摘要:
A mounting structure is provided for an air-fuel ratio sensor on an exhaust pipe in a motorcycle in which a concentration of oxygen in an exhaust gas can be detected efficiently and accurately by the air-fuel ratio sensor. The air-fuel ratio sensor is mounted on a convergent connector of exhaust pipes, which, in turn, are operatively connected to the cylinders of a multi-cylinder engine. The air-fuel ratio sensor is located upstream of catalytic converters provided in the exhaust pipes, and may be mounted so as to be oriented substantially vertically when the motorcycle is in an upright configuration, or alternatively, may be inclined toward the rear of the motorcycle.
摘要:
A jet-propelled watercraft capable of maintaining a propulsion force required for a turn made at the same time as closing of a throttle valve. The jet-propelled watercraft has an auxiliary intake valve and an ECU. The auxiliary intake valve in an intake pipe opens/closes an auxiliary intake passage to bypass a throttle valve. The ECU performs control such that an opening of the auxiliary intake valve in a state where the rotation speed of the engine is not lower than a threshold value is larger than the opening of the auxiliary intake valve in a state where the engine is idling. When in a state where the rotation speed is not lower than the threshold value, it is detected that the throttle valve is completely closed and that a steering mechanism has been turned by a prescribed angle or more, a current opening of the auxiliary intake valve is maintained.
摘要:
A mounting structure is provided for an air-fuel ratio sensor on an exhaust pipe in a motorcycle in which a concentration of oxygen in an exhaust gas can be detected efficiently and accurately by the air-fuel ratio sensor. The air-fuel ratio sensor is mounted on a convergent connector of exhaust pipes, which, in turn, are operatively connected to the cylinders of a multi-cylinder engine. The air-fuel ratio sensor is located upstream of catalytic converters provided in the exhaust pipes, and may be mounted so as to be oriented substantially vertically when the motorcycle is in an upright configuration, or alternatively, may be inclined toward the rear of the motorcycle.
摘要:
A jet-propelled watercraft capable of maintaining a propulsion force required for a turn made at the same time as closing of a throttle valve. The jet-propelled watercraft has an auxiliary intake valve and an ECU. The auxiliary intake valve in an intake pipe opens/closes an auxiliary intake passage to bypass a throttle valve. The ECU performs control such that an opening of the auxiliary intake valve in a state where the rotation speed of the engine is not lower than a threshold value is larger than the opening of the auxiliary intake valve in a state where the engine is idling. When in a state where the rotation speed is not lower than the threshold value, it is detected that the throttle valve is completely closed and that a steering mechanism has been turned by a prescribed angle or more, a current opening of the auxiliary intake valve is maintained.
摘要:
A controller that executes engine output control that a throttle is closed when a boat is navigated at a predetermined speed or higher and the output of an engine is gradually increased up to predetermined output when a steering system is steered right or left at a predetermined angle or more is provided. Thus, an overshoot phenomenon that the engine speed is held at a predetermined engine speed after the engine speed once increases up to the predetermined engine speed or higher when the engine speed is increased in deceleration can be avoided. As a result, the body of the boat can be prevented from sliding laterally to a great extent at the beginning of turning and the turning performance of the body can be enhanced.
摘要:
A mounting structure for an air-fuel ratio sensor in a motorcycle is provided which eliminates the influence of water gathered in an exhaust pipe upon the air-fuel ratio sensor and improves the mountability of the air-fuel ratio sensor to the exhaust pipe. The air-fuel ratio sensor is mounted on an exhaust pipe connected to an engine in a motorcycle so that the air-fuel ratio sensor extends radially with respect to a longitudinal axis of the exhaust pipe, and is inclined upward by an angle of 10° or more with respect to a horizontal line H passing through the center of the exhaust pipe 32 in its cross section. The air-fuel ratio sensor is pointed toward the central lateral plane of the motorcycle as viewed in front elevation of the motorcycle.
摘要:
An air-fuel ratio setting section sets a target air-fuel ratio KCMD according to the conditions of an engine. An air-fuel ratio correction coefficient calculating section calculates an air-fuel ratio correction coefficient KAF for controlling the air-fuel ratio wherein a detected air-fuel ratio KACT detected by a LAF sensor is converged to the target air-fuel ratio KCMD. A lower limit section constrains the air-fuel ratio correction coefficient KAF so as not to underrun the lower limit value. An upper limit section constrains the air-fuel ratio correction coefficient KAF so as not to exceed the upper limit value. A basic fuel injection time determining section calculates a basic fuel injection time TIM. A fuel injection time calculating section calculates a fuel injection time TOUT based on the target air-fuel ratio KCMD, the air-fuel ratio correction coefficient KAF, the basic fuel injection time TIM or the like, and various engine parameters.
摘要:
A mounting structure for an air-fuel ratio sensor in a motorcycle is provided which eliminates the influence of water gathered in an exhaust pipe upon the air-fuel ratio sensor and improves the mountability of the air-fuel ratio sensor to the exhaust pipe. The air-fuel ratio sensor is mounted on an exhaust pipe connected to an engine in a motorcycle so that the air-fuel ratio sensor extends radially with respect to a longitudinal axis of the exhaust pipe, and is inclined upward by an angle of 10° or more with respect to a horizontal line H passing through the center of the exhaust pipe 32 in its cross section. The air-fuel ratio sensor is pointed toward the central lateral plane of the motorcycle as viewed in front elevation of the motorcycle.
摘要:
To provide a jet propulsion boat that enables preventing the occurrence of cavitation. In a jet propulsion boat that jets water pressurized and accelerated by a water jet pump from a rear jet nozzle and is propelled by its reaction, a turbocharger is provided to an engine for driving the water jet pump and in case the rate of the rise of engine speed is a predetermined value or more, delay control is applied to the rise of the boost pressure of the turbocharger.
摘要:
To provide an engine control unit that can easily realize reacceleration in a jet propulsion boat. In a controller mounted in a jet propulsion boat that jets water pressurized and accelerated by a water jet pump from a rear jet and is propelled by its reaction, in case a throttle angle of an engine narrows in a state in which the speed of the engine that drives the water jet pump is equal to or exceeds a predetermined value, advance angle control is made over the ignition timing of the engine.