Speed-deceleration warning system for motor vehicles
First Claim
1. A braking deceleration warning system for a motor vehicle having braking means actuated by fluid under pressure, the warning system comprising:
- means for sensing a predetermined braking fluid pressure;
means for sensing a predetermined deceleration of the motor vehicle resulting from the application of said predetermined braking fluid pressure;
a device for warning an operator of the vehicle of abnormal vehicle deceleration when the brakes are applied; and
means responsive to the braking fluid pressure sensing means and to the vehicle deceleration sensing means for actuating the warning device if, and only if, the applied pressure of the braking fluid at least equals said predetermined pressure that is normally effective to produce said predetermined deceleration of the vehicle, and the resulting deceleration is less than a predetermined normal rate of speed decrease corresponding to the applied braking fluid pressure.
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Accused Products
Abstract
A speed-deceleration warning system for motor vehicles comprising pressured-oil supply means connected to a master cylinder of a brake mechanism, a hydraulic switch including a first contact moved by the action of pressured-oil, a speed-deceleration switch including a second contact moved by the influence of speed reduction of a vehicle and an electric circuit extending to a warning element through said first and second contacts. Such a device is applied for sending a warning to a driver if speed-deceleration of a vehicle does not reach an expected value although brake means are set on and hydraulic brake pressure rises over a prescribed value.
15 Citations
11 Claims
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1. A braking deceleration warning system for a motor vehicle having braking means actuated by fluid under pressure, the warning system comprising:
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means for sensing a predetermined braking fluid pressure; means for sensing a predetermined deceleration of the motor vehicle resulting from the application of said predetermined braking fluid pressure; a device for warning an operator of the vehicle of abnormal vehicle deceleration when the brakes are applied; and means responsive to the braking fluid pressure sensing means and to the vehicle deceleration sensing means for actuating the warning device if, and only if, the applied pressure of the braking fluid at least equals said predetermined pressure that is normally effective to produce said predetermined deceleration of the vehicle, and the resulting deceleration is less than a predetermined normal rate of speed decrease corresponding to the applied braking fluid pressure.
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2. A braking deceleration warning system for installation in a motor vehicle having a source of electrical power and braking means actuated by fluid under pressure, the warning system comprising:
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an electrically actuated device adapted to warn an operator of the vehicle of abnormal vehicle deceleration when the brakes are applied; a first electrical contact; a second electrical contact that is normally spaced out of electrical connection with the first contact; means adapted to connect the first and second contacts in circuit with a source of electrical power and the warning device for actuating the warning device only in the event that the first contact makes electrical connection with the second contact; means connected to the first contact and adapted to be connected to the braking fluid system of a motor vehicle, said means being responsive to the pressure of the braking fluid for moving the first contact from a first position to a second position as the fluid pressure increases to above a predetermined pressure normally effective to produce a predetermined deceleration of the vehicle, the first contact being unable to make electrical connection with the second contact unless the first contact reaches at least said second position; and means responsive to deceleration of the vehicle for moving the second contact away from an initial position if the resulting vehicle deceleration attains at least the predetermined deceleration corresponding to said predetermined braking fluid pressure, the second position of the first contact being electrically connected with the initial position of the second contact, such that the first contact will make electrical connection with the second contact if, and only if, the applied braking fluid pressure at least equals said predetermined normal pressure, and the resulting vehicle deceleration is less than a predetermined normal rate of speed reduction corresponding to the predetermined braking fluid pressure. - View Dependent Claims (3, 4, 5, 6, 8, 9, 10, 11)
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7. A braking deceleration warning system for installation in a motor vehicle having a source of electric power and fluid pressure actuated braking means, the warning system comprising:
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an electrically actuated device for warning a vehicle operator of abnormal deceleration of the vehicle when the braking means are actuated; a warning switch body; a first electrical contact mounted in the switch body for movement between a first position and a second position spaced a first predetermined distance from the first position; a second electrical contact mounted in the switch body for movement between an initial position, located on the line between the first and second positions of the first contact and spaced a second predetermined distance from the first position less than said first predetermined distance, and a final position, spaced from the first position of the first contact by a distance from the first position greater than said first predetermined distance; means responsive to braking fluid pressure for moving the first contact from its first position past the initial position of the second contact toward the second position in proportion as the fluid pressure increases past a corresponding predetermined minimum pressure required to actuate the braking means of the vehicle; means responsive to vehicle deceleration for moving the second contact from the initial position to the final position in proportion to the rate of speed reduction increase, the movement of the first contact from its first position as a function of braking fluid pressure being less than the sum of said second predetermined distance and the movement of the second contact from its initial position as a function of the resulting vehicle deceleration so long as the rate of speed reduction remains above a predetermined minimum normal rate corresponding to the braking fluid pressure; and means for connecting the first and second contacts in series with the source of electric power and the warning device for actuating the warning device only if the braking fluid pressure exceeds the predetermined minimum pressure for actuating the braking means and the rate of speed reductions is below a predetermined minimum normal rate corresponding to the braking fluid pressure.
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Specification