Control system for the main control pressure of a motor vehicle automatic transmission

Claim 2

A control system for controlling the main control pressure of the automatic transmission of an internal combustion engine, comprising: a source of electric voltage; input transducer means (11) for converting mechanical position into electrical signals including a variable resistance, the ohmic value of which is controlled by the position of the engine throttle (62), said variable resistance (12) having a non-linear relation between resistance and throttle position, whereby said input transducer has a predetermined non-linear relation between input magnitude and output magnitude; amplifying evaluation circuit means (15) responsive to said input transducer means (11), and output transducer means (19) controlled by the electrical output of said evaluation circuit means (15) for mechanically controlling said main control pressure.

Claim 3

A control system for controlling the main control pressure of the automatic transmission of an internal combustion engine, comprising: a source of electric voltage; input transducer means (11) for converting mechanical position into electrical signals including a variable resistance, the ohmic value of which is controlled by the position of the engine throttle (62), said variable resistance (12) having a non-linear relation between resistance and throttle position, whereby said input transducer has a predetermined non-linear relation between input magnitude and output magnitude; amplifying evaluation circuit means (15) responsive to said input transducer means (11), and output transducer means (19) controlled by the electrical output of said evaluation circuit means (15) for mechanically controlling said main control pressure.

Claim 4

A control system for controlling the main control pressure of the automatic transmission of an internal combustion engine, comprising: a source of electric voltage; input transducer means (11) for converting mechanical position into electrical signals including a variable resistance, the ohmic value of which is controlled by the position of the engine throttle (62), said variable resistance (12) having a non-linear relation between resistance and throttle position, whereby said input transducer has a predetermined non-linear relation between input magnitude and output magnitude; amplifying evaluation circuit means (15) responsive to said input transducer means (11), and output transducer means (19) controlled by the electrical output of said evaluation circuit means (15) for mechanically controlling said main control pressure.

Claim 5

A control system for controlling the main control pressure of the automatic transmission of an internal combustion engine, comprising: a source of electric voltage; input transducer means (11) for converting mechanical position to electrical signals including a variable resistance, the ohmic value of which is controlled by the position of the engine Throttle (62), the relation of resistance to throttle position of said variable resistance (12) being such as to provide a predetermined non-linear relation of the overall characteristic of said input transducer (11), evaluation circuit means (15) and output transducer (19) (throttle position to mechanical position of said output transducer).

Claim 6

A control system for controlling the main control pressure of the automatic transmission of an internal combustion engine, comprising: a source of electric voltage; input transducer means (11) for converting mechanical position to electrical signals including a variable resistance, the ohmic value of which is controlled by the position of the engine Throttle (62), the relation of resistance to throttle position of said variable resistance (12) being such as to provide a predetermined non-linear relation of the overall characteristic of said input transducer (11), evaluation circuit means (15) and output transducer (19) (throttle position to mechanical position of said output transducer).

Claim 7

A control system for controlling the main control pressure of the automatic transmission of an internal combustion engine, comprising: a source of electric voltage; input transducer means (11) for converting mechanical position to electrical signals including at least an element (12) providing an electrical signal corresponding to engine throttle position; amplifying evaluation circuit means (15) responsive to said input transducer means (11) comprising non-linear switching elements (33, 36) such as to provide a prescribed non-linear dependence of the output of said evaluation circuit upon the position of said engine throttle, and output transducer means (19) controlled by the electrical output of said evaluation circuit means (15) for mechanically controlling said main control pressure.

Claim 8

A control system for controlling the main control pressure of the automatic transmission of an internal combustion engine, comprising: a source of electric voltage; input transducer means (11) for converting mechanical position to electrical signals including at least an element (12) providing an electrical signal corresponding to engine throttle position; amplifying evaluation circuit means (15) responsive to said input transducer means (11) comprising non-linear switching elements (33, 36) such as to provide a prescribed non-linear dependence of the output of said evaluation circuit upon the position of said engine throttle, and output transducer means (19) controlled by the electrical output of said evaluation circuit means (15) for mechanically controlling said main control pressure.

Claim 9

A control system for controlling the main control pressure of the automatic transmission of an internal combustion engine, comprising: a source of electric voltage; input transducer means (11) for converting mechanical position to electrical signals including at least an element (12) providing an electrical signal corresponding to engine throttle position; amplifying evaluation circuit means (15) responsive to said input transducer means (11), and output transducer means (19), controlled by the electrical output of said evaluation circuit means (15) for mechanically controlling said main control pressure and comprising a transducer element with a non-linear operating characteristic relation between input power and transducer mechanical position, such as to provide a predetermined non-linear dependence of output transducer mechanical position upon the position of said engine throttle.

Claim 10

A control system for controlling the main control pressure of the automatic transmission of an internal combustion engine, comprising: a source of electric voltage; input transducer means (11) for converting mechanical position to electrical signals including at least an element (12) providing an electrical signal corresponding to engine throttle position; amplifying evaluation circuit means (15) responsive to said input transducer means (11), and output transducer means (19), controlled by the electrical output of said evaluation circuit means (15) for mechanically controlling said main control pressure and comprising a transducer element with a non-linear operating characteristic relation between input power and transducer mechanical position, such as to provide a predetermined non-linear dependence of output transducer mechanical position upon the position of said engine throttle.

Claim 11

A control system for controlling the main control pressure of the automatic transmission of an internal combustion engine, comprising: a source of electric voltage; input transducer means (11) for converting mechanical position to electrical signals including at least an element (12) providing an electrical signal corresponding to engine throttle position; amplifying evaluation circuit means (15) responsive to said input transducer means (11) and provided with voltage stabilization means for reducing the range of variations in its supply voltage, said voltage stabilization means including a series resistor (24) and a first Zener diode (25) connected in parallel to the electrical load of said voltage stabilization means, and output transducer means (19) controlled by the electrical output of said evaluation circuit means (15) for mechanically controlling said main control pressure.

Claim 12

A control system for controlling the main control pressure of the automatic transmission of an internal combustion engine, comprising: a source of electric voltage; input transducer means (11) for converting mechanical position to electrical signals including at least an element (12) providing an electrical signal corresponding to engine throttle position; amplifying evaluation circuit means (15) responsive to said input transducer means (11) and provided with voltage stabilization means for reducing the range of variations in its supply voltage, said voltage stabilization means including a series resistor (24) and a first Zener diode (25) connected in parallel to the electrical load of said voltage stabilization means, and output transducer means (19) controlled by the electrical output of said evaluation circuit means (15) for mechanically controlling said main control pressure.

Claim 13

A control system as defined in claim 5 in which said evaluation circuit means (15) contains a regulating transistor (3) and an output transistor (36) and is provided with temperature stabilization means for reducing the effects of ambient temperature variations, comprising a first diode (26) connected in series with said first Zener (25) and a second diode (28) connected in parallel to the series combination of said first diode and said first Zener diode and, further, a resistor (45) connected between said base electrode of said regulating transistor (33) and the output of said voltage stabilization means (29), two resistor elements (41,42) in series in a feedback connection from the emitter electrode of said output transistor (36) to the base electrode of said regulating transistor (33) and a third diode connected between the common connection (43) of said two resistors (41,42) and said base electrode of said regulating transistor (33).

Claim 14

A control system as defined in claim 6 in which, for furtheR reduction of effects of temperature or source voltage variations, said output transistor (36) of said evaluation circuit means (15) is provided with an emitter resistor (38) and the base electrode of said output transistor (36) is connected over other circuit elements to the collector electrode of said regulating transistor (33).

Claim 15

A control system as defined in claim 5 in which said voltage stabilization means in said evaluation circuit means (15) includes a capacitor (27) connected across the output of said voltage stabilization means for reducing the effects of short-duration overvoltages.

Claim 16

A control system as defined in claim 5 in which said evaluation circuit means (15) includes an output transistor (36) and a second Zener diode (39) connected across the collector-emitter path of said output transistor (36) for mitigating effects of excessive supply voltage and/or off-switching transients of said output transducer (19).

Claim 17

A control system as defined in claim 5 in which said evaluation circuit means (15) contains an output transistor (36) and is provided with protection against reverse connection of the supply voltage comprising a second diode (28) connected across the output of said voltage stabilization means and also a second Zener diode (39) connected across the collector-emitter path of said output transistor (36).

Claim 18

A control system for controlling the main control pressure of the automatic transmission of an internal combustion engine, comprising: a source of electric voltage; input transducer means (11) for converting mechanical position to electrical signals including a variable resistance, the ohmic value of which is controlled by the position of the engine throttle (62); amplifying evaluation circuit means (15) responsive to said input transducer means (11), and output transducer means (19) controlled by the electrical output of said evaluation circuit means (15) for mechanically controlling said main control pressure, the resistance path of said variable resistance (12) being so connected to said evaluation circuit means (15) that upon interruption of one of the leads (31a, 31b, 61) of said variable resistance (12), said output transducer means (19) produces a maximum value of said control pressure.

Claim 19

A control system for controlling the main control pressure of the automatic transmission of an internal combustion engine, comprising: a source of electric voltage; input transducer means (11) for converting mechanical position to electrical signals including a variable resistance, the ohmic value of which is controlled by the position of the engine throttle (62); amplifying evaluation circuit means (15) responsive to said input transducer means (11), and output transducer means (19) controlled by the electrical output of said evaluation circuit means (15) for mechanically controlling said main control pressure, the resistance path of said variable resistance (12) being so connected to said evaluation circuit means (15) that upon interruption of one of the leads (31a, 31b, 61) of said variable resistance (12), said output transducer means (19) produces a maximum value of said control pressure.

Claim 20

A control system for controlling the main control pressure of the automatic transmission of an internal combustion engine, comprising: a source of electric voltage; input transducer means (11) for converting mechanical position to electrical signals including at least an element (12) providing an electrical signal corresponding to engine throttle position; amplifying evaluation circuit means (15) having a first input connected to said input transducer means (11) and having a second input (47) connected to a source of alternating voltage (51), and output transducer means (19) controlled by the electrical output of said evaluation circuit means (15) for mechanically controlling said main control pressure, an alternating motion being superimposed, as the result of said second input connection of said evaluation means, on the control motion of said output transducer means (19) to overcome the effect of friction hysteresis.

Claim 21

A control system for controlling the main control pressure of the automatic transmission of an internal combustion engine, comprising: a source of electric voltage; input transducer means (11) for converting mechanical position to electrical signals including at least an element (12) providing an electrical signal corresponding to engine throttle position; amplifying evaluation circuit means (15) having a first input connected to said input transducer means (11) and having a second input (47) connected to a source of alternating voltage (51), and output transducer means (19) controlled by the electrical output of said evaluation circuit means (15) for mechanically controlling said main control pressure, an alternating motion being superimposed, as the result of said second input connection of said evaluation means, on the control motion of said output transducer means (19) to overcome the effect of friction hysteresis.

Claim 22

A control system as defined in claim 12 in which said source of alternating voltage is the interruptor (51) of the ignition system of said internal combustion engine.

Claim 23

A control system as defined in claim 12 in which said evaluation circuit means (15) includes an output transistor and in which said second input of said evaluation circuit means (15) comprises a series combination of a capacitor (48) and a resistor (49) interposed between the base of said output transistor and said source of alternating current (51).

Claim 24

A control system for controlling the main control pressure of the automatic transmission of an internal combustion engine, comprising: a source of electric voltage; input transducer means (11) for converting mechanical position to electrical signals including at least an element (12) providing an electrical signal corresponding to engine throttle position; amplifying evaluation circuit means (15) responsive to said input transducer means (11) and having a plurality of inputs, said input transducer means including at least one means for producing an additional output supplied to one of said inputs of said evaluation circuit means, said means for producing an additional output being connectible to a device for response to the chemical composition of the exhaust gases of said internal combustion engine, and output transducer means (19) controlled by the electrical output of said evaluation circuit means (15) for mechanically controlling said main control pressure.

Claim 25

A control system for controlling the main control pressure of the automatic transmission of an internal combustion engine, comprising: a source of electric voltage; input transducer means (11) for converting mechanical position to electrical signals including at least an element (12) providing an electrical signal corresponding to engine throttle position; amplifying evaluation circuit means (15) responsive to said input transducer means (11) and having a plurality of inputs, said input transducer means including at least one means for producing an additional output supplied to one of said inputs of said evaluation circuit means, said means for producing an additional output being connectible to a device for response to the chemical composition of the exhaust gases of said internal combustion engine, and output transducer means (19) controlled by the electrical output of said evaluation circuit means (15) for mechanically controlling said main control pressure.

Claim 26

A control system as defined in claim 15 in which said evaluation circuit means includes a first additional input (52) and a second additional input (52) comprises a first switch (13), the position of which is responsive to the degree of retard of the ignition timing of said internal combustion engine, said second additional input (57) comprising a second switch (14), the position of which is arranged to be responsive to a device (67) provided for control of the amount of exhaust gas recycled in said internal combustion engine.

Claim 27

A control system for controlling the main control pressure of the automatic transmission of an internal combustion engine, comprising: input transducer means (11) for converting mechanical position to electrical signals including at least an element (12) providing an electrical signal corresponding to engine throttle position; amplifying evaluation circuit means (15) responsive to said input transducer means (11), and output transducer means (19) controlled by the electrical output of said evaluation circuit means (15) for mechanically controlling said main control pressure and comprising a magnetic valve (21) of which the core and/or armature is or are provided with oil balance apertures for reduction of operating time.

Claim 28

A control system for controlling the main control pressure of the automatic transmission of an internal combustion engine, comprising: input transducer means (11) for converting mechanical position to electrical signals including at least an element (12) providing an electrical signal corresponding to engine throttle position; amplifying evaluation circuit means (15) responsive to said input transducer means (11), and output transducer means (19) controlled by the electrical output of said evaluation circuit means (15) for mechanically controlling said main control pressure and comprising a magnetic valve (21) of which the core and/or armature is or are provided with oil balance apertures for reduction of operating time.