate frequency signal of a specific frequency;
a demodulating means for demodulating the intermediate frequency signal outputted from the frequency conversion circuit; and
a controlling means for causing the frequency conversion means to select the second radio signal when a demodulated signal of the second radio signal is to be acquired from the demodulating means, and causing the frequency conversion means to select the first radio signal in the optimal channel determined by the channel determining means when a demodulated signal of the first radio signal is to be acquired from the demodulating means.
1 Assignment
0 Petitions
Accused Products
Abstract
When a demodulated signal of a radio signal in Ch1 transmitted from a TPMS transmitter is acquired, a control IC controls the frequency of a signal inputted from a PLL circuit to a mixer into a frequency for converting a TPMS radio signal into an intermediate frequency signal of a specific frequency. When the demodulated signal of the radio signal transmitted from a portable unit through two frequency channels is acquired, the control IC determines a channel whose state of communication is favorable from between Ch2 and Ch3, and controls the signal frequency for conversion into a frequency for converting a keyless radio signal in the determined channel into an intermediate frequency signal.
16 Citations
22 Claims
-
1. A vehicle control system comprising:
-
a portable unit carried by a user of a vehicle for transmitting a first radio signal for a keyless entry system for remotely operating equipment of the vehicle; a vehicle condition detector mounted in the vehicle for transmitting a second radio signal for a vehicle condition monitoring system; and an in-vehicle receiver mounted in the vehicle for receiving the first radio signal and the second radio signal, wherein the portable unit transmits the first radio signal through a plurality of channels different in frequency, and wherein the in-vehicle receiver includes; a receiving antenna for receiving the first radio signal and the second radio signal; a channel determining means for determining an optimal channel, which is in a most favorable state of communication, among the plurality of channels; a frequency conversion means selecting either the first radio signal or the second radio signal in any of the plurality of channels from among signals received by the receiving antenna and converting the signal into an intermediate frequency signal of a specific frequency; a demodulating means for demodulating the intermediate frequency signal outputted from the frequency conversion circuit; and a controlling means for causing the frequency conversion means to select the second radio signal when a demodulated signal of the second radio signal is to be acquired from the demodulating means, and causing the frequency conversion means to select the first radio signal in the optimal channel determined by the channel determining means when a demodulated signal of the first radio signal is to be acquired from the demodulating means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A vehicle control system comprising:
-
a portable unit carried by a user of a vehicle for transmitting a first radio signal for a keyless entry system for remotely operating equipment of the vehicle; a vehicle condition detector mounted in the vehicle for transmitting a second radio signal for a vehicle condition monitoring system; and an in-vehicle receiver mounted in the vehicle and receiving the first radio signal and the second radio signal, wherein the portable unit transmits the first radio signal through a plurality of channels different in frequency, and wherein the in-vehicle receiver includes; a receiving antenna for receiving the first radio signal and the second radio signal; a first frequency conversion means for selecting either the first radio signal in any of the plurality of channels or the second radio signal from among the signals received by the receiving antenna, and converting the signal into an intermediate frequency signal of a specific frequency; a second frequency conversion means for converting the first radio signal in a channel not under control of the first frequency conversion circuit into an intermediate frequency signal of a specific frequency; a first demodulating means for demodulating the intermediate frequency signal outputted from the first frequency conversion means; and a second demodulating means for demodulating the intermediate frequency signal outputted from the second frequency conversion means. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
-
Specification