| CPC F16H 61/0403 (2013.01) [F16H 2061/0474 (2013.01)] | 10 Claims |
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1. A transmission control device configured to control a prime mover in a system including the prime mover and a gear transmission, the transmission control device comprising:
a processing circuitry, wherein
the gear transmission includes an input shaft to which a driving force of the prime mover is transmitted, an output shaft, a plurality of dogs movable to the input shaft and the output shaft and each corresponding to a plurality of transmission gear positions, and a plurality of transmission gears each corresponding to the plurality of transmission gear positions and including an accommodation space into which the dog is capable of entering,
the transmission gears include a first surface and a second surface by which the accommodation space is defined in a circumferential direction of the transmission gears, the first surface being a surface against which the dog abuts when torque is transmitted to the output shaft in a positive direction, and the second surface being a surface against which the dog abuts when torque is transmitted to the output shaft in a negative direction opposite to the positive direction,
the transmission control device causes the processing circuitry to execute a process, the process including:
determining whether to fall into a first situation at a time of acquiring a shift command for shifting from a first transmission gear position to a second transmission gear position, the first situation being a situation where the shift command is a shift-down command and the dog abuts against the first surface at the first transmission gear position or a situation where the shift command is a shift-up command and the dog abuts against the second surface at the first transmission gear position;
when the processing circuitry is determined as being the first situation, starting a separation control that adjusts an output of the prime mover such that the dog is separated from an abutment surface against which the dog abuts at the time of acquiring the shift command, the abutment surface being the first surface or the second surface; and
after the separation control is completed and before the dog at the first transmission gear position moves out of the accommodation space at the first transmission gear position, starting a synchronous control that brings one of a rotational speed of the dog at the second transmission gear position and a rotational speed of the transmission gears at the second transmission gear position close to the other.
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