An improved amphibious vehicle comprising: a drive train; a plurality of ground engaging wheels; a cooling system; a water propulsion system; and a hull which defines a passenger compartment, wherein the form/shape of the hull below the waterline is substantially defined by a plurality of buoyancy modules that are demountably mountable to the amphibious vehicle.

An amphibious vehicle according to the present invention includes a vehicle body, a traveling portion which causes the vehicle body to travel on land, a propulsion portion which causes the vehicle body to travel on water, a power portion which provides power to the traveling portion and the propulsion portion, and a cooling portion which cools the power portion. The cooling portion includes a first cooling source introducing portion which takes in air from the outside and a second cooling source introducing portion which takes in water from the outside. The second cooling source introducing portion includes an opening which takes in water. The opening is opened on a rear side of a center of gravity of the entire vehicle body and in a draft portion in an outer surface of the vehicle body.

An improved amphibious vehicle comprising: a drive train; a plurality of ground engaging wheels; a cooling system; a water propulsion system; and a hull which defines a passenger compartment, wherein the form/shape of the hull below the waterline is substantially defined by a plurality of buoyancy modules that are demountably mountable to the amphibious vehicle.

A floatable land vehicle is provided that includes a base body having at least one buoyancy body that is detachably fastened to the base body, the buoyancy body containing an at least partially filled tank.

A pressuring system for a vehicle engine includes an intake manifold into which ambient gases flows. A control valve connects to the intake manifold. An engine block connects to the intake manifold and connected to a gases outlet. A timing belt cover connects to the engine block. A gases pipe connects between the control valve and the timing belt cover.

An amphibious vehicle according to the present invention includes a vehicle body, a traveling portion which causes the vehicle body to travel on land, a propulsion portion which causes the vehicle body to travel on water, a power portion which provides power to the traveling portion and the propulsion portion, and a cooling portion which cools the power portion. The cooling portion includes a first cooling source introducing portion which takes in air from the outside and a second cooling source introducing portion which takes in water from the outside. The second cooling source introducing portion includes an opening which takes in water. The opening is opened on a rear side of a center of gravity of the entire vehicle body and in a draft portion in an outer surface of the vehicle body.

An amphibious vehicle power train having an engine (2) with an output shaft (4), driving an input member (6) of a variable speed change transmission (11). The speed change transmission, which may be a continuously variable transmission is arranged to drive road wheels through an output member (8). The engine also drives a marine propulsion unit (24). The axis of the output member (8) is above the axis of the input member (6). Four wheel drive may be provided (FIG. 2).

Aspects of the present invention relate to a vehicle control system, a vehicle, a method and a program configured to, in response to a signal indicative that at least the front of the vehicle is no longer substantially submerged in water, to operate a vehicle cooling fan in a reverse direction, optionally for a predetermined time period. The system may include sensors that determine the water level about the vehicle and automatically operate a vehicle cooling fan in a reverse direction based on said determined water level.

Provided is an amphibious vehicle with which it is possible to increase the driving power even when the engine rotational speed is low. When the engine rotational frequency is lower than a prescribed rotational frequency the fan flow volume of a fan is calculated on the basis of the fan outlet pressure (B1), the amount of heat exchange of a heat exchanger is calculated on the basis of the fan inlet temperature, the fan outlet temperature, and the fan flow volume (B2), a target fan rotational frequency is calculated on the basis of the engine rotational frequency and the heat exchange amount (B3), the fan rotational frequency is reduced so as to achieve the target fan rotational frequency (B4, B5), and the power transmitted to a travel device is increased, thereby increasing the drive torque (B6).

A pressuring system for a vehicle engine includes an intake manifold into which ambient gases flows. A control valve connects to the intake manifold. An engine block connects to the intake manifold and connected to a gases outlet. A timing belt cover connects to the engine block. A gases pipe connects between the control valve and the timing belt cover.