Source: https://patents.google.com/patent/US20080306653A1/en
Timestamp: 2019-05-21 15:27:41
Document Index: 669904507

Matched Legal Cases: ['application no, 2006', 'art 3', 'art 11', 'art 11', 'art 11', 'art 11', 'art 11', 'art 11', 'art 11', 'art 11', 'art 11', 'art 11']

US20080306653A1 - Engine Control Apparatus and Straddle-Type Vehicle - Google Patents
Engine Control Apparatus and Straddle-Type Vehicle Download PDF
US20080306653A1
US20080306653A1 US11/953,564 US95356407A US2008306653A1 US 20080306653 A1 US20080306653 A1 US 20080306653A1 US 95356407 A US95356407 A US 95356407A US 2008306653 A1 US2008306653 A1 US 2008306653A1
US11/953,564
US8352122B2 (en
2006-12-11 Priority to JP2006-333642 priority Critical
2006-12-11 Priority to JP2006333642A priority patent/JP5089972B2/en
2007-12-10 Application filed by Yamaha Motor Co Ltd filed Critical Yamaha Motor Co Ltd
2008-08-25 Assigned to YAMAHA HATSUDOKI KABUSHIKI KAISHA reassignment YAMAHA HATSUDOKI KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HASEGAWA, TAKAHIKO
2008-12-11 Publication of US20080306653A1 publication Critical patent/US20080306653A1/en
2013-01-08 Publication of US8352122B2 publication Critical patent/US8352122B2/en
An engine control apparatus that effectively suppresses a rise in rotation number of an engine in a jump of a vehicle. An engine control apparatus includes an acceleration detecting device for detecting an acceleration component of gravity acceleration in a perpendicular direction of the vehicle body based on a signal inputted from an acceleration sensor, and a control circuit for judging whether the vehicle has jumped or not based on the acceleration component to be detected. The control circuit suppresses a rise in rotation number of the engine when the vehicle is judged to have jumped.
This application claims the benefit of priority under 35 USC 119 of Japanese patent application no, 2006-333642, filed on Dec. 11, 2006, which application is hereby incorporated by reference in its entirety.
In view of the above problem, the invention provides an engine control apparatus that effectively suppresses a rise in rotation number of an engine in jumping.
FIG. 1 is a side view of a motorcycle having an engine control apparatus in accordance with an embodiment of the invention.
An embodiment of the invention is now described with reference to the drawings. FIG. 1 is a side view of a motorcycle 1 to which an engine control apparatus 10 is mounted. Motorcycle 1 comprises engine control apparatus 10, an engine 20 and a body frame 3.
Body frame 3 has a main frame 3 b that extends rearward from steering head part 3 a and curves downward. Engine 20 is provided under main frame 3 b. Driving force outputted from engine 20 is transmitted to a rear wheel 7 through a driving force transmission mechanism 26 (a chain in this case). Engine 20 includes an ignition plug 21 for igniting a mixed gas of fuel and air, which are supplied to a cylinder 20 a.
An intake port of engine 20 is connected to a throttle body 25 supplied with air from an air cleaner. An injector 22 for injecting fuel into an intake path is fitted to throttle body 25. Throttle body 25 mixes fuel injected from injector 22 with air supplied from the air cleaner and supplies engine 20 with the mixture.
Acceleration sensor 13 may be an electrostatic capacity type acceleration sensor using a semiconductor, for example, and may use a piezoelectric element. In this embodiment, acceleration sensor 13 has two orthogonal directions as detection directions: a perpendicular direction (direction of height) and a lateral direction (direction of width) of the vehicle body. Acceleration sensor 13 outputs a signal corresponding to an acceleration component of gravity acceleration in the perpendicular direction and the lateral direction to subtraction circuit 15 c and high-pass filter circuit 15 a.
While acceleration sensor 13 is described as using a semiconductor, it could also be, for example, a pendulum type acceleration sensor. Moreover, acceleration sensor 13 may be a triaxial sensor for detecting acceleration in three directions or two single-axis sensors instead of a biaxial sensor for detecting acceleration in two directions. In the case that acceleration sensor 13 is a triaxial sensor, two directions of three detection directions are set at the perpendicular direction and the lateral direction, for example.
FIG. 4 is a block diagram of a process executed by control circuit 11. Control circuit 11 includes a jump judging part 11 a, a permissible rotation number setting part 11 b, a rotation number suppressing control part 11 c, a turnover judging part 11 d and a turnover corresponding control part 11 e.
Jump judging part 11 a judges whether the vehicle has jumped or not based on an acceleration component of gravity acceleration, which is detected by acceleration sensor 13. A jump judging process by jump judging part 11 a is executed as described below.
Turnover judging part 11 d may judge whether the vehicle is turned over or not based on a rolling angle of the vehicle body. That is, turnover judging part 11 d calculates a value that is obtained by dividing acceleration Alr of the vehicle body in lateral direction D2 by acceleration component Adown in perpendicular direction D1, as a tangent value “tan” (θ) of rolling angle θ of the vehicle body (tan(θ)=Alr/Adown; refer to FIG. 6). The vehicle may be judged as having been turned over when tangent value tan(θ) is larger than a predetermined threshold value (referred to as a turnover judgment reference value, hereinafter) and the vehicle is judged not to be in a jump. The above turnover judgment reference value is a tangent value of a limit value (70°, for example) of the rolling angle in the case of normal running of the vehicle. This more certainly prevents an error in judgment between a jump and turnover from occurring.
Furthermore, in engine control apparatus 10, control circuit 11 decreases the permissible rotation number of engine 20 when the vehicle is judged to have jumped. What is subject to control in jumping, however, is not limited to the above. For example, an adjusting mechanism for electromagnetically varying attenuation force (restoration force) of front suspension 5 may be provided so that control circuit 11 can vary the attenuation force of front suspension 5 in accordance with a result of the judgment by jump judging part 11 a.
FIG. 8 is a block diagram of an engine control apparatus 100 in accordance with this embodiment. FIG. 9 is a functional block diagram of control circuit 110 in accordance with the embodiment. In FIGS. 8 and 9, structure already described is marked with the same reference sings and numerals and omitted from description.
an acceleration detecting means for detecting an acceleration component of gravity acceleration in a predetermined direction of a vehicle;
a jump judging means for judging whether the vehicle has jumped or not on the basis of the acceleration component detected by the acceleration detecting means; and
a rotation number rise suppression processing means for suppressing a rise in rotation number of an engine when the jump judging means judges that the vehicle has jumped.
the jump judging means judges that the vehicle has jumped when acceleration satisfying a predetermined condition is continuously detected.
a turnover judging means for judging whether the vehicle has been turned over or not based on an acceleration component detected by the acceleration detecting means and a result of judgment by the jump judging means.
an adjusting mechanism for electromagnetically varying attenuation force of a suspension; and
a suspension control means for varying the attenuation force of the suspension obtained by the adjusting mechanism based on a result of judgment by the jump judging means.
5. A straddle-type vehicle with the engine control apparatus according to claim 1.
US11/953,564 2006-12-11 2007-12-10 Engine control apparatus and straddle-type vehicle Active 2031-06-06 US8352122B2 (en)
JP2006-333642 2006-12-11
JP2006333642A JP5089972B2 (en) 2006-12-11 2006-12-11 Engine control unit, and a straddle-type vehicle
US20080306653A1 true US20080306653A1 (en) 2008-12-11
US8352122B2 US8352122B2 (en) 2013-01-08
ID=39605128
US11/953,564 Active 2031-06-06 US8352122B2 (en) 2006-12-11 2007-12-10 Engine control apparatus and straddle-type vehicle
US (1) US8352122B2 (en)
JP (1) JP5089972B2 (en)
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Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HASEGAWA, TAKAHIKO;REEL/FRAME:021437/0249