摘要:
Method for transmitting a radio signal between a moving electronics unit of a wheel and a fixed central electronic control unit of the vehicle, includes: defining an angular reference point of the wheel; defining a division of one wheel revolution into successive basic sectors, and transmitting successive radio signals between the two units so that each signal is transmitted at a calculated predetermined wheel angular position; calculating the angular rotation speed of the wheel; determining a minimum wheel rotation sector required for the transmission time of a signal between the two units, at the calculated angular rotation speed; determining an angular offset of transmission between a first and a second following signal, with respect to the angular reference point, as being equal to the smallest multiple of the basic division sector which covers the time required for transmission of the first radio signal at the calculated angular rotation speed.
摘要:
The present invention, in certain embodiments, is an apparatus to indicate the presence of an under-pressurized pneumatic tire for a vehicle, including, trailers, tractors, trucks or passenger vehicles. The apparatus comprises a housing, a cap, a shaft, a probe element, a bracket, an electrical switching element an electrically powered alarm. The housing is mounted next to the axle for the wheel of the vehicle. The cap is attached to the housing and has an aperture to receive the shaft. The shaft extends through the cap, and at one end, receives the probe element, and at the other end, holds the bracket upon which the electrical switching element is attached. When a tire loses air pressure, the height of the tire, as well as the vertical distance from the axle to the travelling surface, decreases; as the vertical distance decreases, the probe element contacts the travelling surface and rotates the shaft, bracket and electrical switch. The electrical switch and bracket contact a retaining element, which in certain embodiments is either part of the cap or part of the housing. The contact of the retaining element with the bracket prevents the electrical switch from being subjected to force in excess of what is necessary to activate the switch. When the electrical switch contacts the retaining element, at least one electrically powered alarm is activated thus notifying the operator of the vehicle of the deflated tire.
摘要:
A tire deflation monitoring system utilizes a device which attaches to the undercarriage of a vehicle adjacent each pneumatically inflated tire which is to be monitored. The device employs a component such as a wheel for rotationally contacting the road surface upon which the vehicle is disposed. When the road surface is contacted, the wheel is forced upwardly, causing contact to be made with an electrical switch that activates an indicator located in the driver's compartment of the vehicle.
摘要:
Method for transmitting a radio signal between a moving electronics unit of a wheel and a fixed central electronic control unit of the vehicle, includes: defining an angular reference point of the wheel; defining a division of one wheel revolution into successive basic sectors, and transmitting successive radio signals between the two units so that each signal is transmitted at a calculated predetermined wheel angular position; calculating the angular rotation speed of the wheel; determining a minimum wheel rotation sector required for the transmission time of a signal between the two units, at the calculated angular rotation speed; determining an angular offset of transmission between a first and a second following signal, with respect to the angular reference point, as being equal to the smallest multiple of the basic division sector which covers the time required for transmission of the first radio signal at the calculated angular rotation speed.
摘要:
A method for monitoring the pressure in a tire of a rolling vehicle includes determining the length of the tire contact patch of the tire in the driving direction and inferring the pressure in the tire from the length of the tire contact patch.