Control method for ignition system
AssigneeDenso Corporation
InventorShigeyuki Ohira
Life of this patent
Estimating the term…
Abstract
A rotor has teeth on a rotor body. The teeth indicate fixed ignition timings for both of normal and reverse rotations. The teeth also indicate beginning positions of a calculation ignition sequence and an excess advanced ignition sequence for both of the normal and reverse rotations. One of the teeth is longer than the other teeth to provide a signal for determining a rotating direction based on a detected signal from a timing sensor. In a stable rotating condition, a countdown process begins when the beginning position located on the forward side in the rotating direction from the cylinder to be ignited is detected, and the spark plug of the target cylinder sparks when the counting process finished.
Claims20
A control method for an ignition system for an engine being capable of rotating in both of normal and reverse directions and has at least one cylinder, the ignition system comprising a rotor, a sensor and a controller, the rotor being rotated synchronously with the engine and having a position indicator for determining a fixed ignition timing of the cylinder in the normal and reverse rotation and calculation indicators defining beginnings of a calculation of a calculation ignition, the calculation indicators being located on a forward side of the position indicator in the normal rotation and a forward side of the position indicator in the reverse rotation, the sensor detecting the position indicator and the calculation indicators, and the controller controlling ignition timings of an ignition device and determining rotating direction of the rotor based on a detected signal of the position indicator and the calculation indicators outputted from the sensor, the method comprising the steps of:
- beginning a calculation in response to a detection of the calculation indicator corresponding to each cylinder by the sensor;
- and
- commanding an ignition on the cylinder corresponding to the calculation indicator in response to a finish of the calculation.
An ignition system for an engine being capable of rotating in both of normal and reverse directions and has at least one cylinder, the ignition system comprising:
- an ignition device for providing ignitions in the cylinder;
- a rotor being rotated synchronously with the engine having a plurality of indicators;
- a sensor for detecting the indicators on the rotor;
- and
- a controller for controlling ignition timings of an ignition device and determining rotating direction of the rotor based on a detected signal outputted from the sensor, wherein
- the indicators on the rotor are located on both sides of a top dead center for defining fixed ignition timings in both of the normal and reverse rotation and for defining beginnings of a calculation of a calculation ignition, and wherein
- the controller includes:
- a fixed ignition means for commanding an ignition to the ignition device in response to a detection of the indicator located before the top dead center;
- and
- a calculation ignition means for commanding an ignition to the ignition device in response to a finish of a calculation which is started in response to a detection of the indicator located before the indicator that defines a fixed ignition timing by the fixed ignition means.
Dependencies are inferred from the claim text.