Electronic control of engine braking cycle
First Claim
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1. A method of engine braking comprising the steps of:
- determining whether fuel injector tip temperatures are at or above a predetermined temperature;
if the injector tip temperatures are at or above the predetermined temperature, then perform single event engine braking; and
if the injector tip temperatures are below the predetermined temperature, then perform dual event engine braking.
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Abstract
A method of engine braking includes a initial step of determining whether fuel injector tip temperatures are at or above a pre-determined temperature. If the injector tip temperatures are below the pre-determined temperature, then the electronic control module commands performance of dual event engine braking. If the injector tip temperatures are at or above the pre-determined temperatures, then the electronic control module commands the performance of single event engine braking. Such a strategy can achieve higher overall engine braking horsepower without risking the potential catastrophic dangers associated with injector tip overheating.
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Citations
20 Claims
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1. A method of engine braking comprising the steps of:
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determining whether fuel injector tip temperatures are at or above a predetermined temperature;
if the injector tip temperatures are at or above the predetermined temperature, then perform single event engine braking; and
if the injector tip temperatures are below the predetermined temperature, then perform dual event engine braking. - View Dependent Claims (2, 3, 4, 5, 6, 7)
measuring at least one variable that is correlated to injector tip temperature; and
estimating the injector tip temperatures based upon said at least one variable.
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3. The method of claim 2 wherein said at least one variable includes at least one of engine speed, exhaust temperature and number of previous engine braking cycles.
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4. The method of claim 2 wherein said estimating step includes a step of accessing a look-up table.
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5. The method of claim 1 including a step of advancing a blow down timing if a turbine speed is above a predetermined maximum turbine speed.
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6. The method of claim 1 including the steps of advancing a blow down timing if an expected engine braking noise level exceeds a predetermined maximum noise level.
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7. The method of claim 1 including the steps of:
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determining a tempering temperature of the injector tips; and
setting the predetermined temperature below the tempering temperature.
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8. A work machine comprising:
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a work machine housing;
an engine attached to said work machine housing;
a plurality of electronically controlled engine brake actuators attached to said engine;
a plurality of fuel injectors attached to said engine;
an electronic control module in control communication with said plurality of electronically controlled engine brake actuators; and
said electronic control module including means for transitioning from dual event engine braking to single event engine braking when tips of said fuel injectors are at or above a predetermined temperature. - View Dependent Claims (9, 10, 11, 12)
means for estimating the injector tip temperatures based upon said at least one variable.
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10. The work machine of claim 9 wherein said at least one variable includes at least one of engine speed, exhaust temperature and number of previous engine braking cycles.
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11. The work machine of claim 8 including a turbine attached to said engine;
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a means for advancing a blow down timing if a turbine speed is above a predetermined maximum turbine speed.
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12. The vehicle of claim 8 including a means for advancing a blow down timing if an expected exhaust braking noise level exceeds a predetermined maximum noise level.
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13. An electronic control module comprising:
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means for determining whether fuel injector tip temperatures are at or above a predetermined temperature;
means for commanding single event engine braking if the injector tip temperatures are at or above the predetermined temperature; and
means for commanding dual event engine braking if the injector tip temperatures are below the predetermined temperature. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
means for estimating the injector tip temperatures based upon said at least one variable.
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15. The electronic control module of claim 14 wherein said at least one variable includes at least one of engine speed, exhaust temperature and number of previous engine braking cycles.
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16. The electronic control module of claim 14 wherein said means for estimating includes a means for accessing a look-up table.
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17. The electronic control module of claim 13 including a means for advancing a blow down timing if a turbine speed is above a predetermined maximum turbine speed.
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18. The electronic control module of claim 13 including a means for advancing a blow down timing if an expected engine braking noise level exceeds a predetermined maximum noise level.
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19. The electronic control module of claim 13 including a means for commanding an activation and deactivation of an electronically controlled engine brake actuator.
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20. The electronic control module of claim 13 including means for increasing boost pressure in an exhaust line at least in part by commanding an adjustment to a variable geometry turbine.
Specification