US 4,381,555 A · Apparatus for measuring the braking time of a motor vehicle

Abstract

Apparatus is described for recording certain operating conditions of a motor vehicle, those conditions occurring upon the braking of the vehicle, and the apparatus is particularly applicable to vehicles equipped with antilock braking systems. A shift register is controlled by an oscillator in continuously shifting operation. When a predetermined driving condition occurs, the state of the first register location is changed. In the event the device is used for recording a braking condition, there is provided a time delay switch which locks the shift register at the point it has reached when a predetermined delay time is exceeded. The aforementioned shift register can be constructed in the form of an electromechanical shift register which responds to a signal generated through the operation of a stop lamp switch.

Claims8

Dependent claims

Apparatus for measuring the time elapsed between application of a vehicle brake and occurrence of a predetermined event, comprising:

a shift register having a number of register locations, each of which is capable of assuming one of two binary states and having a means for receiving shift pulses which cause the contents of a given register location to shift to the next succeeding register location upon application of each shift pulse,
oscillator means for supplying shift pulses to said means for receiving shift pulses in said shift register,
brake signal generator means connected to a signal input of said shift register for changing the binary state of a first location in said shift register upon application of the vehicle brake,
switch means operable responsive to a predetermined acceleration value experienced by said vehicle to disconnect said oscillator means from said means for receiving shift pulses, and
interrogation terminal means for determining the number of locations in said shift register containing bits of changed binary state for providing a measure of time elapsed between application of the vehicle brake and occurrence of the predetermined event.

2 more elements

Dependencies are inferred from the claim text.

Apparatus for measuring the braking time of a motor vehicle

Life of this patent

Apparatus for measuring the braking time of a motor vehicle

Life of this patent

Abstract

Claims8