Transmission clutch fluid pressure-indicating system

Claim 2

A monitoring circuit responsive to first and second varying fluid pressures to provide an indication of a condition wherein the first pressure reaches a first value at the same or nearly the same time as the second pressure reaches a second value, said circuit comprising power-supplying means, a first circuit path connected to said power-supplying means, a second circuit path connected to said power-supplying means, first pressureresponsive switch means having normally open contacts in one of said circuit paths and normally closed contacts in the other of said circuit paths, second pressure-responsive switch means having normally open contacts in one of said circuit paths and normally closed contacts in the other of said circuit paths, a third circuit path connected to said power-supplying means, first, second and third relays respectively having coils in said first, second and third circuit paths, a fourth circuit path connected to said power-supplying means, a readout device in said fourth circuit path, and first, second and third contacts in said fourth circuit path operable respectively in response to operation of said first, second and third relay coils to control said readout device, said first and second pressure-responsive switch means being adapted to switch in response to said certain pressure values and said contacts thereof being arranged so that operation of said third contacts in said fourth circuit path is effective to actuate said readout device only if all of the contacts of said first and second switch means in said first and second circuit paths have opened concurrently, thus indicating that said pressures have reached said certain values at the same time or within a time interval no greater than the transit time of one of said switch means.

Claim 3

The monitoring circuit as claimed in claim 1 in which said normally open contacts of said first and second switch means are in the same circuit path and said normally closed contacts of said first and second switch means are in the same circuit path, one of said pressures initially being sufficient to actuate one of said switch means to the nonnormal condition thereof and the other of said pressures initially being insufficient to actuate the other switch means to the nonnormal condition thereof, said one pressure normally decreasing and said other pressure normally increasing.

Claim 4

The monitoring circuit as claimed in claim 2 in which said first and second contacts in said fourth circuit path are respectively operated by fourth and fifth relay coils connected to said power supplying means which are in turn operated in conjunction with said first and second relays, said third contacts being operated by said third relay coil.

Claim 5

The monitoring circuit as claimed in claim 3 in which said readout device is an indicator lamp and including two additional indicator lamps operated in conjunction with said fourth and fifth relays respectively, to indicate conditions wherein said contacts of said first and second pressure-responsive switch means do not all open concurrently.

Claim 6

The monitoring circuit as claimed in claim 4 including contacts in circuit with said switches and operable with said third relay to interrupt power to said switches for preventing false operation after an initial signal.

Claim 7

A monitoring circuit responsive to first and second varying fluid pressures to provide an indication of a condition wherein tHe first pressure reaches a first value at substantially the same time as the second pressure reaches a second value, said circuit comprising power-supplying means, a first circuit path connected to said power-supplying means, a second circuit path connected to said power-supplying means, first pressure-responsive switch means having normally open contacts in said first circuit path and normally closed contacts in said second circuit path, second pressure-responsive switch means having normally open contacts in said first circuit path and normally closed contacts in said second circuit path, a third circuit path connected to said power-supplying means, first, second and third relays respectively having coils in said first, second and third circuit paths, a fourth circuit path connected to said power-supplying means, said third relay having contacts in said fourth circuit path, an indicator device in said fourth circuit path, fourth and fifth relays connected to said power-supplying means, further contacts in said fourth circuit path operated in response to said fourth and fifth relays, said first and second relays having contacts respectively in circuit with said fourth and fifth relays, said first and second pressure-responsive switch means being adapted to switch in response to said certain pressure values with said first switch means being normally actuated, whereby operation of said contacts of said third relay in said fourth circuit path is effective to actuate said indicator device only after all of the contacts of said first and second switch means in said first and second circuit paths have opened concurrently.

Claim 8

A monitoring circuit responsive to first and second varying fluid pressures to provide an indication of a condition wherein tHe first pressure reaches a first value at substantially the same time as the second pressure reaches a second value, said circuit comprising power-supplying means, a first circuit path connected to said power-supplying means, a second circuit path connected to said power-supplying means, first pressure-responsive switch means having normally open contacts in said first circuit path and normally closed contacts in said second circuit path, second pressure-responsive switch means having normally open contacts in said first circuit path and normally closed contacts in said second circuit path, a third circuit path connected to said power-supplying means, first, second and third relays respectively having coils in said first, second and third circuit paths, a fourth circuit path connected to said power-supplying means, said third relay having contacts in said fourth circuit path, an indicator device in said fourth circuit path, fourth and fifth relays connected to said power-supplying means, further contacts in said fourth circuit path operated in response to said fourth and fifth relays, said first and second relays having contacts respectively in circuit with said fourth and fifth relays, said first and second pressure-responsive switch means being adapted to switch in response to said certain pressure values with said first switch means being normally actuated, whereby operation of said contacts of said third relay in said fourth circuit path is effective to actuate said indicator device only after all of the contacts of said first and second switch means in said first and second circuit paths have opened concurrently.

Claim 9

A monitoring circuit responsive to first and second varying fluid pressures to provide an indication of a condition wherein the first pressure reaches a first value at substantially the same time as the second pressure reaches a second value, said circuit comprising power-supplying means, (1) first, second and third circuit paths connected to said power-supplying means, (2) first pressure-responsive switch means having normally open contacts in said first circuit path and normally closed contacts in said second and third circuit paths, (3) second pressure-responsive switch means having normally open contacts in said first circuit path and normally closed contacts in said second circuit path, (4) first, second and third relays respectively having coils in said first, second and third circuit paths, (5) a fourth circuit path connected to said power-supplying means, said third relay having contacts in said fourth circuit path, (6) a first indicator device in said fourth circuit path, (7) fourth and fifth relays connected to said power-supplying means and each having contacts in said fourth circuit path, (8) said first and second relays having contacts respectively in circuit with said fourth and fifth relay, (9) said first and second pressure-responsive switch means being adapted to switch in response to said certain pressure values with said first switch means being normally actuated, whereby closing of said contacts of said third relay in said fourth circuit path is effective to actuate said first indicator device only after all of the contacts of said first and second switch means in said first, second and third circuit paths have opened concurrently, and second and third indicator devices connected to said power-supplying means, said first and second relays having contacts respectively in circuit with said second and third indicator devices for operating the same selectively when said first and second switch means do not switch concurrently.

Claim 10

A monitoring circuit responsive to first and second varying fluid pressures to provide an indication of a condition wherein the first pressure reaches a first value at substantially the same time as the second pressure reaches a second value, said circuit comprising power-supplying means, (1) first, second and third circuit paths connected to said power-supplying means, (2) first pressure-responsive switch means having normally open contacts in said first circuit path and normally closed contacts in said second and third circuit paths, (3) second pressure-responsive switch means having normally open contacts in said first circuit path and normally closed contacts in said second circuit path, (4) first, second and third relays respectively having coils in said first, second and third circuit paths, (5) a fourth circuit path connected to said power-supplying means, said third relay having contacts in said fourth circuit path, (6) a first indicator device in said fourth circuit path, (7) fourth and fifth relays connected to said power-supplying means and each having contacts in said fourth circuit path, (8) said first and second relays having contacts respectively in circuit with said fourth and fifth relay, (9) said first and second pressure-responsive switch means being adapted to switch in response to said certain pressure values with said first switch means being normally actuated, whereby closing of said contacts of said third relay in said fourth circuit path is effective to actuate said first indicator device only after all of the contacts of said first and second switch means in said first, second and third circuit paths have opened concurrently, and second and third indicator devices connected to said power-supplying means, said first and second relays having contacts respectively in circuit with said second and third indicator devices for operating the same selectively when said first and second switch means do not switch concurrently.

Claim 11

A monitoring circuit for monitoring fluid pressures in the hydraulic circuits of two clutches of a transmission being shifted to provide an indication of a condition wherein one of said pressures decreases to a first value at the same or nearly the same time as the other pressure increases to a second value, said circuit comprising (1) power-supplying means, (2) first and second control circuit paths connected to said power-supplying means, (3) first pressure-responsive switch means having normally open contacts in one of said circuit paths and normally closed contacts in the other of said circuit paths, (4) second pressure-responsive switch means having normally open contacts in one of said circuit paths and normally closed contacts in the other of said circuit paths, (5) an indicator connected to said power-supplying means, and (6) a third control circuit path connected to said power-supplying means, (7) relay means in said third control circuit path having contacts in circuit with said indicator for actuating the same, (8) control means including control relay means in said first and second control circuit paths, (9) further contacts in circuit with said indicator and operable in conjunction with said control relay means, said first and second pressure-responsive switch means being adapted to switch in response to said first and second values, and said contacts being arranged so that said indicator is actuated only if all of the contacts of said first and second switch means in said first and second circuit paths have opened concurrently.

Claim 12

A monitoring circuit for monitoring fluid pressures in the hydraulic circuits of two clutches of a transmission being shifted to provide an indication of a condition wherein one of said pressures decreases to a first value at the same or nearly the same time as the other pressure increases to a second value, said circuit comprising (1) power-supplying means, (2) first and second control circuit paths connected to said power-supplying means, (3) first pressure-responsive switch means having normally open contacts in one of said circuit paths and normally closed contacts in the other of said circuit paths, (4) second pressure-responsive switch means having normally open contacts in one of said circuit paths and normally closed contacts in the other of said circuit paths, (5) an indicator connected to said power-supplying means, and (6) a third control circuit path connected to said power-supplying means, (7) relay means in said third control circuit path having contacts in circuit with said indicator for actuating the same, (8) control means including control relay means in said first and second control circuit paths, (9) further contacts in circuit with said indicator and operable in conjunction with said control relay means, said first and second pressure-responsive switch means being adapted to switch in response to said first and second values, and said contacts being arranged so that said indicator is actuated only if all of the contacts of said first and second switch means in said first and second circuit paths have opened concurrently.

Claim 13

A monitoring circuit for monitoring fluid pressures in the hydraulic circuit of two clutches of a transmission being shifted to provide an indication of a condition wherein one of said pressures decreases to a first value at the same or nearly the same time as the other pressure increases to a second value, said circuit comprising (1) power-supplying means, (2) first, second and third control circuit paths connected to said power-supplying means, (3) first pressure-responsive switch means having normally open contacts in one of said circuit paths and normally closed contacts in the others of said circuit paths, (4) second pressure-responsive switch means having normally open contacts in one of said circuit paths and normally closed contacts in another of said circuit paths (5) an indicator connected to said power-supplying means, and (6) relay means in said third control circuit path having contacts in circuit with said indicator for actuating the same, and (7) control means including relay means in said first and second control circuit paths and contacts in circuit with said indicator, said first and second pressure-responsive switch means being adapted to switch in response to said first and second values, and said contacts being arranged so that said indicator is actuated only if all of the contacts of said first and second switch means in said first, second and third circuit paths have opened concurrently.

Claim 14

A monitoring circuit for monitoring fluid pressures in the hydraulic circuit of two clutches of a transmission being shifted to provide an indication of a condition wherein one of said pressures decreases to a first value at the same or nearly the same time as the other pressure increases to a second value, said circuit comprising (1) power-supplying means, (2) first, second and third control circuit paths connected to said power-supplying means, (3) first pressure-responsive switch means having normally open contacts in one of said circuit paths and normally closed contacts in the others of said circuit paths, (4) second pressure-responsive switch means having normally open contacts in one of said circuit paths and normally closed contacts in another of said circuit paths (5) an indicator connected to said power-supplying means, and (6) relay means in said third control circuit path having contacts in circuit with said indicator for actuating the same, and (7) control means including relay means in said first and second control circuit paths and contacts in circuit with said indicator, said first and second pressure-responsive switch means being adapted to switch in response to said first and second values, and said contacts being arranged so that said indicator is actuated only if all of the contacts of said first and second switch means in said first, second and third circuit paths have opened concurrently.