ANTISKID CONTROL CIRCUIT
First Claim
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1. An acceleration and deceleration sensor for antiskid devices in vehicles comprising:
- a voltage generator producing an output voltage proportional to wheel speed and having superimposed thereon interfering upper harmonics of said output voltage;
a filter circuit including a first capacitor and a two terminal non-capacitive component, one terminal of said non-capacitive component being directly connected to said generator and said first capacitor being directly connected between the other terminal of said non-capacitive component and a reference voltage;
a differentiating circuit including a second capacitor and a resistive component coupled in series with respect to each other and in parallel with respect to said first capacitor to provide across at least a portion of said resistive component acceleration and deceleration signals; and
a pair of semi-conductor devices having opposite forward directions directly connected in parallel with respect to each other and said parallel connected devices are directly connected in parallel with only said non-capacitive component;
said non-capacitive component having developed thereacross a predetermined forward bias voltage for said pair of devices, each of said devices being rendered conductive when its said predetermined bias voltage is exceeded to conduct said output voltage from said generator to said differentiating circuit without significant time delay and without significant effect on said acceleration and deceleration signals by said intefering harmonics.
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Abstract
In this antiskid control of the type in which a DC signal proportional to wheel speed is filtered and differentiated in an RC-circuit to obtain an acceleration signal free of undesirable harmonics, diodes or other semi-conductors having a fixed forward voltage are connected in opposite forward direction in parallel to the resistance of the filter so that an acceleration signal bypasses the resistance and is conducted to the discriminator without significant time delay when the forward voltage of the diodes is exceeded.
1 Citation
7 Claims
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1. An acceleration and deceleration sensor for antiskid devices in vehicles comprising:
- a voltage generator producing an output voltage proportional to wheel speed and having superimposed thereon interfering upper harmonics of said output voltage;
a filter circuit including a first capacitor and a two terminal non-capacitive component, one terminal of said non-capacitive component being directly connected to said generator and said first capacitor being directly connected between the other terminal of said non-capacitive component and a reference voltage;
a differentiating circuit including a second capacitor and a resistive component coupled in series with respect to each other and in parallel with respect to said first capacitor to provide across at least a portion of said resistive component acceleration and deceleration signals; and
a pair of semi-conductor devices having opposite forward directions directly connected in parallel with respect to each other and said parallel connected devices are directly connected in parallel with only said non-capacitive component;
said non-capacitive component having developed thereacross a predetermined forward bias voltage for said pair of devices, each of said devices being rendered conductive when its said predetermined bias voltage is exceeded to conduct said output voltage from said generator to said differentiating circuit without significant time delay and without significant effect on said acceleration and deceleration signals by said intefering harmonics.
- a voltage generator producing an output voltage proportional to wheel speed and having superimposed thereon interfering upper harmonics of said output voltage;
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2. The sensor according to claim 1, wherein said devices are semi-conductor diodes.
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3. The sensor according to claim 2, wherein said predetermined bias voltage equals one half of the amplitude of said interfering harmonics.
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4. The sensor according to claim 2, wherein said non-capacitive component is a resistor, and said diodes are directly connected in parallel to each other and said parallel connected diodEs are directly connected in parallel with only said resistor.
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5. The sensor according to claim 4, wherein said predetermined bias voltage equals one half of the amplitude of said interfering harmonics.
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6. The sensor according to claim 4, wherein said resistive component is a potentiometer having a movable terminal, and said acceleration and deceleration signals are present at said movable terminal.
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7. The sensor according to claim 6, further including a threshold discriminator coupled to said movable terminal to produce antiskid control signals.
Specification