Speed stage shifting of automatic transmission of automobile in relation to yaw rate in steering
First Claim
1. A method of speed stage shift control of an automobile equipped with an automatic transmission for selectively providing a plurality of speed stages, means for detecting operational conditions of said automobile including vehicle speed, steering angle and actual yaw rate, and an electronic control means for processing signals received from said operational condition detecting means and controlling said automatic transmission so as to shift the speed stages based upon said signals, comprising the steps of calculating a standard yaw rate according to said vehicle speed and said steering angle, comparing the calculated standard yaw rate and the actual yaw rate detected by said operational condition detecting means, and modifying said speed shift control by said electronic control means according to the difference between the actual yaw rate and the standard yaw rate.
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Accused Products
Abstract
Whether the load on the automobile is normal or heavy or whether the automobile is in a normal, oversteering or understeering condition is detected by a rising-up performance of the yaw rate in the initial transient state of steering from a comparison of an actual yaw rate detected by a sensor and a standard yaw rate calculated from vehicle speed and steering angle, and the speed stage shifting of the automatic transmission is modified according to the result of the comparison so as to compensate for a change of load or a deviation of steering performance from a normal condition.
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Citations
7 Claims
- 1. A method of speed stage shift control of an automobile equipped with an automatic transmission for selectively providing a plurality of speed stages, means for detecting operational conditions of said automobile including vehicle speed, steering angle and actual yaw rate, and an electronic control means for processing signals received from said operational condition detecting means and controlling said automatic transmission so as to shift the speed stages based upon said signals, comprising the steps of calculating a standard yaw rate according to said vehicle speed and said steering angle, comparing the calculated standard yaw rate and the actual yaw rate detected by said operational condition detecting means, and modifying said speed shift control by said electronic control means according to the difference between the actual yaw rate and the standard yaw rate.
Specification