Direct injection type engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsHiroki Murata, Shizuo Sasaki, Kohei Igarashi
Life of this patent
Estimating the term…
Abstract
A direct injection type engine comprising a variable speed transmission. Engine control lines indicating the relationship between the engine rotational speed and required torque necessary for obtaining a required output are comprised of a first control line and a second control line at the high torque side and low speed side of the first control line. When the degree of activation of the exhaust gas purification device is low, the required torque and the engine rotational speed are made ones on the first control line in accordance with the required output, while when the degree of activation is high, the required torque and the engine rotational speed are made ones on the second control line in accordance with the required output.
Claims17
A direct injection type engine provided with an exhaust passage, comprising:
- a variable speed transmission connected with the engine and able to freely change a gear ratio;
- an exhaust purification device arranged in the exhaust passage;
- and
- a control device for controlling a torque generated by the engine and a gear ratio of the variable speed transmission;
- at least two control lines which include a first control line and a second control line at a high torque side and low speed side of the first control line in the same required output being set as engine control lines showing the relationship between the engine rotational speed and required torque required for obtaining a required output, said control device causing the engine to generate a required torque on the first control line in accordance with the required output and controlling the gear ratio of the variable speed transmission to give an engine rotational speed on the first control line in accordance with the required output when the extent of activation of the exhaust purification device is low, said control device causing the engine to generate a required torque on the second control line in accordance with the required output and controlling the gear ratio of the variable speed transmission to give an engine rotational speed on the second control line in accordance with the required output when the extent of activation of the exhaust purification device is high;
- wherein under an engine rotational speed and required torque on the second control line, the fuel economy is better than by the first control line, but the amount of harmful components in the exhaust gas becomes greater.
A direct injection type engine provided with an exhaust passage, comprising:
- a transmission connected with the engine and having a plurality of speeds automatically changeable;
- an exhaust purification device arranged in the exhaust passage;
- and
- a control device for changing a speed of the transmission;
- first boundary lines and second boundary lines at a lower vehicle speed side than the first boundary lines being set as speed boundary lines indicating the relationship between representative values of the required torque and representative values of the vehicle speed at boundaries of different speeds, said control device changing the speeds at the first boundary lines when the degree of activation of the exhaust gas purification device is low and changing the speeds at the second boundary lines when the degree of activation of the exhaust gas purification device is high.
Dependencies are inferred from the claim text.