Control system for hybrid vehicle
First Claim
1. A control system for a hybrid vehicle, the hybrid vehicle including a first drive unit having a first motor and a planetary gear for power distribution capable of distributing a driving force of an engine to the first motor and a transmission shaft connected to a drive wheel while the first motor outputs a reaction force;
- and a second drive unit having a second motor and a stepped transmission which is interposed between the second motor and the transmission shaft and which is capable of changing a rotational speed of rotatory transmission of the second motor and the transmission shaft by switch-over of a plurality of friction engagement elements which are controlled so as to be selectively engaged by a hydraulic pressure control executed by a hydraulic pressure control unit, the control system comprising;
first drive control means capable of controlling a driving force which is output from the first drive unit to the transmission shaft;
second drive control means capable of controlling a driving force which is output from the second drive unit to the transmission shaft;
shift control means capable of executing shift control of the stepped transmission; and
driver request output detection means which detects a driver request output that is requested by a driver, wherein the first drive control means and the second drive control means execute control such that the driving force output from the first drive unit and the second drive unit to the drive wheels equals the driver request output;
during-shift drive control means which controls the driving force output from the second drive unit such that the driving force output from the first drive unit and the second drive unit to the drive wheel equals the driver request output;
executes control so as to reduce a difference between the driving force output to the drive wheel and the driver request output based on a change in a transmission force of the stepped transmission that results from the switch-over of the plurality of friction engagement elements; and
which controls the driving force of the second motor so as to absorb an inertial force which is generated by a change in the rotational speed of the second motor, with respect to the rotational speed of the drive wheels in an inertial phase of the switch-over of the plurality of friction engagement elements.
1 Assignment
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Accused Products
Abstract
A control system for a hybrid vehicle that is capable of absorbing an inertial force which is generated during shifting of a stepped transmission. During shift control of the stepped transmission by a shift control device and before the shift control is completed, a during-shift drive control element controls a driving force which is output from a second drive unit such that a total driving force which is output from first and second drive units to the drive wheels equals a driver request output. Further, the during-shift drive control elements executes control so as to reduce a difference between the total driving force output to a drive wheel and the driver request output based on a change in a transmission force of the stepped transmission caused by a switch-over between a first brake and a second brake. Moreover, in an inertial phase of the switch-over between the first brake and the second brake, the during-shift drive control means controls a driving force of a second motor so as to absorb an inertial force which is generated by change in a rotational speed of the second motor with respect to the rotational speed of the drive wheel.
94 Citations
20 Claims
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1. A control system for a hybrid vehicle, the hybrid vehicle including a first drive unit having a first motor and a planetary gear for power distribution capable of distributing a driving force of an engine to the first motor and a transmission shaft connected to a drive wheel while the first motor outputs a reaction force;
- and a second drive unit having a second motor and a stepped transmission which is interposed between the second motor and the transmission shaft and which is capable of changing a rotational speed of rotatory transmission of the second motor and the transmission shaft by switch-over of a plurality of friction engagement elements which are controlled so as to be selectively engaged by a hydraulic pressure control executed by a hydraulic pressure control unit, the control system comprising;
first drive control means capable of controlling a driving force which is output from the first drive unit to the transmission shaft;
second drive control means capable of controlling a driving force which is output from the second drive unit to the transmission shaft;
shift control means capable of executing shift control of the stepped transmission; and
driver request output detection means which detects a driver request output that is requested by a driver, wherein the first drive control means and the second drive control means execute control such that the driving force output from the first drive unit and the second drive unit to the drive wheels equals the driver request output;
during-shift drive control means which controls the driving force output from the second drive unit such that the driving force output from the first drive unit and the second drive unit to the drive wheel equals the driver request output;
executes control so as to reduce a difference between the driving force output to the drive wheel and the driver request output based on a change in a transmission force of the stepped transmission that results from the switch-over of the plurality of friction engagement elements; and
which controls the driving force of the second motor so as to absorb an inertial force which is generated by a change in the rotational speed of the second motor, with respect to the rotational speed of the drive wheels in an inertial phase of the switch-over of the plurality of friction engagement elements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
- and a second drive unit having a second motor and a stepped transmission which is interposed between the second motor and the transmission shaft and which is capable of changing a rotational speed of rotatory transmission of the second motor and the transmission shaft by switch-over of a plurality of friction engagement elements which are controlled so as to be selectively engaged by a hydraulic pressure control executed by a hydraulic pressure control unit, the control system comprising;
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19. A control system for a hybrid vehicle, the hybrid vehicle including a first drive unit having a first motor and a planetary gear for power distribution capable of distributing a driving force of an engine to the first motor and a transmission shaft connected to a drive wheel while the first motor outputs a reaction force;
- and a second drive unit having a second motor and a stepped transmission which is interposed between the second motor and the transmission shaft and which is capable of changing a rotational speed of rotatory transmission of the second motor and the transmission shaft by switch-over of a plurality of friction engagement elements which are controlled so as to be selectively engaged by a hydraulic pressure control executed by a hydraulic pressure control unit, the control system comprising;
a first drive control element that controls a driving force which is output from the first drive unit to the transmission shaft;
a second drive control element that controls a driving force which is output from the second drive unit to the transmission shaft;
a shift control element that executes shift control of the stepped transmission; and
a driver request output detection element that detects a driver request output that is requested by a driver, wherein the first drive control element and the second drive control element execute control such that the driving force output from the first drive unit and the second drive unit to the drive wheels equals the driver request output;
a during-shift drive control element that controls the driving force output from the second drive unit such that the driving force output from the first drive unit and the second drive unit to the drive wheel equals the driver request output;
executes control so as to reduce a difference between the driving force output to the drive wheel and the driver request output based on a change in a transmission force of the stepped transmission that results from the switch-over of the plurality of friction engagement elements; and
controls the driving force of the second motor so as to absorb an inertial force which is generated by a change in the rotational speed of the second motor, with respect to the rotational speed of the drive wheels in an inertial phase of the switch-over of the plurality of friction engagement elements.
- and a second drive unit having a second motor and a stepped transmission which is interposed between the second motor and the transmission shaft and which is capable of changing a rotational speed of rotatory transmission of the second motor and the transmission shaft by switch-over of a plurality of friction engagement elements which are controlled so as to be selectively engaged by a hydraulic pressure control executed by a hydraulic pressure control unit, the control system comprising;
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20. A control method for a hybrid vehicle, the hybrid vehicle including a first drive unit having a first motor and a planetary gear for power distribution capable of distributing a driving force of an engine to the first motor and a transmission shaft connected to a drive wheel while the first motor outputs a reaction force;
- and a second drive unit having a second motor and a stepped transmission which is interposed between the second motor and the transmission shaft and which is capable of changing a rotational speed of rotatory transmission of the second motor and the transmission shaft by switch-over of a plurality of friction engagement elements which are controlled so as to be selectively engaged by a hydraulic pressure control executed by a hydraulic pressure control unit, the control method comprising;
controlling a driving force which is output from the first drive unit to the transmission shaft;
controlling a driving force which is output from the second drive unit to the transmission shaft;
executing shift control of the stepped transmission; and
detecting a driver request output that is requested by a driver;
executing control such that the driving force output from the first drive unit and the second drive unit to the drive wheels equals the driver request output;
controlling the driving force output from the second drive unit such that the driving force output from the first drive unit and the second drive unit to the drive wheel equals the driver request output;
executing control so as to reduce a difference between the driving force output to the drive wheel and the driver request output based on a change in a transmission force of the stepped transmission that results from the switch-over of the plurality of friction engagement elements; and
controlling the driving force of the second motor so as to absorb an inertial force which is generated by a change in the rotational speed of the second motor, with respect to the rotational speed of the drive wheels in an inertial phase of the switch-over of the plurality of friction engagement elements.
- and a second drive unit having a second motor and a stepped transmission which is interposed between the second motor and the transmission shaft and which is capable of changing a rotational speed of rotatory transmission of the second motor and the transmission shaft by switch-over of a plurality of friction engagement elements which are controlled so as to be selectively engaged by a hydraulic pressure control executed by a hydraulic pressure control unit, the control method comprising;
Specification