US3662625A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic transmission control system on automobiles
Assignee: Denso Corp
•
Filing: 1970-05-07
•
Granted: 1972-05-16
•
Expires: 1990-05-07
Abstract
Abstract An automatic transmission control system of automobiles, wherein the coupling of a gear of the multiposition shifting mechanism and a gear meshing therewith on the engine side is released when a speed change signal is sent out, thereby placing the gears in neutral for a predetermined time interval until the specified change gear is meshed by the fluid coupling with the engine side gear, so as to eliminate shocks otherwise experienced by the automobile at the time of gear shifting to prevent people on the automobile from feeling discomfort, as well as to reduce wear on the gear mesh clutches per car-mile.
Inventors
- 👤 Hisato Wakamatsu
- 👤 Akira Kitano
- 👤 Hisasi Kawai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:41
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/02; F16H61/0202; F16H61/0204; F16H61/0213; F16H61/04; F16H61/08; F16H2306/00; F16H2306/40; F16H2306/46; F16H2306/50; F16H61/68; F16H61/682
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
315 words
A control system for an automatic transmission having a plurality of gear shift mechanism clutches and being usable in a vehicle having a movable accelerator, comprising a wheel speed detector for generating an output signal having a variable frequency proportional to the speed of said vehicle, an AC-DC converter operatively connected to said wheel speed detector for converting said output signal into corresponding magnitudes of DC voltage, a throttle switch adapted to cooperate with said accelerator and having a plurality of Contacts successively operable in accordance with the amount of movement of said accelerator, a throttle circuit connected to said throttle switch for producing various values of output voltage in dependence upon the operation of said throttle switch contacts, a plurality of speed change signal generators each of which is connected to said converter and said throttle circuit for producing different speed change signals in accordance with respective predetermined transmission characteristics upon comparing the said DC voltage of said converter and the output voltage of said throttle circuit, a logic circuit connected to said speed change signal generators for producing an output in accordance with the state of speed, a memory connected to said logic circuit for memorizing the vehicle speed, means including an electromagnetic valve unit having a plurality of electromagnetic valves each with a respective solenoid for controlling a respective one of said gear shift mechanism clutches, and a drive circuit operatively connected to said solenoids, memory and logic circuit for causing any one but only one of the said solenoids to be operative at a time depending upon the said state of speed output and for preventing also the currently operating solenoid from operating only for a respective period of time, every time a speed change signal is produced from a corresponding one of said speed change signal generators to cause said transmission to be in neutral for that period of time.
Claim 2
Dependent Claim
315 words
A control system for an automatic transmission having a plurality of gear shift mechanism clutches and being usable in a vehicle having a movable accelerator, comprising a wheel speed detector for generating an output signal having a variable frequency proportional to the speed of said vehicle, an AC-DC converter operatively connected to said wheel speed detector for converting said output signal into corresponding magnitudes of DC voltage, a throttle switch adapted to cooperate with said accelerator and having a plurality of Contacts successively operable in accordance with the amount of movement of said accelerator, a throttle circuit connected to said throttle switch for producing various values of output voltage in dependence upon the operation of said throttle switch contacts, a plurality of speed change signal generators each of which is connected to said converter and said throttle circuit for producing different speed change signals in accordance with respective predetermined transmission characteristics upon comparing the said DC voltage of said converter and the output voltage of said throttle circuit, a logic circuit connected to said speed change signal generators for producing an output in accordance with the state of speed, a memory connected to said logic circuit for memorizing the vehicle speed, means including an electromagnetic valve unit having a plurality of electromagnetic valves each with a respective solenoid for controlling a respective one of said gear shift mechanism clutches, and a drive circuit operatively connected to said solenoids, memory and logic circuit for causing any one but only one of the said solenoids to be operative at a time depending upon the said state of speed output and for preventing also the currently operating solenoid from operating only for a respective period of time, every time a speed change signal is produced from a corresponding one of said speed change signal generators to cause said transmission to be in neutral for that period of time.
Claim 3
Dependent Claim
129 words
A system according to claim 1, wherein said drive circuit comprises: a power circuit having outputs respectively connected to said solenoids of said electromagnetic valve unit and performing switching action of an electric power supply from a power source to said solenoids, an AND circuit connected between said power circuit and said memory to control the operation of said power circuit in response to input signals from said memory, a controlled switch means connected to complete an output circuit of said AND circuit, and timer circuits connected to receive speed change signals from said logic circuit and having its outputs connected to said controlled switch means, thereby to operate said controlled switch means for a constant period every time said speed change signal is received from said logic circuit.
Claim 4
Dependent Claim
56 words
A system according to claim 2, wherein said AND circuit comprises a plurality of transistors having a respective collector-emitter circuits and respective bases, respective resistors connecting said collector-emitter circuits to said power circuit, and a plurality of sets of two diodes, said diode sets respectively connecting said bases to different combinations of outputs of said memory.
Claim 5
Dependent Claim
67 words
A system according to claim 2, wherein said timer circuits comprise transistors having respective bases and respective resistor and capacitor sets connecting said bases to corresponding input terminals of said drive circuit to receive said logic circuit outputs, and wherein said controlled switch means comprises transistor having a base connected to the collector of each of said timer circuits and a collector connected to said power circuit.
Claim 6
Dependent Claim
282 words
A control system for an automatic transmission having a plurality of gear shift mechanism clutches and being usable in a vehicle having a movable accelerator, comprising a wheel speed detector for generating an output signal having a variable frequency proportional to the speed of said vehicle, an AC-DC converter operatively connected to said wheel speed detector for converting said output signal into corresponding magnitudes of DC voltage, a throttle switch adapted to cooperate with said accelerator and having a plurality of contacts successively operable in accordance with the amount of movement of said accelerator, a throttle circuit connected to said throttle switch for producing various values of output voltage in dependence upon the operation of said throttle switch contActs, a plurality of speed change signal generators each of which is connected to said converter and said throttle circuit for producing different speed change signals in accordance with respective predetermined transmission characteristics upon comparing the said DC voltage of said converter and the output voltage of said throttle circuit, means including an electromagnetic valve unit having a plurality of electromagnetic valves each with a respective solenoid for controlling a respective one of said gear shift mechanism clutches, and means including a drive circuit operatively connected between said speed change signal generators and solenoids for causing all of said solenoids to be operative but only one at a time in dependence upon the relative values of the signal generator outputs and for preventing operation of the currently operating solenoid for a respective period of time every time a speed change signal is produced from a corresponding one of said signal generators to cause said transmission to be in neutral for that period of time.
Claim 7
Dependent Claim
282 words
A control system for an automatic transmission having a plurality of gear shift mechanism clutches and being usable in a vehicle having a movable accelerator, comprising a wheel speed detector for generating an output signal having a variable frequency proportional to the speed of said vehicle, an AC-DC converter operatively connected to said wheel speed detector for converting said output signal into corresponding magnitudes of DC voltage, a throttle switch adapted to cooperate with said accelerator and having a plurality of contacts successively operable in accordance with the amount of movement of said accelerator, a throttle circuit connected to said throttle switch for producing various values of output voltage in dependence upon the operation of said throttle switch contActs, a plurality of speed change signal generators each of which is connected to said converter and said throttle circuit for producing different speed change signals in accordance with respective predetermined transmission characteristics upon comparing the said DC voltage of said converter and the output voltage of said throttle circuit, means including an electromagnetic valve unit having a plurality of electromagnetic valves each with a respective solenoid for controlling a respective one of said gear shift mechanism clutches, and means including a drive circuit operatively connected between said speed change signal generators and solenoids for causing all of said solenoids to be operative but only one at a time in dependence upon the relative values of the signal generator outputs and for preventing operation of the currently operating solenoid for a respective period of time every time a speed change signal is produced from a corresponding one of said signal generators to cause said transmission to be in neutral for that period of time.
References Cited (Backward Citations)
US3068715A
Cited
US3122940A
Cited
US3267762A
Cited
US3433101A
Cited
US3448640A
Cited
US3478851A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |