Why do German car companies dare not give Chinese car companies some technology patents?

The technologies of German car companies are mainly in diesel technology and some technologies that improve the luxury quality of cars. As for the fuel-saving, durable and safety technologies of engine gearboxes, Germany has nothing that it can offer to China. Engine technology Good Honda, features fuel-saving, durable, high horsepower, better gearbox than Aisin, cheap, durable, fuel-efficient and quick response.