US3885137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and system for constant-speed running of vehicles
Assignee: Aisin Corp
•
Filing: 1972-05-08
•
Granted: 1975-05-20
•
Expires: 1992-05-08
Abstract
Abstract For constantly adjusting the speed of a motor vehicle to a speed precedingly set by the vehicle driver, an electric signal responsive to the rotation of its wheels is continuously produced and is translated into pulses of desired characteristics. These pulses are counted under the control of separately produced signals to obtain a pulse number representing the set speed of the motor vehicle and pulse numbers respectively representing its actual speed at specified instants following the moment when the driver sets the vehicle speed. From these data a pulse number is computed which substantially represents the sum of a difference between the set speed and the actual speed and a rate of change in the actual speed. The pulse number of used for re-adjustment of the actual speed of the motor vehicle to the precedingly set speed. There are also disclosed herein some digitally operating systems based on this method.
Inventors
- 👤 Junichiro Ooya
- 👤 Naoji Sakakibara
- 👤 Yasuhiro Kawabata
- 👤 Hideo Nawa
- 👤 Takashi Hida
- 👤 Akira Tarao
- 👤 Korehiko Tsukuba
- 👤 Kazutaka Kuwana
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:37
CPC Classifications
B; B60; B60K; B60K31/00; B60K31/06; B60K31/10; B60K31/102; B60K31/105; B60K31/107
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
137 words
A method of constantly adjusting the speed of a motor vehicle to a set speed, which comprises sensing the rotational state of the wheels of the motor vehicle to provide an electric signal representative of its speed, translating said signal into pulses of desired characteristics, counting said pulses as dictated by control signals to obtain a pulse number representing a set speed of the motor vehicle and pulse numbers representing its actual speed at specified instants, said control signals being produced from clock pulses of a predetermined frequency, further counting a pulse number substantially representing the sum of a difference between the set speed and the actual speed of the motor vehicle and a rate of change in the actual speed, and adjusting the speed of the motor vehicle according to the pulse number representing the sum.
Claim 2
Independent Claim
137 words
A method of constantly adjusting the speed of a motor vehicle to a set speed, which comprises sensing the rotational state of the wheels of the motor vehicle to provide an electric signal representative of its speed, translating said signal into pulses of desired characteristics, counting said pulses as dictated by control signals to obtain a pulse number representing a set speed of the motor vehicle and pulse numbers representing its actual speed at specified instants, said control signals being produced from clock pulses of a predetermined frequency, further counting a pulse number substantially representing the sum of a difference between the set speed and the actual speed of the motor vehicle and a rate of change in the actual speed, and adjusting the speed of the motor vehicle according to the pulse number representing the sum.
Claim 3
Independent Claim
202 words
A system for constantly adjusting the speed of a motor vehicle to a set speed, comprising means for sensing the rotational state of the wheels of the motor vehicle, a shaping circuit for translating an output signal from said sensing means into pulses of desired characteristics, a control circuit for producing control signals from clock pulses of a predetermined frequency, manually operable means for setting a speed at which the motor vehicle is desired to run constantly, a counting circuit for counting the output pulses from said shaping circuit as dictated by said control signals to obtain a pulse number in binary notation which represents a set speed of the motor vehicle and pulse numbers representing its actual speed at specified instants and for further counting a pulse number in binary notation substantially representing the sum of a difference between the set speed and the actual speed of the motor vehicle and a rate of change in its actual speed, a decision circuit for deciding an operation required on the basis of the final pulse number obtained in said counting circuit, and operation controller means for adjusting the speed of the motor vehicle according to an output signal from said decision circuit.
Claim 4
Independent Claim
202 words
A system for constantly adjusting the speed of a motor vehicle to a set speed, comprising means for sensing the rotational state of the wheels of the motor vehicle, a shaping circuit for translating an output signal from said sensing means into pulses of desired characteristics, a control circuit for producing control signals from clock pulses of a predetermined frequency, manually operable means for setting a speed at which the motor vehicle is desired to run constantly, a counting circuit for counting the output pulses from said shaping circuit as dictated by said control signals to obtain a pulse number in binary notation which represents a set speed of the motor vehicle and pulse numbers representing its actual speed at specified instants and for further counting a pulse number in binary notation substantially representing the sum of a difference between the set speed and the actual speed of the motor vehicle and a rate of change in its actual speed, a decision circuit for deciding an operation required on the basis of the final pulse number obtained in said counting circuit, and operation controller means for adjusting the speed of the motor vehicle according to an output signal from said decision circuit.
Claim 5
Dependent Claim
20 words
The system according to claim 2, wherein said control circuit comprises a clock-pulse oscillator, a free-running counter, and a decoder.
Claim 6
Dependent Claim
139 words
The system according to claim 2, wherein said pulse number substantially representing the sum of a difference between the set speed and the actual speed of the motor vehicle and a rate of change in the actual speed is obtained by first counting the output pulses from said shaping circuit for a first specified time to obtain a first pulse number representing the set speed, by subtracting from said first pulse number a second pulse number obtained by counting said output pulses for another first specified time, by adding to the difference between the first and the second pulse number a third pulse number obtained by succeedingly counting said output pulses for a second specified time, and by subtracting from the sum a fourth pulse number obtained by further succeedingly counting said output pulses for another second specified time.
Claim 7
Dependent Claim
124 words
The system according to claim 2, wherein said pulse number substantially representing the sum of a difference between the set speed and the actual speed of the motor vehicle and a rate of change in the actual speed is obtained by first counting the output pulses from said shaping circuit for a first specified time to obtain a first pulse number representing the set speed, by adding to said first pulse number a second pulse number obtained by counting said output pulses for a second specified time, and by subtracting from the sum of said first and said second pulse number of a third pulse number obtained by succeedingly counting said output pulses for the sum of said first and said second specified time.
Claim 8
Dependent Claim
53 words
The system according to claim 2, wherein at least two cycles of computIng said pulse number substantially representing the sum of a difference between the set speed and the actual speed of the motor vehicle and a rate of change in the actual speed are carried out substantially simultaneously in said counting circuit.
Claim 9
Dependent Claim
25 words
The system according to claim 5, further comprising a circuit whereby at least one of said first and said second specified time is manually variable.
Claim 10
Dependent Claim
29 words
The system according to claim 2, further comprising means for manually varying the frequency of said clock pulses for fine adjustment of a set speed of the motor vehicle.
Claim 11
Dependent Claim
42 words
The system according to claim 2, further comprising a gate circuit connected between said shaping circuit and said counting circuit so as to be supplied with both the output pulses from said shaping circuit and a control signal from said control circuit.
Claim 12
Dependent Claim
43 words
The system according to claim 2, wherein said operation controller means comprises an accelerating electromagnetic valve, a decelerating electromagnetic valve, an adjusting electromagnetic valve, diaphragm means operated by said three electromagnetic valves, and an engine throttle valve operatively connected to said diaphragm means.
References Cited (Backward Citations)
US3580355A
Cited
US3455411A
Cited
US3570622A
Cited
US3575256A
Cited
US3715006A
Cited
US3599154A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |