Gear shift control system of an automatic transmission
First Claim
1. A gear shift control system for an automatic transmission, said automatic transmission having a plurality of gear-shift stages and being combined with an internal combustion engine mounted in a vehicle, said gear shift control system comprising:
- load and speed detecting means for repeatedly detecting the load on the engine and the speed of the vehicle;
memory means stored with a plurality of shift lines, each said shift line divisively defining the region of each gear-shift stage in accordance with the engine load and the vehicle speed;
load tendency detecting means for obtaining a tendency of transition of the engine load;
speed tendency detecting means for obtaining a tendency of transition of the vehicle speed;
inference means for inferring the running state of the vehicle from the respective transition tendencies of the engine load and the vehicle speed and obtaining a decision value as a result of the inference;
correction means for determining a change of the shift lines and for determining an amount of the change, in accordance with the decision value; and
shift means for delivering a shift command signal to the automatic transmission when one of the shift lines, which is determined by said correction means, is crossed by a representative point, which is obtained from said load and speed detecting means for detecting the engine load and the vehicle speed, and indicates the driving conditions of the vehicle, said shift command signal corresponding to the region of the gear-shift stage on the side to which the representative point is moved, whereby the gear-shift stage of the automatic transmission is switched in accordance to said shift command signal when said shift command signal is received by the automatic transmission.
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Accused Products
Abstract
A gear shift control system according to this invention includes a throttle opening sensor, a vehicle speed sensor and a controller for delivering a shift command signal to an automatic transmission. The controller is previously stored with shift lines, which divide the respective regions of gear-shift stages, on the basis of the throttle opening and the vehicle speed. The controller delivers the shift command signal to the transmission when any of the shift lines is crossed by a shift point which is defined by the throttle opening and the vehicle speed. Taking account of the changing rate of the throttle opening, the past throttle opening, and the acceleration of the vehicle, however, the controller calculates a decision value which is indicative of the running state of the vehicle, on the basis of the fuzzy theory. When the decision value exceeds a predetermined value, the controller corrects the shift lines depending on the running state.
20 Citations
17 Claims
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1. A gear shift control system for an automatic transmission, said automatic transmission having a plurality of gear-shift stages and being combined with an internal combustion engine mounted in a vehicle, said gear shift control system comprising:
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load and speed detecting means for repeatedly detecting the load on the engine and the speed of the vehicle; memory means stored with a plurality of shift lines, each said shift line divisively defining the region of each gear-shift stage in accordance with the engine load and the vehicle speed; load tendency detecting means for obtaining a tendency of transition of the engine load; speed tendency detecting means for obtaining a tendency of transition of the vehicle speed; inference means for inferring the running state of the vehicle from the respective transition tendencies of the engine load and the vehicle speed and obtaining a decision value as a result of the inference; correction means for determining a change of the shift lines and for determining an amount of the change, in accordance with the decision value; and shift means for delivering a shift command signal to the automatic transmission when one of the shift lines, which is determined by said correction means, is crossed by a representative point, which is obtained from said load and speed detecting means for detecting the engine load and the vehicle speed, and indicates the driving conditions of the vehicle, said shift command signal corresponding to the region of the gear-shift stage on the side to which the representative point is moved, whereby the gear-shift stage of the automatic transmission is switched in accordance to said shift command signal when said shift command signal is received by the automatic transmission. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification