| 摘要 |
Some embodiments of the present invention provide a controller for a motor vehicle central tyre inflation system, the controller being configured to control the system to cause inflation and deflation of one or more tyres, the controller being configured to cause the system to operate in a selected one of a plurality of operating modes in each of which the system is configured to set a pressure of one or more tyres of the vehicle to a predetermined target tyre pressure value, wherein the operating modes include a leakage assist mode in which the controller causes the system to inflate the tyres to predetermined leakage assist pressure value and to attempt to maintain the tyre pressure at the predetermined leakage assist pressure value, the controller being configured automatically to cause the system to assume the leakage assist mode if it is determined that a tyre is suffering leakage, the controller being configured to determine that a tyre is suffering leakage in dependence at least in part on a first pressure signal indicative of the pressure of one or more tyres, wherein the system comprises at least one pressure sensor remote from the tyres for measuring pressure, wherein when the system determines that a tyre is suffering leakage according to the first pressure signal the system is configured to establish a gas flow path between the tyre and the remote pressure sensor and to measure a pressure of gas in the tyre by means of the remote pressure sensor by reference to a second pressure signal indicative of a pressure measured by the remote pressure sensor, wherein if the pressure of gas in the tyre according to the second pressure signal is sufficiently similar to the pressure of gas in the tyre according to the first pressure signal the system is configured to determine that the tyre is suffering leakage and to assume the leakage assist mode. |
