Method of measuring vehicle speed
First Claim
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1. A method of measuring vehicle speed comprising the steps of:
- (a) determining an initial vehicle speed;
(b) receiving a plurality of vehicle speed signal inputs;
(c) generating pulses corresponding to said vehicle speed signal inputs;
(d) counting the number of pulses generated during a predetermined time interval;
(e) calculating vehicle speed based on said number of counted pulses generated during said predetermined time interval;
wherein said initial vehicle speed determining step includes the steps of;
(i) receiving a first vehicle speed signal pulse after a vehicle speed measurement power supply has been turned on;
(ii) generating a second vehicle speed signal pulse having a period corresponding to said first vehicle speed signal pulse;
(iii) measuring the period of said generated pulse;
(iv) predicting a number of pulses, which will be generated during said predetermined time interval corresponding to said first and second vehicle speed signal pulses, based upon the measured period;
(v) determining said initial vehicle speed based on said predicted number of pulses.
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Abstract
In a method for measuring vehicle speed, initial vehicle speed measurement after a vehicle speed measurement power supply is turned on, is based on the predicted number of pulses to occur during a time interim which is in turn based on a period of a single pulse generated by a vehicle speed signal. After a predetermined time interval has passed, vehicle speed measurement is based on the actual number of pulses generated by vehicle speed signals during that time interval.
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2 Claims
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1. A method of measuring vehicle speed comprising the steps of:
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(a) determining an initial vehicle speed; (b) receiving a plurality of vehicle speed signal inputs; (c) generating pulses corresponding to said vehicle speed signal inputs; (d) counting the number of pulses generated during a predetermined time interval; (e) calculating vehicle speed based on said number of counted pulses generated during said predetermined time interval; wherein said initial vehicle speed determining step includes the steps of; (i) receiving a first vehicle speed signal pulse after a vehicle speed measurement power supply has been turned on; (ii) generating a second vehicle speed signal pulse having a period corresponding to said first vehicle speed signal pulse; (iii) measuring the period of said generated pulse; (iv) predicting a number of pulses, which will be generated during said predetermined time interval corresponding to said first and second vehicle speed signal pulses, based upon the measured period; (v) determining said initial vehicle speed based on said predicted number of pulses. - View Dependent Claims (2)
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Specification
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Current AssigneeBosch Braking Systems Corporation (Robert Bosch GmbH)
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Original AssigneeJidosha Kiki Co., Ltd.
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InventorsIshizaka, Kouichi
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Primary Examiner(s)Gruber, Felix D.
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Application NumberUS07/210,816Time in Patent Office711 DaysField of Search364/565, 364/566, 364/551, 364/569, 364/178, 364/431.07, 324/166, 324/168, 324/172US Class Current702/142CPC Class CodesB62D 6/02 responsive only to vehicle ...G01P 3/489 Digital circuits therefor
