Transmission system for a vehicle, preferably a bicycle

A transmission system for a human powered vehicle, comprising:

• a system input and a system output, wherein the system input is arranged to be connected to a power source, and the system output is arranged to be connected to a load,
• a continuously variable transmission (CVT) and a first transmission between the system input and the system output, and
• a control unit configured to control the CVT and the first transmission;
• the control unit being configured to control the CVT to selectively operate according to one of two or more distinct transmission ratios within a continuous range of transmission ratios, and the CVT having an actuation element for switching the CVT from one transmission ratio to another;
• and
• the control unit being configured to control the first transmission to selectively operate according to a first transmission ratio or a second transmission ratio;
• wherein the CVT and the first transmission are connected in series, such that the transmission system is operable according to a plurality of different system transmission ratios determined by the selected transmission ratio of the CVT and the selected transmission ratio of the first transmission, and
• wherein the transmission ratios for operation of the CVT are chosen such that the system transmission ratios have a substantially constant transmission step size between respective system transmission ratios.

A transmission system for a human powered vehicle, comprising:

• a system input and a system output, wherein the system input is arranged to be connected to a power source, and the system output is arranged to be connected to a load,
• a continuously variable transmission (CVT) and a first transmission between the system input and the system output, and
• a control unit configured to control the CVT and the first transmission;
• the control unit being configured to control the CVT to selectively operate according to one of two or more distinct transmission ratios within a continuous range of transmission ratios, and the CVT having an actuation element for switching the CVT from one transmission ratio to another;
• and
• the control unit being configured to control the first transmission to selectively operate according to a first transmission ratio or a second transmission ratio;
• wherein the CVT and the first transmission are connected in series, such that the transmission system is operable according to a plurality of different system transmission ratios determined by the selected transmission ratio of the CVT and the selected transmission ratio of the first transmission, and
• wherein the transmission ratios for operation of the CVT are chosen such that the system transmission ratios include a nonlinear set of system transmission ratios.