초록 ▼

A check valve, for use in a vacuum accumulator. The check valve includes a movable gate, which blocks fluid flow. The gate carries a first electrical contact, which mates with a second electrical contact, when the gate closes, thereby issuing a signal which indicates closure. The invention eliminate

A check valve, for use in a vacuum accumulator. The check valve includes a movable gate, which blocks fluid flow. The gate carries a first electrical contact, which mates with a second electrical contact, when the gate closes, thereby issuing a signal which indicates closure. The invention eliminates the need for a separate pressure sensor, for sensing pressure within the accumulator.

대표청구항 ▼

In the operation of a vacuum boost system in a vehicle, wherein a vacuum pump draws vacuum in an accumulator, and a check valve maintains the vacuum, the improvement comprising: a) detecting opening of the check valve; b) running the pump for a predetermined time after the opening; c) waiting for a

In the operation of a vacuum boost system in a vehicle, wherein a vacuum pump draws vacuum in an accumulator, and a check valve maintains the vacuum, the improvement comprising: a) detecting opening of the check valve; b) running the pump for a predetermined time after the opening; c) waiting for a time delay after step 1b); and then d) examining whether the check valve has closed, and i) if so, terminating running of the pump,. ii) if not, repeating step (b).