Method and system for detecting the speed of a bicycle
AssigneeRaicam Driveline S.R.L.
InventorsMatteo Salviani, Benjamin Chetwood Struve', Andrea Canestrari
Life of this patent
Estimating the term…
Abstract
A method for detecting the speed of a bicycle, where the bicycle is equipped with an ABS system on the front wheel, in which, if the rear wheel deceleration is less than a preset threshold value, then the speed of the bicycle is identified with the rear wheel speed. If the front brake circuit pressure is below a preset low pressure threshold, then the speed of the bicycle is identified with the front wheel speed. Otherwise the speed of the bicycle is an estimated speed based on the last known speed and likely deceleration.
Claims13
A method for detecting speed of a bicycle, wherein the bicycle is equipped with an ABS system on a front wheel, the method comprising the steps of:
- a) obtaining, from a first rotating speed sensor on the front wheel, a front wheel speed;
- b) obtaining, from a second rotating speed sensor on a rear wheel, a rear wheel speed;
- c) obtaining, from a pressure transducer in a front brake hydraulic circuit, a front brake circuit pressure;
- d) calculating a rear wheel deceleration;
- e) if the rear wheel deceleration is less than a preset deceleration threshold value, then the speed of the bicycle is identified with the rear wheel speed, otherwise:
- f) if the front brake circuit pressure is below a preset low pressure threshold, then the speed of the bicycle is identified with the front wheel speed, otherwise
- g) the speed of the bicycle is an estimated speed calculated according to the following sub-steps:
- i) loading the front wheel speed in a memory buffer;
- ii) when the memory buffer is filled, calculating a front wheel mean speed and a front wheel deceleration;
- iii) if the front wheel deceleration value is within a preset deceleration threshold, the speed of the bicycle is estimated as a last calculated front wheel mean speed value, and the front wheel mean speed and front wheel deceleration values are stored;
- iv) if the front wheel deceleration value exceeds the preset deceleration threshold, the speed of the bicycle is estimated as a difference between the stored front wheel mean speed value and the stored front wheel deceleration value multiplied by an elapsed time since the front wheel mean speed and front wheel deceleration values were stored in sub-step iii).
A system for detecting a speed of a bicycle, where the bicycle is equipped with an ABS system on the front wheel, the system comprising:
- a first rotating speed sensor for detecting a front wheel speed;
- a second rotating speed sensor on a rear wheel for detecting a rear wheel speed;
- a pressure transducer for detecting a front brake circuit pressure in a front brake hydraulic circuit;
- an electronic control unit operatively coupled to said first rotating speed sensor, said second rotating speed sensor and said pressure transducer and configured for implementing a method for detecting the speed of a bicycle comprising:
- a) obtaining, from said first rotating speed sensor on said front wheel, the front wheel speed;
- b) obtaining, from said second rotating speed sensor on said rear wheel, the rear wheel speed;
- c) obtaining, from said pressure transducer in said front brake hydraulic circuit, the front brake circuit pressure;
- d) calculating a rear wheel deceleration;
- e) if the rear wheel deceleration is less than a preset deceleration threshold value, then the speed of the bicycle is identified with the rear wheel speed, otherwise:
- f) if the front brake circuit pressure is below a preset low pressure threshold, then the speed of the bicycle is identified with the front wheel speed, otherwise
- g) the speed of the bicycle is an estimated speed calculated according to the following sub-steps:
- i) loading the front wheel speed in a memory buffer;
- ii) when the memory buffer is filled, calculating a front wheel mean speed and a front wheel deceleration;
- iii) if the front wheel deceleration value is within a preset deceleration threshold, the speed of the bicycle is estimated as a last calculated front wheel mean speed value, and the front wheel mean speed and front wheel deceleration values are stored;
- iv) if the front wheel deceleration value exceeds the preset deceleration threshold, the speed of the bicycle is estimated as a difference between the stored front wheel mean speed value and the stored front wheel deceleration value multiplied by an elapsed time since the front wheel mean speed and front wheel deceleration values were stored in sub-step iii).
Dependencies are inferred from the claim text.