Engine control device
First Claim
1. An engine comprising a throttle valve configured to adjust an amount of air supplied to the engine, an operating member, an operation amount detecting device configured to detect an operation amount of the operating member, a motor configured to drive the throttle valve between open and closed positions according to a detection value detected by the operation amount detecting device, a throttle opening detecting device configured to detect an opening of the throttle valve, a limp-home mechanism configured to keep the opening of the throttle valve in a mechanically neutral position when an abnormality occurs in which a normal throttle opening control for the throttle valve is not available, an ignition timing control device configured to switch an ignition timing control for the engine from a regular ignition timing control to a limp-home ignition timing control conducted according to an amount of intake air with the opening of the throttle valve in the mechanically neutral position when the opening of the throttle valve is in the mechanically neutral position due to occurrence of the abnormality, and an ignition timing control changing device configured to change the ignition timing control stepwise through a plurality of steps over a predetermined time period, when the ignition timing control conducted by the ignition timing control device is switched from the regular ignition timing control to the limp-home ignition timing control.
3 Assignments
0 Petitions
Accused Products
Abstract
An engine control device can include a throttle valve for adjusting an amount of air supplied to an engine, operation amount detecting sensors for detecting an operation amount of a throttle lever, a motor for driving the throttle valve between open and closed positions according to detection values of the operation amount detecting sensor 21a or the like, and throttle opening detecting sensors for detecting an opening of the throttle valve is provided with a limp-home mechanism for keeping the throttle valve in a mechanically neutral position when an abnormality occurs. When the throttle valve is in the mechanically neutral position, an ignition timing control can be switched in a stepwise manner over a predetermined time period from a regular ignition timing control to a limp-home ignition timing control.
33 Citations
12 Claims
- 1. An engine comprising a throttle valve configured to adjust an amount of air supplied to the engine, an operating member, an operation amount detecting device configured to detect an operation amount of the operating member, a motor configured to drive the throttle valve between open and closed positions according to a detection value detected by the operation amount detecting device, a throttle opening detecting device configured to detect an opening of the throttle valve, a limp-home mechanism configured to keep the opening of the throttle valve in a mechanically neutral position when an abnormality occurs in which a normal throttle opening control for the throttle valve is not available, an ignition timing control device configured to switch an ignition timing control for the engine from a regular ignition timing control to a limp-home ignition timing control conducted according to an amount of intake air with the opening of the throttle valve in the mechanically neutral position when the opening of the throttle valve is in the mechanically neutral position due to occurrence of the abnormality, and an ignition timing control changing device configured to change the ignition timing control stepwise through a plurality of steps over a predetermined time period, when the ignition timing control conducted by the ignition timing control device is switched from the regular ignition timing control to the limp-home ignition timing control.
- 6. An engine comprising a throttle valve configured to adjust an amount of air supplied to the engine, an operating member, at least a pair of operation amount detecting devices configured to detect an operation amount of the operating member, a motor configured to move the throttle valve between open and closed positions according to a detection value detected by the operation amount detecting device, at least a pair of throttle opening detecting devices configured to detect an opening of the throttle valve, a limp-home mechanism configured to maintain the opening of the throttle valve in a mechanically neutral position when an abnormality occurs in which a normal throttle opening control for the throttle valve is not available, an ignition timing control device configured to switch an ignition timing control for the engine from a regular ignition timing control to a limp-home ignition timing control conducted according to an amount of intake air with the opening of the throttle valve in the mechanically neutral position when the opening of the throttle valve is in the mechanically neutral position due to occurrence of the abnormality, and limp-home ignition timing changing means for changing a rotational speed of the engine, when the ignition timing control conducted by the ignition timing control device is switched to the limp-home ignition timing control due to occurrence of the abnormality resulting from a malfunction of any one of the pair of operation amount detecting devices or the pair of throttle opening detecting devices, by changing the ignition timing according to a detection value detected by at least one of the pair of operation amount detecting devices not malfunctioning.
Specification