Secondary air supply system and vehicle
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsYuuji Araki, Masaki Torigoshi, Hiroki Tanabe, Hitoshi Takikawa
Life of this patent
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Abstract
A secondary air supply system includes a CPU, a first air supply pipe, a second air supply pipe, a first shut-off valve, and a second shut-off valve. First ends of the first air supply pipe and the second air supply pipe are connected to an air cleaner box and the other ends thereof are connected to an exhaust port. The CPU controls opening/closing of the first shut-off valve and the second shut-off valve based on a state of an engine. The first shut-off valve and the second shut-off valve are selectively opened by the CPU, so that air in the air cleaner box is supplied to the exhaust port through the first air supply pipe and/or the second air supply pipe.
Claims11
A secondary air supply system that supplies secondary air to an exhaust passage of an engine, comprising:
- a supply source of the secondary air;
- first and second paths through which the secondary air is supplied from the supply source to the exhaust passage;
- an engine state determination device arranged to determine a state of the engine;
- and
- a path switching device arranged to selectively switch the first and second paths to a communicated state in which the first and second paths communicate the secondary air between the supply source and the exhaust passage, or a shut-off state in which the first and second paths do not communicate the secondary air between the supply source and the exhaust passage, respectively, based on the state of the engine determined by the engine state determination device;
- wherein
- the state of the engine includes a first state and a second state set in advance based on an amount of nitrogen oxide exhausted from a combustion chamber of the engine, and the amount of the nitrogen oxide in the first state is smaller than the amount of the nitrogen oxide in the second state;
- and
- the path switching device brings the first and second paths into the communicated state when the state of the engine is determined to be the first state by the engine state determination device, and brings either one of the first and second paths into the communicated state when the state of the engine is determined to be the second state by the engine state determination device.
A vehicle comprising:
- an engine;
- a drive wheel;
- a transmission mechanism arranged to transmit power generated by the engine to the drive wheel;
- an exhaust passage through which an exhaust gas exhausted from the engine flows;
- a catalyst device that is provided in the exhaust passage and arranged to purify the exhaust gas exhausted from the engine;
- and
- a secondary air supply system that supplies secondary air to the exhaust passage, wherein the secondary air supply system includes:
- a supply source of the secondary air;
- first and second paths through which the secondary air is supplied from the supply source to the exhaust passage;
- an engine state determination device arranged to determine a state of the engine;
- and
- a path switching device arranged to selectively switch the first and second paths to a communicated state in which the first and second paths communicate the secondary air between the supply source and the exhaust passage, or a shut-off state in which the first and second paths do not communicate the secondary air between the supply source and the exhaust passage, respectively, based on the state of the engine determined by the engine state determination device;
- wherein
- the state of the engine includes a first state and a second state set in advance based on an amount of nitrogen oxide exhausted from a combustion chamber of the engine, and the amount of the nitrogen oxide in the first state is smaller than the amount of the nitrogen oxide in the second state;
- and
- the path switching device brings the first and second paths into the communicated state when the state of the engine is determined to be the first state by the engine state determination device, and brings either one of the first and second paths into the communicated state when the state of the engine is determined to be the second state by the engine state determination device.
Dependencies are inferred from the claim text.