Mobile perpetually self-correcting estimated time of arrival calculator

• US 4,153,874 A
• Filed: 08/26/1977
• Issued: 05/08/1979
• Est. Priority Date: 08/26/1977
• Status: Expired due to Term

• Current Assignee: Erwin A. Kaestner
• Original Assignee: Erwin A. Kaestner
• Inventors: Kaestner, Erwin A.
• Primary Examiner(s): Tokar, M.
• Application Number:
  US05/827,884
• Time in Patent Office: 620 Days
• Field of Search: 235/92 T, 235/92 CA, 235/91 H, 58/145 A, 58/152 E, 340/53, 340/56, 340/62, 340/263, 324/161, 324/166, 324/175
• US Class Current: 324/161
• CPC Class Codes: G01C 21/20 Instruments for performing navigational calculations G01C21/24, G01C21/26 take precedence

Abstract

A calculator for computing the estimated time of arrival of a vehicle or the like at a desired destination. The calculator, under control of a microprocessor and related interfacing devices, computes and periodically updates the estimated time of arrival at the destination from information reflecting present chronological time, the total estimated distance and the desired average speed to be travelled to the destination, and the actual distance travelled by the vehicle. The information resulting from the microprocessor'"'"'s computations is visually displayed together with the present chronological time. The calculator may also be provided with warning sensors to provide an indication when a predetermined maximum speed has been exceeded. In an alternate mode, the calculator may be caused to function as a standard four function calculator, without affecting data previously stored in the estimated time of arrival mode.

Claims

1. An estimated time of arrival calculator for computing the estimated time of arrival of a vehicle or the like at a desired destination from information reflecting the total estimated distance and the desired average speed to be travelled to the destination supplied by an operator and from information reflecting the present chronological time and the actual distance travelled by the vehicle, the calculator comprising:

(a) memory means having a plurality of storage locations for storing digital information;

(b) means for entering into said memory means the information reflecting the total estimated distance and the desired average speed to be travelled to the destination;

(c) clock means for generating information reflecting the present chronological time;

(d) calculating means responsive to said memory means and said clock means for computing the estimated time of arrival at the destination from information reflecting the total estimated distance to the destination, the desired average speed, the actual distance travelled and the present chronological time; and

(e) means responsive to said calculating means for displaying the estimated time of arrival.

2. The calculator according claim 1 including means for displaying the actual present chronological time.

3. The calculator according to claim 2 including means for setting said actual present chronological time display means to the actual chronological time.

4. The calculator according to claim 1 wherein said means for entering comprises a keyboard having numeric entry functions and control functions for entering information reflecting the total distance estimated to the destination and the desired average speed.

5. The calculator according to claim 1 including a transducer in association with the vehicle for supplying information reflecting the total distance travelled.

6. The calculator according to claim 1 wherein said calculating means includes:

(a) means for calculating the distance remaining to the destination from information reflecting the total estimated distance and from information reflecting the actual distance travelled;

(b) means for calculating a time to complete from the distance remaining and desired average speed; and

(c) means for calculating the estimated time of arrival from the time to complete and present chronological time.

7. The calculator according to claim 1 including means for entering information reflecting a desired maximum speed into said memory means, and means for providing an indication when the desired maximum speed has been exceeded by the vehicle.