VEHICLE OPENING DEVICE
A sensing arrangement for sensing a body part in a vehicle opening is described. The arrangement includes a flexible sealing member with two separate electrically conductive members. The two electrically conductive members are interconnected by an electrical oscillator which generates an electric field in the vehicle opening. The arrangement also includes detecting circuitry for detecting a change in the capacitance of the electric field when the body part is in the vicinity of the opening, and for detecting electrical continuity of the first and second electrically conductive members.
1 . A sensing arrangement for sensing a body part in a vehicle opening, the sensing arrangement comprising:
(a) a flexible sealing member adapted to be positioned adjacent to the opening;
(b) a first electrically conductive member within the flexible sealing member;
(c) a second electrically conductive member within the flexible sealing member, separate from the first electrically conductive member;
(d) an oscillator for supplying an oscillating signal to the first and second electrically conductive members to generate an electric field in the vicinity of the vehicle opening, and
(e) detection circuitry for detecting a change of capacitance of the first and second electrically conductive members due to presence of a the body part in the electric field, wherein at least part of the oscillator electrically interconnects the first and second electrically conductive members enabling electrical continuity of the first and second electrically conductive members to be tested.
2 . The sensing arrangement according to claim 1 , wherein the oscillator includes a supply voltage and a control voltage and operates as a voltage controlled oscillator and the detection circuitry includes a phase detector for comparing an output frequency of the oscillator with a reference frequency to generate the control voltage for the oscillator and processing means for detecting one of a change and an interruption of the supply voltage caused by a change of electrical continuity of the first and second electrically conductive members.
3 . The sensing arrangement according to claim 2 wherein the processing means includes means for comparing a value of the control voltage with the reference value to detect the one of the change and the interruption and a change of capacitance.
4 . The sensing arrangement according to claim 2 wherein the oscillator and the phase detector form a phase locked loop and the control voltage is supplied by the phase detector to a variable capacitance means via a low pass filter.
5 . The sensing arrangement according to claim 4 wherein the variable capacitance means is for tuning tunes the oscillator in response to the control voltage.
6 . The sensing arrangement according to claim 5 wherein the variable capacitance means is a varactor.
7 . The sensing arrangement according to claim 1 wherein the first and second electrically conductive members are differently shaped to concentrate the electric field in the vicinity of the opening.
8 . The sensing arrangement according to claim 1 wherein the first and second electrically conductive members are made of electrically conductive rubber.
9 . The sensing arrangement according to claim 1 wherein each of the first and second electrically conductive members includes an embedded electrical conductor.
10 . The sensing arrangement according to claim 9 wherein the electrical conductor is a wire.
11 . The sensing arrangement according to claim 1 wherein the flexible sealing member includes one of an electrically insulating rubber and an electrically insulating plastic.
12 . The sensing arrangement according to claim 1 wherein the first and second electrically conductive members are separated by a hollow chamber.
13 . The sensing arrangement according to claim 1 wherein the vehicle opening is a window opening including a motor driven window glass and the detection circuitry is arranged to at least one of halt and reverse upward movement of the window glass in response to at least one of a detected change of capacitance and a change of electrical continuity.
14 . The sensing arrangement according to claim 1 , further comprising one of a sealing strip and a guiding strip.
15 . (canceled)
16 . (canceled)
17 . A sensing arrangement for sensing a body part in a vehicle opening, the sensing arrangement comprising:
(a) a flexible sealing member adapted to be positioned adjacent to the opening;
(b) a first electrically conductive member within the flexible sealing member;
(c) a second electrically conductive member within the flexible sealing member, the second electrically conductive member being spaced from the first electrically conductive member;
(d) an oscillator for supplying an oscillating signal to the first and second electrically conductive members to generate an electric field in the vicinity of the vehicle opening, a first side of the oscillator being connected to the first electrically conductive member and a second side of the oscillator being connected to second electrically conductive member, the connection of the oscillator to the first and the second electrically conductive members enabling testing of an electrical continuity of the first and the second electrically conductive members; and
(e) detection circuitry for detecting a change of capacitance of the first and second electrically conductive members due to presence of a the body part in the electric field.
18 . The sensing arrangement according to claim 17 wherein the lack of electrical continuity of the first and the second electrically conductive members changes a supply voltage to the oscillator.