# US 2009/0260908 A1 · Straddle-type vehicle > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2009/0260908 A1 - Document ID: US20090260908A1 - Status: Published application - Kind: A1 - Application number: 12/418,395 - Filed: 2009-04-03 - Published: 2009-10-22 - Earliest claimed: 2008-04-21 - Assignees: Yamaha Hatsudoki Kabushiki Kaisha - Inventors: Yoshitomi Nakagawa; Akira Hiratsuka; Yuuichirou Watanabe - Web page: https://patentgrep.com/patent/US20090260908A1 ## CPC - B62K 11/04: characterised by the engine being between front and rear wheels - F02D 11/105: {characterised by the function converting demand to actuation, e.g. a map indicating relations between an accelerator pedal position and throttle valve opening or target engine torque} - F02D 31/002: {controlling air supply} - B60W 2510/0638: Engine speed - B60W 2520/10: Longitudinal speed - B60W 2540/10: Accelerator pedal position - F02D 2011/102: {at least one throttle being moved only by an electric actuator} - F02D 2200/602: Pedal position - B62K: CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDECARS, FORECARS, OR THE LIKE - F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W) - B60W: CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT ## Abstract A straddle-type vehicle includes an engine, an air intake pipe, a throttle valve being controlled in accordance with an operation amount of an accelerator grip, an engine rotating speed detector or a vehicle speed detector, and an electronic control unit (ECU). The ECU increases the opening degree of the throttle valve or maintains the opening degree at a constant value until the engine rotating speed reaches a set rotating speed which is smaller than a prescribed rotating speed, but if the engine rotating speed exceeds the set rotating speed, the ECU reduces the opening degree of the throttle valve irrespective of operation of the accelerator grip. ## Claims ### Claim 1 A straddle-type vehicle, comprising: an engine; an air intake passage for introducing air into the engine; an electronic control throttle valve which is disposed in the air intake passage and which is controlled in accordance with an operational amount of an accelerator operating element; a detector which detects a rotating speed of the engine or a vehicle speed, and a control apparatus which controls the throttle valve such that a detected speed which is the rotating speed of the engine or the vehicle speed detected by the detector is equal to or lower than a prescribed value, wherein the control apparatus increases an opening degree of the throttle valve or maintains the opening degree at a constant value until the detected speed is equal to a predetermined speed which is smaller than the prescribed value, and the control apparatus decreases the opening degree of the throttle valve if the detected speed exceeds the predetermined speed which is smaller than the prescribed value. ### Claim 2 (depends on 1) The straddle-type vehicle of claim 1, wherein the control apparatus gradually decreases the opening degree of the throttle valve if the detected speed exceeds the predetermined speed. ### Claim 3 (depends on 1) The straddle-type vehicle of claim 1, wherein the predetermined speed is constant irrespective of the operation amount of the accelerator operating element. ### Claim 4 (depends on 1) The straddle-type vehicle of claim 1, further comprising a transmission having a plurality of transmission gears, wherein at least two transmission gears have different predetermined speeds. ### Claim 5 (depends on 1) The straddle-type vehicle of claim 1, further comprising a storage device in which maps of respective transmission gears concerning an accelerator opening degree, a throttle opening degree, and detected speed are stored, wherein the control apparatus sends a control signal to decrease the opening degree of the throttle valve in accordance with the stored maps. ### Claim 6 A throttle control apparatus, comprising: a plurality of detectors, at least one of the detectors being configured to detect the rotational speed of an engine; a memory module; and a fuel supply controller which receives input from the plurality of detectors and the memory module, and controls the opening degree of a throttle valve based on values detected by the detectors, wherein the opening degree of the throttle valve is increased or maintained at a constant value until the detected speed is equal to a predetermined speed which is smaller than a prescribed value, and the opening degree of the throttle valve is decreased if the detected speed exceeds the predetermined speed which is smaller than the prescribed value. ### Claim 7 (depends on 6) The throttle control apparatus of claim 6, wherein the plurality of detectors includes an engine rotating speed detector. ### Claim 8 (depends on 6) The throttle control apparatus of claim 6, wherein the plurality of detectors includes a throttle opening degree detector. ### Claim 9 (depends on 6) The throttle control apparatus of claim 6, wherein the plurality of detectors includes a vehicle speed detector. ### Claim 10 (depends on 6) The throttle control apparatus of claim 6, wherein the plurality of detectors includes an accelerator opening degree detector. ### Claim 11 (depends on 6) The throttle control apparatus of claim 6, wherein the plurality of detectors includes a transmission gear detector. ### Claim 12 (depends on 6) The throttle control apparatus of claim 6, wherein the fuel supply controller controls the opening degree of the throttle valve based on a map of control values stored in the memory module.