Transmitting state switching control apparatus for hybrid vehicle
First Claim
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1. An apparatus for controlling a hybrid vehicle having an engine, a motor-generator, and clutch disposed between the engine and the motor and configured to vary a transmitted torque capacity, comprising:
- a transmission disposed between the motor-generator and at least one driving wheel having at least two power transmitting paths through the selective engagement of a plurality of frictional engagement elements; and
a controller configured to;
perform a transition of the vehicle from an electric running mode wherein the clutch is disengaged to a hybrid running mode wherein the clutch is engaged and the engine is started, the transition responsive to a request for start up of the engine;
determine a need for a shift of the transmission responsive to a request for driving force for the vehicle, at least a first frictional engagement element changing from being engaged before the shift to being disengaged after the shift or changing from being disengaged before the shift to being engaged after the shift;
responsive an earlier of a determination of the need for the shift and the request for start up of the engine, permit a first slip state where one of the first frictional engagement element and a second frictional engagement element is allowed to slip while the other of the first frictional engagement element and the second frictional engagement element is not allowed to slip;
during the transition, perform a switch to permit a second slip state where the other of the first frictional engagement element and the second frictional engagement element is allowed to slip and the one of the first frictional engagement element and the second frictional engagement element allowed to slip in the first slip state is not allowed to slip, each of the first slip state and the second slip state controlling the driving force transmitted to the at least one driving wheel; and
complete the shift by preventing both the first frictional engagement element and the second frictional engagement element from slipping.
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Abstract
A control apparatus for a hybrid vehicle for controlling and limiting the transmission of power from an engine to the driving wheels during start-up of the engine to produce a hybrid running mode where the vehicle is powered by both the engine and a motor-generator. During start-up of the engine, a first frictional element changing its state before and after a shift of the transmission is allowed to slip, and a second frictional element is allowed to slip. The element that is allowed to slip is switched from one to the other.
85 Citations
20 Claims
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1. An apparatus for controlling a hybrid vehicle having an engine, a motor-generator, and clutch disposed between the engine and the motor and configured to vary a transmitted torque capacity, comprising:
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a transmission disposed between the motor-generator and at least one driving wheel having at least two power transmitting paths through the selective engagement of a plurality of frictional engagement elements; and a controller configured to; perform a transition of the vehicle from an electric running mode wherein the clutch is disengaged to a hybrid running mode wherein the clutch is engaged and the engine is started, the transition responsive to a request for start up of the engine; determine a need for a shift of the transmission responsive to a request for driving force for the vehicle, at least a first frictional engagement element changing from being engaged before the shift to being disengaged after the shift or changing from being disengaged before the shift to being engaged after the shift; responsive an earlier of a determination of the need for the shift and the request for start up of the engine, permit a first slip state where one of the first frictional engagement element and a second frictional engagement element is allowed to slip while the other of the first frictional engagement element and the second frictional engagement element is not allowed to slip; during the transition, perform a switch to permit a second slip state where the other of the first frictional engagement element and the second frictional engagement element is allowed to slip and the one of the first frictional engagement element and the second frictional engagement element allowed to slip in the first slip state is not allowed to slip, each of the first slip state and the second slip state controlling the driving force transmitted to the at least one driving wheel; and complete the shift by preventing both the first frictional engagement element and the second frictional engagement element from slipping. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus for controlling a hybrid vehicle having an engine, a motor-generator, and a clutch disposed between the engine and the motor and configured to vary a transmitted torque capacity, comprising:
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a transmission disposed between the motor-generator and at least one driving wheel having at least two power transmitting paths through the selective engagement of a plurality of frictional engagement elements; and a controller operable to transition the vehicle from an electric running mode to a hybrid running mode and wherein the controller is configured to selectively permit a slip state where at least one of the frictional engagement elements is allowed to slip during transition to the hybrid running mode from the electric running mode so as to control the driving force transmitted to the at least one driving wheel; wherein the slip state of the selected at least one of the frictional engagement elements is conditioned on a requested shift of the transmission in response to a requested driving force of the hybrid vehicle; wherein the selected at least one of the frictional engagement elements permitted to slip is switched during an engine starting process during the start-up of the hybrid running mode; and wherein the switching of the frictional engagement element during the engine starting process first brings a frictional engagement element engaged after the shift, to the slip state, and then switches a frictional engagement element disengaged after the shift, to the slip state. - View Dependent Claims (14, 15)
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16. A hybrid vehicle, comprising:
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an engine; a motor-generator; a clutch disposed between the engine and the motor-generator configured to vary a transmitted torque capacity; a transmission disposed between the motor-generator and at least one driving wheel having at least two power transmitting paths through selective engagement of a plurality of frictional engagement elements; and a controller configured to transition the vehicle from an electric running mode, where the clutch is disengaged, to a hybrid running mode, where the clutch is engaged and the engine has started, and permit a slip state such that each of the plurality of frictional engagement elements that changes state from being engaged before the shift to being disengaged after the shift or from being disengaged before the shift to being engaged after the shift is allowed to slip during the transition so as to control the driving force transmitted to the at least one driving wheel. - View Dependent Claims (17)
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18. A method for controlling a hybrid vehicle having an engine, a motor-generator, a clutch disposed between the engine and the motor and configured to vary a transmitted torque capacity, and a transmission disposed between the motor-generator and at least one driving wheel and having at least two power transmitting paths through the selective engagement of a plurality of frictional engagement elements, the method comprising:
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performing a transition of the vehicle from an electric running mode wherein the clutch is disengaged to a hybrid running mode wherein the clutch is engaged and the engine is started using a controller, the transition responsive to a request for start up of the engine; determining a need for a shift of the transmission responsive to a request for driving force for the vehicle using the controller, at least a first frictional engagement element changing from being engaged before the shift to being disengaged after the shift or changing from being disengaged before the shift to being engaged after the shift; responsive an earlier of determining the need for the shift and the request for start up of the engine, using the controller to permit a first slip state where one of the first frictional engagement element and a second frictional engagement element is allowed to slip while the other of the first frictional engagement element and the second frictional engagement element is not allowed to slip; during the transition, using the controller to perform a switch to permit a second slip state where the other of the first frictional engagement element and the second frictional engagement element is allowed to slip and the one of the first frictional engagement element and the second frictional engagement element allowed to slip in the first slip state is not allowed to slip, each of the first slip state and the second slip state controlling the transmission of the driving force to the at least one driving wheel; and completing the shift by the controller preventing both the first frictional engagement element and the second frictional engagement element from slipping. - View Dependent Claims (19, 20)
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Specification