Method and device for controlling an internal-combustion engine before a starting operation
View Patent ↗A method and device are provided for limiting, in a first operating condition, a motor vehicle internal-combustion engine torque. The operating condition, resulting from an operation of a motor vehicle brake, when the engine torque is simultaneously demanded by a driver's intention indicator, differs from a second operating condition, in which the brake is not operated. The limiting takes place at least partially by way of a controlled reduction of an advance angle efficiency in the first operating condition in comparison to the second operating condition.
1. A method of limiting, in a first operating condition, a motor vehicle internal-combustion engine torque, comprising establishing the first operating condition as a result of a brake operation when the torque is simultaneously demanded by a driver's intention indicator, said first operating condition differing from a second operating condition in which the brake is not operated, and limiting the torque at least partially by a controlled reduction of an advance angle efficiency in the first operating condition in comparison to the second operating condition, the limiting also taking place by limitation of charges of internal-combustion engine combustion chambers.
2. The method according to claim 1 , wherein reduction of the advance angle efficiency takes place by reduction of an angular distance between ignitions and an upper dead center of an internal-combustion engine piston movement.
3. The method according to claim 1 , wherein reduction of the advance angle efficiency takes place by a reduction of an angular distance between ignitions and an upper dead center of an internal-combustion engine piston movement.
4. The method according to claim 1 , wherein a torque loss resulting from the reduction of the advance angle efficiency is gradually reduced in the first operating condition, while a torque loss resulting from the limitation of charges is gradually increased in the first operating condition.
5. The method according to claim 1 , wherein a torque loss resulting from the limitation of charges is gradually reduced in the first operating condition, while a torque loss resulting from the reduction of the advance angle efficiency is gradually increased in the first operating condition.
6. The method according to claim 5 , wherein, after the expiration of a definable maximal time duration, the torque loss resulting from the reduction of the advance angle efficiency is gradually reduced in the first operating condition while the torque loss resulting from the limitation of charges is gradually increased in the first operating condition.
7. The method according to claim 1 , wherein the limiting takes place only when a motor vehicle driving speed is lower than a driving speed threshold value.
8. The method according to claim 1 , wherein limitation of an internal combustion engine rotational speed to a maximal value also occurs in the first operating condition.
9. A motor vehicle internal-combustion engine control device, comprising means for, in a first operating condition, limiting internal-combustion engine torque, said first operating condition, as a result of an operation of a brake when the torque is simultaneously demanded by a driver's intention indicator, differing from a second operating condition in which the brake is not operated, the limiting also taking place by limitation of charges of internal-combustion engine combustion chambers, and means for reducing an advance angle efficiency in the first operating condition in comparison to the second operating condition.
10. The control device according to claim 9 , wherein reduction of the advance angle efficiency takes place by reduction of an angular distance between ignitions and an upper dead center of an internal-combustion engine piston movement.
11. The control device according to claim 9 , wherein a torque loss resulting from the reduction of the advance angle efficiency is gradually reduced in the first operating condition, while a torque loss resulting from the limitation of charges is gradually increased in the first operating condition.
12. The control device according to claim 9 , wherein a torque loss resulting from the limitation of charges is gradually reduced in the first operating condition, while a torque loss resulting from the reduction of the advance angle efficiency is gradually increased in the first operating condition.
13. The control device according to claim 12 , wherein, after the expiration of a definable maximal time duration, said torque loss resulting from the reduction of the advance angle efficiency is gradually reduced in the first operating condition, while said torque loss resulting from the limitation of charges is gradually increased in the first operating condition.
14. The control device according to claim 9 , wherein the limiting takes place only when a motor vehicle driving speed is lower than a driving speed threshold value.
15. The control device according to claim 9 , wherein a limitation of an internal-combustion engine rotational speed to a maximal value also occurs in the first operating condition.