Electronic trip meter with an alarm for an automotive vehicle
First Claim
1. An electronic trip meter with an alarm for an automotive vehicle, comprising:
- (a) encoding means for producing a plurality of first signals which are indicative of sub distances along a course, and a second signal indicative of a total distance between a starting point and an objective point;
(b) travelled distance sensing means for producing a third signal in the form of a pulse train, the number of pulses of said third signal being indicative of a distance actually travelled by said vehicle;
(c) memory circuit for storing the sub distances represented by said first signals, each of said first signals being read out in turn in response to a reset signal applied thereto;
(d) modification circuit for producing an output signal indicative of a distance shorter than that represented by the read out signal derived from said memory circuit;
(e) first counting means for producing a fourth signal indicative of a distance travelled by said vehicle in accordance with said third signal;
(f) second counting means for producing a fifth signal indicative of the difference between said total distance and said distance travelled;
(g) first comparator for producing an output signal when the distance travelled exceeds said distance represented by the modification output signal;
(h) second comparator for producing an output signal when the distance travelled exceeds said distance represented by the memory circuit output signal, said output signal of said second comparator being utilized as said reset signal;
(i) a timer circuit responsive to said output signal of said first comparator for producing a signal for a predetermined period of time;
(j) an alarm responsive to the output signal of timer circuit;
(k) a subtractor for producing a sixth signal indicative of the difference between the distance represented by said fourth signal and the distance represented by the memory circuit output signal, said subtractor producing said sixth signal only when the first comparator output signal is applied thereto;
(l) a selection circuit for selectively transferring one of said fifth and sixth signals in response to the timer circuit output signal; and
(m) a display circuit for displaying a distance in accordance with the selection circuit output signal.
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Accused Products
Abstract
An electronic trip meter with an alarm for an automotive vehicle comprises a travelled distance sensing circuit, a memory circuit, a modification circuit, comparators, an alarm, first and second counters, a subtractor, a display circuit, and other auxiliary circuits. A plurality of sub distances defined by guide points along a course and a total distance of the course are respectively preset in the memory circuit and the second counter. The second counter output signal indicates a distance remaining to the goal of the course for displaying the remaining distance. The modification circuit output signal indicates a distance shorter than a sub distance while the first counter output signal indicates a distance actually travelled. When the vehicle travells over the distance shorter than the sub distance, the alarm is energized, by means of a comparison of the distances for informing the driver that a next guide point is near. Simultaneously, a distance remaining to the next guide point is displayed for a predetermined period of time.
19 Citations
12 Claims
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1. An electronic trip meter with an alarm for an automotive vehicle, comprising:
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(a) encoding means for producing a plurality of first signals which are indicative of sub distances along a course, and a second signal indicative of a total distance between a starting point and an objective point; (b) travelled distance sensing means for producing a third signal in the form of a pulse train, the number of pulses of said third signal being indicative of a distance actually travelled by said vehicle; (c) memory circuit for storing the sub distances represented by said first signals, each of said first signals being read out in turn in response to a reset signal applied thereto; (d) modification circuit for producing an output signal indicative of a distance shorter than that represented by the read out signal derived from said memory circuit; (e) first counting means for producing a fourth signal indicative of a distance travelled by said vehicle in accordance with said third signal; (f) second counting means for producing a fifth signal indicative of the difference between said total distance and said distance travelled; (g) first comparator for producing an output signal when the distance travelled exceeds said distance represented by the modification output signal; (h) second comparator for producing an output signal when the distance travelled exceeds said distance represented by the memory circuit output signal, said output signal of said second comparator being utilized as said reset signal; (i) a timer circuit responsive to said output signal of said first comparator for producing a signal for a predetermined period of time; (j) an alarm responsive to the output signal of timer circuit; (k) a subtractor for producing a sixth signal indicative of the difference between the distance represented by said fourth signal and the distance represented by the memory circuit output signal, said subtractor producing said sixth signal only when the first comparator output signal is applied thereto; (l) a selection circuit for selectively transferring one of said fifth and sixth signals in response to the timer circuit output signal; and (m) a display circuit for displaying a distance in accordance with the selection circuit output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An electronic trip meter with an alarm for an automotive vehicle comprising:
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means for setting a first preset distance and a second preset distance which is longer than said first preset distance; first means for producing a signal indicative of a modified distance which is shorter than said first preset distance; second means for producing a signal indicative of a distance travelled by the vehicle; third means responsive to said first and second means for producing an output signal when said distance travelled by said vehicle exceeds said modified distance; fourth means responsive to said output signal of said third means for producing an alarm signal; fifth means responsive to said first and second means for producing a signal indicative of the difference between said first preset distance and said distance travelled by said vehicle upon presence of said output signal of said third means; sixth means for displaying a distance corresponding to said difference obtained by said fifth means; means for permitting the transmission of said signal from said fifth means for a predetermined period of time when said output signal of said third means is fed thereto; and means for producing a signal indicative of the difference between said second preset distance and said distance travelled by said vehicle; said sixth means displaying a distance corresponding to said difference between said second preset distance and said distance travelled by said vehicle except for said predetermined period of time.
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Specification