System for deactivating engine cylinders
Systems and methods for operating an engine with deactivating and non-deactivating valves is presented. In one example, the engine may include non-deactivating intake valves, deactivating intake valves, and only non-deactivating exhaust valves. The non-deactivating exhaust valves may operate to open and close during an engine cycle while deactivating intake valves remain closed during the engine cycle to prevent air flow through selected engine cylinders.
1. An engine system, comprising:
an engine including a first cylinder with a first intake valve and a first exhaust valve, the engine including a second cylinder with a second intake valve and a second exhaust valve;
a first camshaft in mechanical communication with the first intake valve via a first deactivating valve operator;
a first non-deactivating valve operator providing mechanical communication between the first exhaust valve and a second camshaft;
a turbocharger and a controller including executable instructions stored in non-transitory memory for increasing boost pressure from the turbocharger in response to a request to deactivate the first intake valve via the first deactivating valve operator; and
additional instructions to increase overlap between the first intake valve and the first exhaust valve in response to a turbocharger waste gate position one cylinder cycle before the request to deactivate the first intake valve.
2. The engine system of claim 1 , further comprising the second exhaust valve in mechanical communication with the second camshaft via a second non-deactivating valve operator.
3. The engine system of claim 2 , further comprising the second intake valve in mechanical communication with the first camshaft via a third non-deactivating valve operator.
4. The engine system of claim 3 , further comprising executable instructions stored in non-transitory memory to deactivate fuel flow to the first cylinder in an engine cycle while fuel is delivered to the second cylinder in the engine cycle in response to a request to deactivate the first cylinder.
5. The engine system of claim 2 , further comprising instructions to sample an exhaust gas oxygen sensor in via a first method in response to deactivating the first cylinder and sample the exhaust gas oxygen sensor via a second method in response to activating the first cylinder.
6. The engine system of claim 5 , further comprising a third cylinder including a third intake valve and a third exhaust valve, the third exhaust valve in mechanical communication with the second camshaft via a second deactivating valve operator, the third intake valve in mechanical communication with the first camshaft via a fourth non-deactivating valve operator.
7. The engine system of claim 6 , further comprising instructions to activate the first cylinder and deactivate the third cylinder during an engine cycle.
8. The engine system of claim 1 , where the second exhaust valve is in mechanical communication with a third non-deactivating valve operator.
9. The engine system of claim 1 , where the first deactivating valve operator is a lever.
10. The engine system of claim 1 , where the first deactivating valve operator is a cam lobe.
11. The engine system of claim 1 , where the first deactivating valve operator is a lash adjuster.
12. A vehicle system, comprising:
an engine including a first cylinder hank and a second cylinder bank, the first cylinder bank including a first and second cylinder, the second cylinder hank including a third cylinder and a fourth cylinder;
a first deactivating valve operator in mechanical communication with an intake valve of the first cylinder and a first camshaft;
a first non-deactivating valve operator in mechanical communication with an exhaust valve of the first cylinder and a second camshaft;
a second non-deactivating valve operator in mechanical communication with an intake valve of the second cylinder and the first camshaft;
a third non-deactivating valve operator in mechanical communication with an exhaust valve of the second cylinder and the second camshaft;
a second deactivating valve operator in mechanical communication with an intake valve of the third cylinder and a third camshaft;
a fourth non-deactivating valve operator in mechanical communication with an exhaust valve of the third cylinder and a fourth camshaft;
a fifth non-deactivating valve operator in mechanical communication with an intake valve of the fourth cylinder and the third camshaft; and
a sixth non-deactivating valve operator in mechanical communication with an exhaust valve of a fourth cylinder and a fourth camshaft.
13. The vehicle system of claim 12 , further comprising a controller including executable instructions stored in non-transitory memory to deactivate fuel flow to the first cylinder in an engine cycle while fuel is delivered to the second cylinder in the engine cycle in response to a request to deactivate the first cylinder.
14. The vehicle system of claim 13 , further comprising additional instructions to sample an exhaust gas oxygen sensor in via a first method in response to deactivating the first cylinder and sample the exhaust gas oxygen sensor via a second method in response to activating the first cylinder.
15. The vehicle system of claim 12 , further comprising a turbocharger and a controller including executable instructions stored in non-transitory memory for increasing boost pressure from the turbocharger in response to a request to deactivate the first cylinder.
16. The vehicle system of claim 15 , further comprising instructions to adjust a compressor bypass valve in response to deactivating the first cylinder.
17. The vehicle system of claim 16 , where adjusting the compressor bypass valve includes decreasing an opening amount of the compressor bypass valve.