System and method for controlling boost during engine cold start
An engine and cold start technology, which is applied in the direction of engine control, engine start, engine electric motor start, etc., can solve the problems that cannot be realized, the system battery cannot accept power, and increase the engine load, etc.
Pending Publication Date: 2021-03-02
FORD GLOBAL TECH LLC
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Problems solved by technology
As an example, when the state of charge (SOC) of the system battery is greater than a threshold amount (e.g., the system battery is fully charged), the system battery may not be able to accept additional charge
As a result, the SOC of the system battery at engine start may not allow for the extended charge that can occur when the electric motor / generator is used to increase engine load and thereby enable catalyst light-off
Method used
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[0015] The following description pertains to applications such as figure 1 A system and method for adjusting engine load using an electric machine as a generator in a boosted engine system. The controller may be configured to execute a control program to adjust engine load whereby one or more received inputs may be processed to generate one or more outputs such as figure 2 shown. For example, the control program can be in Figure 3A and Figure 3B A method for using an electric machine as a generator to regulate engine load during an engine cold start is described here. where the control program can be such as by using the Figure 4 The map depicted here finds the maximum compressor pressure ratio based on the target mass air flow of the electric booster. Figure 5 to Figure 7 A prophetic example is shown at , which shows the coordinated operation of the electric machine and the electric booster during an engine cold start.
[0016] now refer to figure 1 , schematicall...
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The present invention provides a system and method for controlling boost during engine cold start. Systems and methods are provided for using an electric machine as a generator to control boost duringan engine cold start. In one example, a method may include receiving a request to increase an engine load during the engine cold start, determining an available capacity of a battery, operating the electric machine as the generator to increase the engine load with an electrical load, and responsive to the available capacity of the battery being less than a charge threshold, charging the battery with the electrical load while generating an increased boost pressure with an electric boosting device by powering the electric boosting device via the battery, and coordinating an amount of the increased boost pressure to compensate the electrical load. By increasing the engine load during the engine cold start, an exhaust gas temperature may be increased to achieve catalyst light-off.
Description
technical field [0001] The present description generally relates to systems and methods for operating an electric machine in a vehicle, and in particular for using the electric machine as a generator to control boost during engine cold start. Background technique [0002] Diesel engines can provide high torque and improve fuel economy compared to gasoline engines. However, the temperature of diesel exhaust is lower than that of many gasoline engines. Consequently, after a cold engine start, it may take longer for the catalyst in the exhaust system of a diesel engine to reach a temperature threshold (eg, catalyst light-off temperature) for high catalyst efficiency. Additionally, many diesel engines are turbocharged to increase engine output, and exhaust heat is extracted by the turbocharger. Therefore, less exhaust heat is available for lighting the catalyst. Due to the extended amount of time before the catalyst reaches its light-off temperature, vehicle emissions may inc...
Claims
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Patent Timeline
Login to View More IPC IPC(8): F02D41/00F02B39/10F02D41/02B60W20/15B60W10/06B60W10/08
CPCB60W10/06B60W10/08B60W20/15F02B39/10F02D41/0007F02D41/0255F02D2041/026F02D41/064F02N11/04Y02T10/12F02N11/0862F02N2200/022F02N2200/061
Inventor 埃里克·马修·库尔茨贾森·布莱恩·马茨萨西什·马卡帕蒂
Owner FORD GLOBAL TECH LLC