Vehicle braking technique evaluation apparatus

• US 5,207,095 A
• Filed: 10/11/1991
• Issued: 05/04/1993
• Est. Priority Date: 10/11/1991
• Status: Expired due to Fees

• Current Assignee: Liberty Mutual Insurance Company (Liberty Mutual Holding Company)
• Original Assignee: Liberty Mutual Insurance Company (Liberty Mutual Holding Company)
• Inventors: Hanson, William J., Teare, Peter R.
• Primary Examiner(s): MYRACLE, JERRY
• Application Number:
  US07/775,715
• Time in Patent Office: 571 Days
• Field of Search: 73/129, 73/121, 346/33 TP, 303/DIG. 1, 364/558
• US Class Current: 73/121
• CPC Class Codes: B60T 17/226 using devices being responsive to the difference between the fluid pressions in conduits of multiple braking systems

Abstract

A pneumatic or hydraulic pressure sensor is connected in parallel with the vehicle braking system and the sensor is connected to a computer system which periodically samples the sensor output. Other sensors can be used to detect other quantities such as engine speed, vehicle speed, wheel rotation or transmission speed, and other brake units and their outputs can also be periodically sampled. Under control of the computer, the samples are stored on a magnetic disk. The computer can then be instructed to interrogate the samples stored on the disk to produce charts of various quantities versus time which objectively indicate driver performance. The device can also be used to synchronize individual brake units in a multiple brake vehicle by simultaneously displaying the brake pressures in each brake unit, thereby enabling the relative application timing of the brake units to be measured.

Claims

1. Apparatus for measuring and quantifying a driver'"'"'s performance as a vehicle is being driven over a road, to be used in training a vehicle driver in proper braking techniques, the vehicle having a pressurized fluid braking system and a brake controllable by the vehicle driver for applying a pressure to said fluid for slowing and stopping the vehicle at appropriate locations in the road in response to predetermined road conditions, said training apparatus comprising:

means responsive to said pressure for generating a signal representing a magnitude of said pressure;

means for converting said signal into a plurality of digital words, each of said plurality of digital words representing the magnitude of said pressure at a point in time;

means responsive to said digital words for temporarily storing a group of said words representing magnitude values of said pressure over a predetermined interval of time; and

means responsive to said stored digital words for printing a graphical representation of said pressure over the predetermined period of time.

2. Vehicle braking technique evaluation apparatus according to claim 1 wherein said signal generating means comprises a pressure transducer.

3. Vehicle braking technique evaluation apparatus according to claim 1 wherein said converting means comprises a analog-to-digital converter for converting said signal into a plurality of digital words and means for sampling said digital words.

4. Vehicle braking technique evaluation apparatus according to claim 1 wherein said storing means comprises a disk drive having a disk therein on which digital information can be stored and a computer for controlling said disk drive to store said digital words on said disk drive.

5. Vehicle braking technique evaluation apparatus according to claim 1 wherein said printing means comprises a printer.

6. Vehicle braking technique evaluation apparatus for measuring driver performance as a vehicle is being driven through a test course, the vehicle having a pressurized fluid braking system and means for applying a pressure to said fluid for slowing and stopping the vehicle at appropriate locations in the course, said evaluation apparatus comprising:

a pressure transducer connected in parallel with said vehicle braking system and responsive to said pressure for generating a signal representing a magnitude of said pressure;

a analog-to-digital converter responsive to said signal for generating a plurality of digital words, each of said plurality of digital words representing the magnitude of said pressure at a point in time;

a magnetic disk storage responsive to said digital words for temporarily storing said words;

a computer for coordinating and controlling the transfer of words from said analog-to-digital converter to said disk storage; and

means responsive to said stored digital words for printing a graphical representation of said pressure over a predetermined period of time.

7. Vehicle braking technique evaluation apparatus according to claim 6 wherein said pressure transducer comprises a pneumatic pressure transducer.

8. Vehicle braking technique evaluation apparatus according to claim 6 wherein said pressure transducer comprises a hydraulic pressure transducer.

9. Vehicle braking technique evaluation apparatus according to claim 6 further comprising an adapter for connection in series with brake lines in said vehicle and means for connecting said pressure transducer to said adapter.

10. Vehicle braking technique evaluation apparatus according to claim 9 wherein said adapter has quick-disconnect fitting for connecting said adapter in series with said brake lines.

11. Apparatus for measuring brake synchronization in a multiple brake vehicle, the vehicle having a pressurized fluid braking system and means for applying a pressure to said fluid for actuating each of a plurality of individual brake units, said brake synchronization apparatus comprising:

means connected to said pressurized fluid braking system near said applying means for generating a first signal representing a magnitude of said pressure at said applying means;

means connected to said pressurized fluid braking system for generating a second plurality of signals, each of said second plurality of signals representing a magnitude of said pressure at one of said plurality of individual brake units;

means for converting said first signal into a first plurality of digital words, said first plurality of digital words representing the magnitude of said pressure at said applying means at different points in time over a predetermined period of time;

means for converting each of said second plurality of signals into a second plurality of digital words, said second plurality of digital words representing the magnitude of said pressure at each of said plurality of individual brake units at different points in time over said predetermined period of time

means responsive to said first plurality of digital words and said second plurality of digital words for temporarily storing said first plurality of digital words and said second plurality of digital words; and

means responsive to said stored digital words for printing a graphical representation of said pressure over a predetermined period of time, said graphical representation including separate traces representing the pressure at said applying means and at each of said plurality of individual brake units as a function of time.