Method and apparatus for detecting engine firing in a hybrid powertrain system
AssigneeGM Global Technology Operations LLC
InventorsAllen J. Lehmen, Kevin J. Smith, James B. Nicholson
Life of this patent
Estimating the term…
Abstract
A method for controlling a hybrid powertrain system includes commanding engine operation to transition from an engine-off state to an engine-on state. A control scheme detects engine firing based upon input speed, input torque and a change in the input torque.
Claims11
Method for controlling a powertrain system including an internal combustion engine coupled via an input member to a hybrid transmission including a torque machine, the hybrid transmission configured to transfer torque between the engine, the torque machine, and an output member, the method comprising:
- commanding engine operation to transition from an engine-off state to an engine-on state;
- spinning the engine and subsequently fueling the engine;
- monitoring an input speed and determining an input torque from the engine to the input member;
- detecting the engine is firing when the input speed is greater than an input flare speed;
- detecting the engine is firing when the input torque is a positive value, the input torque is increasing, and a time-rate change in the input torque exceeds a threshold;
- and
- detecting the engine is firing when the input torque is greater than a threshold after a calibrated time period.
Method for controlling a powertrain system including an internal combustion engine coupled to a hybrid transmission including a torque machine, the hybrid transmission configured to transfer torque between the engine, the torque machine, and an output member, the method comprising:
- commanding an engine starting event;
- spinning the engine and then fueling the engine;
- monitoring an input speed and determining an input torque from the engine to the hybrid transmission;
- and
- determining that the engine did not start and run only when the input speed fails to exceed an input flare speed, and the input torque is less than a threshold after a calibrated time period.
Method for controlling a powertrain system including an internal combustion engine coupled to a hybrid transmission including first and second torque machines, the hybrid transmission configured to transfer torque between the engine, the first and second torque machines and an output member, the method comprising:
- commanding engine operation to transition from an engine-off state to an engine-on state;
- spinning the engine and then fueling the engine;
- monitoring an input speed and determining an input torque from the engine to the hybrid transmission;
- providing a first engine firing diagnostic effective to detect the engine is firing when the input speed is greater than an input flare speed;
- providing a second engine firing diagnostic effective to detect the engine is firing when the input torque is a positive value, the input torque is increasing, and a time-rate change in the input torque exceeds a threshold;
- providing a third engine firing diagnostic effective to detect the engine is firing when the input torque is greater than a threshold after a calibrated time period;
- and
- performing the first engine firing diagnostic and subsequently performing the second engine firing diagnostic only when performance of the first engine firing diagnostic does not detect the engine is firing and subsequently performing the third engine firing diagnostic only when performance the second engine firing diagnostic does not detect the engine is firing.
Dependencies are inferred from the claim text.