Vehicle control system
First Claim
Patent Images
1. A vehicle control system comprising:
- an information obtaining means for obtaining road information around a vehicle; and
an automatic vehicle traveling means for operating a power generating means mounted in the vehicle based on the road information in order to bring the vehicle from vehicle stopping condition to vehicle traveling condition, when a demand for changing the vehicle condition from the stopping condition to the traveling condition is generated,wherein the road information includes information relating to a road gradient around the vehicle and information relating to a friction between vehicle wheels and road surface around the vehicle,wherein the automatic vehicle traveling means makes vehicle acceleration smaller as the road gradient becomes larger during an operation for changing the vehicle condition to the vehicle traveling condition, when the vehicle is on a sloping road and the vehicle is traveling in a direction opposite to a direction of a force of gravity applied to the vehicle, andwherein the automatic vehicle traveling means makes vehicle acceleration smaller, as frictional force between the vehicle wheels and the road surface becomes smaller during the operation for changing the vehicle condition to the vehicle traveling condition.
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Abstract
When a vehicle is started on an uphill road, slip may easily occur between vehicle wheels and a sloping road surface. When vehicle condition is changed from its stopping condition to its traveling condition on the uphill road, vehicle acceleration is controlled in a feed-back operation in such a manner that a target acceleration is made smaller as road gradient becomes larger or coefficient of friction becomes smaller.
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Citations
22 Claims
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1. A vehicle control system comprising:
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an information obtaining means for obtaining road information around a vehicle; and an automatic vehicle traveling means for operating a power generating means mounted in the vehicle based on the road information in order to bring the vehicle from vehicle stopping condition to vehicle traveling condition, when a demand for changing the vehicle condition from the stopping condition to the traveling condition is generated, wherein the road information includes information relating to a road gradient around the vehicle and information relating to a friction between vehicle wheels and road surface around the vehicle, wherein the automatic vehicle traveling means makes vehicle acceleration smaller as the road gradient becomes larger during an operation for changing the vehicle condition to the vehicle traveling condition, when the vehicle is on a sloping road and the vehicle is traveling in a direction opposite to a direction of a force of gravity applied to the vehicle, and wherein the automatic vehicle traveling means makes vehicle acceleration smaller, as frictional force between the vehicle wheels and the road surface becomes smaller during the operation for changing the vehicle condition to the vehicle traveling condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A vehicle control system comprising:
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an electronic control unit for receiving various vehicle information relating to a road condition and a vehicle traveling condition, the vehicle information including at least a road gradient and a vehicle speed, wherein the electronic control unit has a vehicle start control portion, which calculates a target vehicle acceleration based on the vehicle information including the road gradient, when the vehicle is to be started on an uphill road, wherein the electronic control unit calculates, based on the target acceleration, a required engine torque, a required gear ratio and a required brake pressure, so that an engine is operated to generate the required engine torque, a transmission apparatus is operated with the required gear ratio, and hydraulic brake pressure is controlled at the required brake pressure, in order that vehicle acceleration is controlled at the target acceleration during an operation for changing a vehicle condition from a vehicle stopping condition to a vehicle traveling condition, and wherein the target acceleration is limited to such a value, within which slip may not occur between vehicle wheels and a road surface, wherein the target acceleration is controlled to become smaller as the road gradient becomes larger during the operation for changing the vehicle condition to the vehicle traveling condition, when the vehicle is on a sloping road and the vehicle is traveling in a direction opposite to a direction of a force of gravity applied to the vehicle and wherein the target acceleration is controlled to become smaller, as frictional force between the vehicle wheels and the road surface becomes smaller during the operation for changing the vehicle condition to the vehicle traveling condition. - View Dependent Claims (11)
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12. A vehicle control system comprising:
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an information obtaining means for obtaining road information around a vehicle; and an automatic vehicle traveling means for operating a power generating means mounted in the vehicle based on the road information in order to bring the vehicle from vehicle stopping condition to vehicle traveling condition, when a demand for changing the vehicle condition from the stopping condition to the traveling condition is generated, wherein the road information includes information relating to a road gradient around the vehicle and information relating to a friction between vehicle wheels and road surface around the vehicle, wherein the automatic vehicle traveling means makes torque to be generated by the power generating means and applied to vehicle driving wheels smaller, as the road gradient becomes larger during an operation for changing the vehicle condition to the vehicle traveling condition, when the vehicle is on a sloping road and the vehicle is traveling in a direction opposite to a direction of a force of gravity applied to the vehicle, and wherein the automatic vehicle traveling means makes torque to be generated by the power generating means and applied to vehicle driving wheels smaller, as frictional force between the vehicle wheels and the road surface becomes smaller during the operation for changing the vehicle condition to the vehicle traveling condition. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A vehicle control system comprising:
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an electronic control unit for receiving various vehicle information relating to a road condition and a vehicle traveling condition, the vehicle information including at least a road gradient and a vehicle speed, wherein the electronic control unit has a vehicle start control portion, which calculates a target vehicle acceleration based on the vehicle information including the road gradient, when the vehicle is to be started on an uphill road, wherein the electronic control unit calculates, based on the target acceleration, a required engine torque, a required gear ratio and a required brake pressure, so that an engine is operated to generate the required engine torque, a transmission apparatus is operated with the required gear ratio, and hydraulic brake pressure is controlled at the required brake pressure, in order that vehicle acceleration is controlled at the target acceleration during an operation for changing a vehicle condition from a vehicle stopping condition to a vehicle traveling condition, and wherein the target acceleration is limited to such a value, within which slip may not occur between vehicle wheels and a road surface, wherein the engine and the transmission apparatus form a power generating unit, a torque to be generated by the power generating unit and applied to vehicle driving wheels is controlled to become smaller, as the road gradient becomes larger during the operation for changing the vehicle condition to the vehicle traveling condition, when the vehicle is on a sloping road and the vehicle is traveling in a direction opposite to a direction of a force of gravity applied to the vehicle, and the above torque to be generated by the power generating unit and applied to the vehicle driving wheels is further controlled to become smaller, as frictional force between the vehicle wheels and the road surface becomes smaller during the operation for changing the vehicle condition to the vehicle traveling condition.
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Specification