Apparatus and method for automatically controlling vehicular velocity
First Claim
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1. A vehicular velocity controlling apparatus for an automotive vehicle, comprising:
- an inter-vehicle distance detector detecting an inter-vehicle distance from the vehicle to another vehicle which is running ahead of the vehicle;
a vehicle velocity detector detecting a vehicular velocity of the vehicle;
an inter-vehicle distance controller, the inter-vehicle distance controller calculating a target value of the vehicular velocity, the target value of the vehicular velocity being calculated to make the detected value of the inter-vehicle distance equal to a target value of the inter-vehicle distance;
a vehicular velocity servo controller, the vehicular velocity servo controller being responsive to the target value of the vehicular velocity from the inter-vehicle distance controller, calculating a target value of a vehicular force to be exerted by the vehicle to vary the vehicular velocity according to the target value of the vehicular velocity, and distributing the target value of the vehicular force exerted by the vehicle into a vehicular driving force for a vehicular drive system and a vehicular braking force for a vehicular brake system;
a comparator, the comparator comparing the detected value of the vehicular velocity with a set lower limit value of the vehicular velocity in a vehicular velocity controllable range;
a control release command generator, the control release command generator being responsive to a result of a comparison by the comparator indicating that the detected value of the vehicular velocity, which is made equal to the target value of the vehicular velocity according to the result of vehicular force by means of the vehicular servo controller, is lower than the set lower limit value and generating and outputting a release command to release a calculation of the target value of the vehicular velocity by the inter-vehicle distance controller and to release the calculation of the target value of the vehicular force by the vehicular velocity servo controller; and
a function generator, the function generator being responsive to the result of the comparison by the comparator and generating and outputting a predetermined function to the vehicular brake system to only continue a control of the vehicular braking force through the vehicular brake system.
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Abstract
In apparatus and method for controlling a vehicular velocity for an automotive vehicle, when a controller carries out a preceding vehicle follow-up control to follow up a preceding vehicle which is traveling ahead of the vehicle and is decelerated and a vehicular velocity of the vehicle becomes reduced and has crossed a set lower limit value of the vehicular velocity in a vehicular velocity controllable range, the controller releases the preceding vehicle follow-up control but continues a braking operation through a vehicular brake system using a function generator (Pbrk*=f(t)MPa) to prevent a sudden G drop from occurring.
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Citations
13 Claims
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1. A vehicular velocity controlling apparatus for an automotive vehicle, comprising:
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an inter-vehicle distance detector detecting an inter-vehicle distance from the vehicle to another vehicle which is running ahead of the vehicle;
a vehicle velocity detector detecting a vehicular velocity of the vehicle;
an inter-vehicle distance controller, the inter-vehicle distance controller calculating a target value of the vehicular velocity, the target value of the vehicular velocity being calculated to make the detected value of the inter-vehicle distance equal to a target value of the inter-vehicle distance;
a vehicular velocity servo controller, the vehicular velocity servo controller being responsive to the target value of the vehicular velocity from the inter-vehicle distance controller, calculating a target value of a vehicular force to be exerted by the vehicle to vary the vehicular velocity according to the target value of the vehicular velocity, and distributing the target value of the vehicular force exerted by the vehicle into a vehicular driving force for a vehicular drive system and a vehicular braking force for a vehicular brake system;
a comparator, the comparator comparing the detected value of the vehicular velocity with a set lower limit value of the vehicular velocity in a vehicular velocity controllable range;
a control release command generator, the control release command generator being responsive to a result of a comparison by the comparator indicating that the detected value of the vehicular velocity, which is made equal to the target value of the vehicular velocity according to the result of vehicular force by means of the vehicular servo controller, is lower than the set lower limit value and generating and outputting a release command to release a calculation of the target value of the vehicular velocity by the inter-vehicle distance controller and to release the calculation of the target value of the vehicular force by the vehicular velocity servo controller; and
a function generator, the function generator being responsive to the result of the comparison by the comparator and generating and outputting a predetermined function to the vehicular brake system to only continue a control of the vehicular braking force through the vehicular brake system. - View Dependent Claims (2, 3, 4, 11, 12)
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5. A vehicular velocity controlling apparatus for an automotive vehicle, comprising:
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an inter-vehicle distance detector detecting an inter-vehicle distance from the vehicle to another vehicle which is running ahead of the vehicle;
a vehicle velocity detector detecting a vehicular velocity of the vehicle;
an inter-vehicle distance controller, the inter-vehicle distance controller calculating a target value of the vehicular velocity, the target value of the vehicular velocity being calculated to make the detected value of the inter-vehicle distance equal to a target value of the inter-vehicle distance;
a vehicular velocity servo controller, the vehicular velocity servo controller being responsive to the target value of the vehicular velocity from the inter-vehicle distance controller, calculating a target value of a vehicular force to be exerted by the vehicle to vary the vehicular velocity according to the target value of the vehicular velocity, and distributing the target value of the vehicular force exerted by the vehicle into a vehicular driving force for a vehicular drive system and a vehicular braking force for a vehicular brake system;
a comparator, the comparator comparing the detected value of the vehicular velocity with a set lower limit value of the vehicular velocity in a vehicular velocity controllable range;
a control release command generator, the control release command generator being responsive to a result of a comparison by the comparator and generating and outputting a release command to release a calculation of the target value of the vehicular velocity by the inter-vehicle distance controller and to release the calculation of the target value of the vehicular force by the vehicular velocity servo controller; and
a function generator, the function generator being responsive to the result of the comparison by the comparator and generating and outputting a predetermined function to the vehicular brake system to only continue a control of the vehicular braking force through the vehicular brake system;
whereinthe function generator includes;
a determinator determining whether a target value of a braking liquid pressure, at a time point when the result of the comparison by the comparator indicates that the vehicular velocity becomes reduce and has crossed the set lower limit value VL of the vehicular velocity, is greater than a predetermined braking liquid value; and
a braking liquid pressure command generator, the braking liquid pressure command generator being responsive to the result of the determination by the determinator and generating and outputting the target value of the braking liquid pressure as a braking liquid pressure command value Pbrk to a braking pressure servo calculating block of the vehicular velocity servo controller, the target value of the braking liquid pressure being the predetermined function dependent upon the result of the determination by the determinator. - View Dependent Claims (6, 7, 8, 9, 10)
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13. A vehicular velocity controlling method for an automotive vehicle, comprising:
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detecting an inter-vehicle distance from the vehicle to another vehicle which is running ahead of the vehicle;
detecting a vehicular velocity of the vehicle;
calculating a target value of the vehicular velocity, the target value of the vehicular velocity being calculated to make the detected value of the inter-vehicle distance equal to a target value of the inter-vehicle distance;
calculating a target value of a vehicular force to be exerted by the vehicle to vary the vehicular velocity according to the target value of the vehicular velocity;
distributing the target value of the vehicular force exerted by the vehicle into a vehicular driving force for a vehicular drive system and a vehicular braking force for a vehicular brake system;
comparing the detected value of the vehicular velocity with a set lower limit value of the vehicular velocity in a vehicular velocity controllable range;
outputting a release command to release a calculation of the target value of the vehicular velocity and to release the calculation of the target value of the vehicular force in response to a result of the comparing indicating that the detected value of the vehicular velocity, which is made equal to the target value of the vehicular velocity as a result of the distributing the target value of the vehicular force exerted by the vehicle, is lower than the set lower limit value; and
outputting a predetermined function to the vehicular brake system to only continue a control of the vehicular braking force through the vehicular brake system.
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Specification