US 11,833,864 B2
Tire pressure monitoring system
Ryosuke Kanbayashi, Kariya (JP); Takatoshi Sekizawa, Kariya (JP); and Masashi Mori, Kariya (JP)
Assigned to DENSO CORPORATION, Kariya (JP)
Filed by DENSO CORPORATION, Kariya (JP)
Filed on Apr. 7, 2021, as Appl. No. 17/224,197.
Application 17/224,197 is a continuation of application No. PCT/JP2019/039895, filed on Oct. 9, 2019.
Claims priority of application No. 2018-192061 (JP), filed on Oct. 10, 2018.
Prior Publication US 2021/0221186 A1, Jul. 22, 2021
Int. Cl. B60C 23/04 (2006.01)
CPC B60C 23/0416 (2013.01) [B60C 23/0462 (2013.01); B60C 23/0488 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A tire pressure monitoring system comprising:
a transceiver provided on a spare wheel in a vehicle and a receiver provided on a vehicle body; and
a receiver provided on the vehicle body, wherein
the transceiver includes
a sensing unit having a pressure sensor configured to output a detection signal indicating a tire pressure of the spare wheel,
a first control unit configured to process a detection signal indicating the tire pressure and create a frame stored as data related to the tire pressure, and
a first transceiver portion configured to transmit the frame, the receiver includes
a second transceiver portion configured to receive the frame and transmit a response signal indicating that the frame is received, and
a second control unit configured to detect the tire pressure based on the data related to the tire pressure stored in the frame when the frame is received, and configured to transmit the response signal from the second transceiver portion,
after the transceiver performs frame transmission in an intermittent drive cycle in which frame transmission is performed at predetermined transmission cycles, upon receiving the response signal, the transceiver sets a stop period longer than the transmission cycle of the intermittent drive cycle, and stops the frame transmission during the stop period, and
the transceiver transmits the frame even during the stop period, when the tire pressure of the spare wheel is detected based on the data related to the tire pressure, and when at least one of change amount in the tire pressure from a previous frame transmission exceeds a threshold value, and the tire pressure becomes equal to or less than a set value occurs,
the receiver transmits date of an alarm threshold value to the transceiver,
the transceiver determines a decrease in tire pressure by using the alarm threshold value indicated by the alarm threshold data transmitted from the receiver as a set value, and
when returning the response signal, the receiver transmits a connection request signal by including it in the response signal or separately from the response signal, and transmits the data of the alarm threshold value to the transceiver when the connection with the transceiver is formed.