Control device of straddle-type vehicle, transmission, and straddle-type vehicle

A control device for an electronically controlled transmission disposed between a driving source and a driving wheel of a straddle-type vehicle,

• wherein the straddle-type vehicle includes
• a shift-down permission switch that outputs a shift-down permission signal to the control device,
• a throttle operation member that operates a throttle, and
• a throttle operation member sensor that detects at least one of an operation amount of the throttle operation member and an operation speed of the throttle operation member,
• wherein the control device comprises:
• a transmission ratio control portion that controls a transmission ratio of the transmission;
• a shift mode selection portion that is capable of selecting an MT mode in which the transmission ratio control portion changes the transmission ratio of the transmission between a plurality of predetermined transmission ratios, the shift mode selection portion being configured such that, in the MT mode, the MT mode is shifted to a shift-down permission mode to when the shift-down permission signal is output;
• and
• a shift-down operation amount computation portion that computes a shift-down operation amount based on a vehicle state of the straddle-type vehicle that includes at least one of the operation amount of the throttle operation member and the operation speed of the throttle operation member,
• wherein the transmission ratio control portion, in the shift-down permission mode, automatically shifts down the transmission ratio of the transmission based on the shift-down operation amount when the throttle is operated.

A transmission, comprising:

• an electronically controlled transmission mechanism, disposed between a driving source and a driving wheel of a straddle-type vehicle, that is capable of continuously changing a transmission ratio;
• and
• a control unit that controls the transmission mechanism,
• wherein the straddle-type vehicle includes
• a shift-down permission switch that outputs a shift-down permission signal to the control unit,
• a throttle operation member that operates a throttle, and
• a throttle operation member sensor that detects at least one of an operation amount of the throttle operation member and an operation speed of the throttle operation member,
• wherein the control unit includes
• a transmission ratio control portion that controls the transmission ratio of the transmission according to a transmission ratio map,
• a shift mode selection portion that is capable of selecting, in accordance with a running state of the straddle-type vehicle, an AT mode in which the transmission ratio control portion continuously changes the transmission ratio of the transmission, the shift mode selection portion being configured such that, in the AT mode, the AT mode is shifted to a shift-down permission mode when the shift-down permission signal is output, and
• a shift-down operation amount computation portion that computes a shift-down operation amount, different from a shift-down transmission ratio stored in the transmission ratio map, based on a vehicle state of the straddle-type vehicle that includes at least one of the operation amount of the throttle operation member and the operation speed of the throttle operation member,
• wherein the transmission ratio control portion, in the shift-down permission mode, shifts down the transmission ratio of the transmission based on the shift-down operation amount when the throttle is operated.

A straddle-type vehicle, comprising:

• a driving source;
• a driving wheel that is driven by the driving source;
• a transmission including an electronically controlled transmission mechanism, disposed between the driving source and the driving wheel, that is capable of continuously changing a transmission ratio, and a control unit that controls the transmission mechanism;
• a shift-down permission switch that outputs a shift-down permission signal to the control unit;
• a throttle operation member that operates a throttle;
• and
• a throttle operation member sensor that detects at least one of an operation amount of the throttle operation member and an operation speed of the throttle operation member,
• wherein the control unit includes
• a transmission ratio control portion that controls the transmission ratio of the transmission according to a transmission ratio map,
• a shift mode selection portion that is capable of selecting, in accordance with a running state of the straddle-type vehicle, an AT mode in which the transmission ratio control portion continuously changes the transmission ratio of the transmission, the shift mode selection portion being configured such that, in the AT mode, the AT mode is shifted to a shift-down permission mode when the shift-down permission signal is output, and
• a shift-down operation amount computation portion that computes a shift-down operation amount, different from a shift-down transmission ratio stored in the transmission ratio map, based on a vehicle state of the straddle-type vehicle that includes at least one of the operation amount of the throttle operation member and the operation speed of the throttle operation member,
• wherein the transmission ratio control portion, in the shift-down permission mode, shifts down the transmission ratio of the transmission based on the shift-down operation amount when the throttle is operated.

A straddle-type vehicle, comprising:

• a driving source;
• a driving wheel that is driven by the driving source;
• a transmission including an electronically controlled transmission mechanism, disposed between the driving source and the driving wheel of the straddle-type vehicle, and a control unit that controls the transmission mechanism;
• a shift-down permission switch that outputs a shift-down permission signal to the control unit;
• a throttle operation member that operates a throttle;
• and
• a throttle operation member sensor that detects at least one of an operation amount of the throttle operation member and an operation speed of the throttle operation member,
• wherein the control unit includes:
• a transmission ratio control portion that controls the transmission ratio of the transmission;
• a shift mode selection portion that is capable of selecting an MT mode in which the transmission ratio control portion changes the transmission ratio of the transmission between a plurality of predetermined transmission ratios, the shift mode selection portion being configured such that, in the MT mode, the MT mode is shifted to a shift-down permission mode when the shift-down permission signal is output;
• and
• a shift-down operation amount computation portion that computes a shift-down operation amount based on a vehicle state of the straddle-type vehicle that includes at least one of the operation amount of the throttle operation member and the operation speed of the throttle operation member, and
• wherein the transmission ratio control portion, in the shift-down permission mode, automatically shifts down the transmission ratio of the transmission based on the shift-down operation amount when the throttle is operated.