Automatic transmission effective for changing speed by brake pressure

Claim 2

In an automatic vehicle transmission system for carrying out speed change by application of brake pressure, hydraulic torque converter means (10) including an input shaft (11), a pump (12) operatively connected to and driven by said input shaft (11), and a turbine (13) driven by said pump (12), a gear transmission means (50) operatively connected to said turbine (13) to be driven thereby and including speed change gearing (51, 52, 54, 55, 57), frictional engaging means (30) operatively connected with said speed change gearing of said gear transmission means (50) for actuating said speed change gearing, oil pressure operation circuit means (FIGS. 2 and 26) having a speed change region determining valve means (1260, 2260) and, communicating with the latter valve means, a distribution valve means (1270, 1290, 2270, 2290) for distributing operational oil to said friction engaging means (30) for controlling the latter, a brake pressure detector means (340, 2350) for generating a pressure signal when brake pressure attains a value beyond a predetermined value, memorial means (A1540, B1640, 2320) operatively connected with said distribution valve means (1270, 1290, 2270, 2290) and said brake pressure detector means (340,2350) for responding to a signal generated by the latter to operate said distribution valve means (1270, 1290, 2270, 2290) to control said friction engaging means (30) to act on said gear transmission means (50) for effecting a speed change from a higher gear state into a lower gear state, and a time delay circuit means (1930) operatively connected with said detector means (340) for transmitting a signal therefrom after brake pressure has been applied beyond a given time period.

Claim 3

In an automatic vehicle transmission system for carrying out speed change by application of brake pressure, a hydraulic torque converter means (10) having an input shaft (11) and including a pump (12) connected to said input shaft (11) to be driven thereby, said converter means also including a turbine (13) driven by said pump (12), a gear transmission means (50) driven by said turbine (13) and including speed change gearing (51, 52, 54, 55, 57) and an output shaft (56), friction engaging means (30) operatively connected to said transmission means (50) for actuating thE speed change gearing thereof, an oil pressure operating circuit means (FIG. 2) having a speed change region determining valve means (1260) and, communicating therewith, a distribution valve means (1270, 1290), said latter valve means communicating with said friction engaging means (30) for distributing operation oil thereto to control actuation of the latter, plurality of computation circuit means (1310, 1410, 1420, 1430, 1440, 1450, 1460, 1320,1330, 1340, 1350,1360, 1370) operatively connected with said converter means (10) and said transmission means (50) for generating a plurality speed change signals for effecting speed change from a higher into a lower gear state and for generating a plurality of speed change signals for effecting speed change into a higher gear state when the slip ratio of the number of revolutions of said pump shaft (11) with respect to the number of revolutions of said turbine (13) is at a predetermined value and when the number of revolutions of said turbine (13) and the number of revolutions of said output shaft (56) of said transmission means (50) are at predetermined values, a first AND-circuit means (A1510, C1610) connected electrically to some of said computation circuit means for generating an output signal when a plural number of speed change signals for converting said gear transmission means (50) into a higher gear state are generated, OR-circuit means (A1530, B1630) electrically connected with others of said plurality of computation circuit means for generating an output signal when any one of a plural number of speed change signals for changing said gear transmission mechanism into a lower gear state are generated, second AND-circuit means (B1520, D1620) electrically connected with said OR-circuit means (A1530, B1630) for receiving signals therefrom, bistable memorial circuit means (A1540, B1640) connected electrically with said first AND-circuit means (A1510, C1610) and with said second AND-circuit means (B1520, D1620) for continuously eliminating output signals as said bistable memorial circuit means is activated into counter stable state by a signal introduced from said OR-circuit means through said second AND-circuit means and for maintaining output signals in the normal stable state by signals received from said first AND-circuit means, synchronous time retaining circuit means (1710) operatively connected with said memorial circuit means (A1540, B1640) for generating a synchronous time retaining signal for predetermined time from the time when the output signal is generated and extinguished by said memorial circuit means, said synchronous time retaining circuit means being electrically connected with said first and second AND-circuit means, a NOT-circuit means (1720) electrically connected to said synchronous time retaining circuit means (1710) for extinguishing output signals during the time when the synchronous time retaining signal from said time retaining circuit means is developed in the circuit from said synchronous time retaining means to said first and second AND-circuit means, gear position logic circuit means (1810) electrically connected with said memorial circuit means (A1540, B1640) and with said synchronous time retaining circuit means (1710) as well as with said first and second AND-circuit means for adding a lower gear position signal to said first AND-circuit means by generating a lower gear position signal when a signal is not introduced from said memorial circuit means and for generating a higher gear position when a signal is introduced from said memorial circuit means and for adding said higher gear position signal to second AND-circuit means when said higher gear position signal is introduced from said memorial circuit means, electrical actuator means (1280, 1300) operatively connected to said distribution valve means (1270, 1290) for operating the latter when the output signal from said memorial circuit means is added, and brake-pressure detector means (340) fOr generating a signal when brake pressure attains a valve beyond a predetermined pressure, said detector means (340) being electrically connected with said OR-circuit means so that when a signal is generated by said detector means said distribution valve means (1270, 1290) is operated to carry out a speed change from a higher gear state into a lower gear state.

Claim 4

In an automatic vehicle transmission system for carrying out speed change by application of brake pressure, a hydraulic torque converter means (10) having an input shaft (11) and including a pump (12) connected to said input shaft (11) to be driven thereby, said converter means also including a turbine (13) driven by said pump (12), a gear transmission means (50) driven by said turbine (13) and including speed change gearing (51, 52, 54, 55, 57) and an output shaft (56), friction engaging means (30) operatively connected to said transmission means (50) for actuating thE speed change gearing thereof, an oil pressure operating circuit means (FIG. 2) having a speed change region determining valve means (1260) and, communicating therewith, a distribution valve means (1270, 1290), said latter valve means communicating with said friction engaging means (30) for distributing operation oil thereto to control actuation of the latter, plurality of computation circuit means (1310, 1410, 1420, 1430, 1440, 1450, 1460, 1320,1330, 1340, 1350,1360, 1370) operatively connected with said converter means (10) and said transmission means (50) for generating a plurality speed change signals for effecting speed change from a higher into a lower gear state and for generating a plurality of speed change signals for effecting speed change into a higher gear state when the slip ratio of the number of revolutions of said pump shaft (11) with respect to the number of revolutions of said turbine (13) is at a predetermined value and when the number of revolutions of said turbine (13) and the number of revolutions of said output shaft (56) of said transmission means (50) are at predetermined values, a first AND-circuit means (A1510, C1610) connected electrically to some of said computation circuit means for generating an output signal when a plural number of speed change signals for converting said gear transmission means (50) into a higher gear state are generated, OR-circuit means (A1530, B1630) electrically connected with others of said plurality of computation circuit means for generating an output signal when any one of a plural number of speed change signals for changing said gear transmission mechanism into a lower gear state are generated, second AND-circuit means (B1520, D1620) electrically connected with said OR-circuit means (A1530, B1630) for receiving signals therefrom, bistable memorial circuit means (A1540, B1640) connected electrically with said first AND-circuit means (A1510, C1610) and with said second AND-circuit means (B1520, D1620) for continuously eliminating output signals as said bistable memorial circuit means is activated into counter stable state by a signal introduced from said OR-circuit means through said second AND-circuit means and for maintaining output signals in the normal stable state by signals received from said first AND-circuit means, synchronous time retaining circuit means (1710) operatively connected with said memorial circuit means (A1540, B1640) for generating a synchronous time retaining signal for predetermined time from the time when the output signal is generated and extinguished by said memorial circuit means, said synchronous time retaining circuit means being electrically connected with said first and second AND-circuit means, a NOT-circuit means (1720) electrically connected to said synchronous time retaining circuit means (1710) for extinguishing output signals during the time when the synchronous time retaining signal from said time retaining circuit means is developed in the circuit from said synchronous time retaining means to said first and second AND-circuit means, gear position logic circuit means (1810) electrically connected with said memorial circuit means (A1540, B1640) and with said synchronous time retaining circuit means (1710) as well as with said first and second AND-circuit means for adding a lower gear position signal to said first AND-circuit means by generating a lower gear position signal when a signal is not introduced from said memorial circuit means and for generating a higher gear position when a signal is introduced from said memorial circuit means and for adding said higher gear position signal to second AND-circuit means when said higher gear position signal is introduced from said memorial circuit means, electrical actuator means (1280, 1300) operatively connected to said distribution valve means (1270, 1290) for operating the latter when the output signal from said memorial circuit means is added, and brake-pressure detector means (340) fOr generating a signal when brake pressure attains a valve beyond a predetermined pressure, said detector means (340) being electrically connected with said OR-circuit means so that when a signal is generated by said detector means said distribution valve means (1270, 1290) is operated to carry out a speed change from a higher gear state into a lower gear state.

Claim 5

The combination of claim 2 and wherein a third AND-circuit means (E1910, F1920) is electrically connected with said OR-circuit means as well as with some of said computation circuit means and said detector means (340) for bringing about speed change from a higher gear state into a lower gear state by operation of said distribution valve means (1270, 1290) when the number of revolutions of said output shaft (56) is below a predetermined number of revolutions and is introduced to said third AND-circuit means (E1910, F1920) when the latter signal and a signal from said detector means are both added to said third AND-circuit means (E1910, F1920).

Claim 6

The combination of claim 2 and wherein a time delay circuit means (1930) is electrically connected with said detector means (340) for bringing about operation of said distribution valve means (1270, 1290) to provide a speed change from a higher gear state into a lower gear state only when a signal is generated from said detector means (340) for more than a predetermined time.

Claim 7

In an automatic vehicle transmission system for carrying out speed change by application of brake pressure, hydraulic torque converter means (10) including an input shaft (11), a pump (12) operatively connected to and driven by said input shaft (11), and a turbine (13) driven by said pump (12), a gear transmission means (50) operatively connected to said turbine (13) to be driven thereby and including speed change gearing (51, 52, 54, 55, 57), frictional engaging means (30) operatively connected with said speed change gearing of said gear transmission means (50) for actuating said speed change gearing, oil pressure operation circuit means (FIGS. 2 and 26) having a speed change region determining valve means (1260, 2260) and, communicating with the latter valve means, a distribution valve means (1270, 1290, 2270, 2290) for distributing operational oil to said friction engaging means (30) for controlling the latter, a brake pressure detector means (340,2350) for generating a pressure signal when brake pressure attains a value beyond a predetermined value, hydraulic memorial means (2320) operatively connected with said distribution valve means (1270, 1290, 2270, 2290) and said brake pressure detector means (340, 2350) for responding to a signal generated by the latter to operate said distribution valve means (1270, 1290, 2270, 2290) to control said friction engaging means (30) to act on said gear transmission means (50) for effecting a speed change from a higher gear state into a lower gear state.

Claim 8

In an automatic vehicle transmission system for carrying out speed change by application of brake pressure, hydraulic torque converter means (10) including an input shaft (11), a pump (12) operatively connected to and driven by said input shaft (11), and a turbine (13) driven by said pump (12), a gear transmission means (50) operatively connected to said turbine (13) to be driven thereby and including speed change gearing (51, 52, 54, 55, 57), frictional engaging means (30) operatively connected with said speed change gearing of said gear transmission means (50) for actuating said speed change gearing, oil pressure operation circuit means (FIGS. 2 and 26) having a speed change region determining valve means (1260, 2260) and, communicating with the latter valve means, a distribution valve means (1270, 1290, 2270, 2290) for distributing operational oil to said friction engaging means (30) for controlling the latter, a brake pressure detector means (340,2350) for generating a pressure signal when brake pressure attains a value beyond a predetermined value, hydraulic memorial means (2320) operatively connected with said distribution valve means (1270, 1290, 2270, 2290) and said brake pressure detector means (340, 2350) for responding to a signal generated by the latter to operate said distribution valve means (1270, 1290, 2270, 2290) to control said friction engaging means (30) to act on said gear transmission means (50) for effecting a speed change from a higher gear state into a lower gear state.

Claim 9

In an automatic vehicle transmission system for carrying out speed change by application of brake pressure, hydraulic torque converter means (10) including an input shaft (11), a pump (12) operatively connected to and driven by said input shaft (11), and a turbine (13) driven by said pump (12), a gear transmission means (50) operatively connected to said turbine (13) to be driven thereby and including speed change gearing (51, 52, 54, 55, 57), frictional engaging means (30) operatively connected with said speed change gearing of said gear transmission means (50) for actuating said speed change gearing, oil pressure operation circuit means (FIGS. 2 and 26) having a speed change region determining valve means (1260, 2260) and, communicating with the latter valve means, a distribution valve means (1270, 1290, 2270, 2290) for distributing operational oil to said friction engaging means (30) for controlling the latter, a brake pressure detector means (340, 2350) for generating a pressure signal when brake pressure attains a value beyond a predetermined value, and electrical memoriAl means (A1540, B1640) operatively connected with said distribution valve means (1270, 1290, 2270, 2290) and said brake pressure detector means (340, 2350) for responding to a signal generated by the latter to operate said distribution valve means (1270, 1290, 2270, 2290) to control said friction engaging means (30) to act on said gear transmission means (50) for effecting a speed change from a higher gear state into a lower gear state.

Claim 10

In an automatic vehicle transmission system for carrying out speed change by application of brake pressure, hydraulic torque converter means (10) including an input shaft (11), a pump (12) operatively connected to and driven by said input shaft (11), and a turbine (13) driven by said pump (12), a gear transmission means (50) operatively connected to said turbine (13) to be driven thereby and including speed change gearing (51, 52, 54, 55, 57), frictional engaging means (30) operatively connected with said speed change gearing of said gear transmission means (50) for actuating said speed change gearing, oil pressure operation circuit means (FIGS. 2 and 26) having a speed change region determining valve means (1260, 2260) and, communicating with the latter valve means, a distribution valve means (1270, 1290, 2270, 2290) for distributing operational oil to said friction engaging means (30) for controlling the latter, a brake pressure detector means (340, 2350) for generating a pressure signal when brake pressure attains a value beyond a predetermined value, and electrical memoriAl means (A1540, B1640) operatively connected with said distribution valve means (1270, 1290, 2270, 2290) and said brake pressure detector means (340, 2350) for responding to a signal generated by the latter to operate said distribution valve means (1270, 1290, 2270, 2290) to control said friction engaging means (30) to act on said gear transmission means (50) for effecting a speed change from a higher gear state into a lower gear state.