US3709565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and arrangement for electronic control of the braking means of wheeled vehicles
Assignee: Saab AB
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Filing: 1970-10-26
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Granted: 1973-01-09
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Expires: 1990-10-26
Abstract
Abstract In a motor car or other wheeled vehicle provided with electronically controlled wheel brakes, the lag or slip of the individual wheels is determined to render possible a control such that locking and skidding of the wheels is prevented. During braking, the brake of one wheel of the vehicle is intermittently released so that the wheel is intermittently free-running without slip. The speed of the vehicle is continuously measured by an accelerometer of simple type and an integrator integrating the accelerometer output. The true speed of the vehicle is intermittently measured by a speed transducer associated with said wheel and having an output representative of true speed during the free-running interval of the wheel. The approximate continuous speed value is recurrently updated by the intermittent true speed signal so that the integrator output is proportional to the ratio of the speed of the vehicle to that of the wheel and is a quantity to control the brake of the wheel in dependence of the slip of the wheel by comparison with a permissible or tolerable slip limit value.
Inventors
- 👤 A Jonason
- 👤 G Granlund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:08
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/176; B60T8/1761; B60T8/17613; B60T8/1701; B60T8/1703; B60T8/172; B60T8/32; B60T8/321; B60T8/3235; B60T8/324; B60T8/72
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
212 words
A method of indicating in an electronic system controlling the brake means of a wheeled vehicle the slip of a wheel of the vehicle during braking and of controlling the braking effect of the wheel in dependence on said indication to prevent locking of the wheel, which comprises supplying information o the instantaneous speeds of said vehicle wheel, in the of of electrical magnitudes, to a block included in an electronic unit comprising an analogue gate and an integrator, integrating the electrical signal representing the speed of the vehicle during the interval between two pulse edges of pulses which represent the speed of the wheel, generating said pulses by a speed transducer in such manner that the input of the integrator corresponds to a voltage Ui K1V during an interval T K2/v, wherein V is the predicted speed of the vehicle, K1 and K2 are constants and v is the actual speed of the wheel, so that the output of the integrator corresponds to a voltage Uu KiK1K2V/v wherein Ki is a constant and wherein Uu is proportional to the ratio of the speed of the vehicle to that of the wheel and is a quantity to control the braking effect of the wheel in dependence on the slip of the wheel.
Claim 2
Independent Claim
212 words
A method of indicating in an electronic system controlling the brake means of a wheeled vehicle the slip of a wheel of the vehicle during braking and of controlling the braking effect of the wheel in dependence on said indication to prevent locking of the wheel, which comprises supplying information o the instantaneous speeds of said vehicle wheel, in the of of electrical magnitudes, to a block included in an electronic unit comprising an analogue gate and an integrator, integrating the electrical signal representing the speed of the vehicle during the interval between two pulse edges of pulses which represent the speed of the wheel, generating said pulses by a speed transducer in such manner that the input of the integrator corresponds to a voltage Ui K1V during an interval T K2/v, wherein V is the predicted speed of the vehicle, K1 and K2 are constants and v is the actual speed of the wheel, so that the output of the integrator corresponds to a voltage Uu KiK1K2V/v wherein Ki is a constant and wherein Uu is proportional to the ratio of the speed of the vehicle to that of the wheel and is a quantity to control the braking effect of the wheel in dependence on the slip of the wheel.
Claim 3
Dependent Claim
220 words
In an electronic system controlling the brake means of a wheeled vehicle, an arrangement indicating the slip of a wheel of the vehicle during braking to control the braking effect of the wheel in dependence on the slip of said wheel whereby locking of the wheel is prevented, said arrangement comprising a block forming part of an electronic unit which block includes an analogue gate and an integrator adapted to operate during intervals conditionally controlled by said analogue gate to integrate an input representing the predicted vehicle speed during the interval between two pulse edges of pulses representing the speed of the wheel; a speed transducer generating said pulses and feeding them to the analogue gate, the input of the integrator being a voltage Ui K1V during an interval T K2/v, wherein V is the predicted speed of the vehicle, v is the speed of the appropriate wheel and K1 and K2 are constants, so that the integrator output becomes a voltage Uu KiK1K2V/v, wherein Ki is a constant and the output Uu is proportional to the ratio of the speed of the vehicle to that of the wheel, this ratio having a digital numerator and an analogue denominator and being a quantity which is dependent on the slip of the wheel and controls the braking effect of the wheel.
Claim 4
Dependent Claim
220 words
In an electronic system controlling the brake means of a wheeled vehicle, an arrangement indicating the slip of a wheel of the vehicle during braking to control the braking effect of the wheel in dependence on the slip of said wheel whereby locking of the wheel is prevented, said arrangement comprising a block forming part of an electronic unit which block includes an analogue gate and an integrator adapted to operate during intervals conditionally controlled by said analogue gate to integrate an input representing the predicted vehicle speed during the interval between two pulse edges of pulses representing the speed of the wheel; a speed transducer generating said pulses and feeding them to the analogue gate, the input of the integrator being a voltage Ui K1V during an interval T K2/v, wherein V is the predicted speed of the vehicle, v is the speed of the appropriate wheel and K1 and K2 are constants, so that the integrator output becomes a voltage Uu KiK1K2V/v, wherein Ki is a constant and the output Uu is proportional to the ratio of the speed of the vehicle to that of the wheel, this ratio having a digital numerator and an analogue denominator and being a quantity which is dependent on the slip of the wheel and controls the braking effect of the wheel.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |