Source: http://patents.com/us-9806663.html
Timestamp: 2018-02-18 18:36:20
Document Index: 92809095

Matched Legal Cases: ['art 62', 'art 51', 'art 65', 'art 20', 'art 65', 'art 20', 'art 62']

US Patent # 9,806,663. Rotary electric machine control apparatus - Patents.com
United States Patent 9,806,663
He , et al. October 31, 2017
He; Xuezhi (Kariya, JP), Nishiyama; Masaki (Kariya, JP), Yamashita; Hirofumi (Kariya, JP)
Family ID: 1000002922673
15/235,605
US 20170141716 A1 May 18, 2017
Nov 13, 2015 [JP] 2015-223011
Current CPC Class: H02P 29/68 (20160201); H02P 27/06 (20130101); H02P 25/03 (20160201)
Current International Class: H02P 1/04 (20060101); H02P 27/06 (20060101); H02P 7/00 (20160101); H02P 29/68 (20160101); H02P 25/03 (20160101); H02P 3/00 (20060101)
Field of Search: ;318/434,472,473
5227703 July 1993 Boothe
6960152 November 2005 Aoki
7353094 April 2008 Okoshi
7642738 January 2010 Hamada
7663329 February 2010 Muta
8062170 November 2011 West
8089234 January 2012 Takizawa
8096919 January 2012 Takizawa
8773058 July 2014 Baglino
2004/0235613 November 2004 Aoki
2004/0249518 December 2004 Okoshi
2008/0048591 February 2008 Hamada
2009/0088294 April 2009 West
2009/0120701 May 2009 Taguchi
2009/0288634 November 2009 Takizawa
2010/0235031 September 2010 Yoshida
2010/0320951 December 2010 Hasegawa
2012/0007532 January 2012 Baglino
2012/0101675 April 2012 Saito
2015/0112531 April 2015 Nakajima
2015/0115531 April 2015 Ali
1. A rotary electric machine control apparatus for controlling driving of a rotary electric machine, which is a drive power source of a vehicle, the rotary electric machine control apparatus comprising: a temperature calculation part for calculating a system temperature of a rotary electric machine driving system in response to a temperature of an inverter part or a temperature of a booster part sensed by a temperature sensor; and a torque limitation part for limiting a torque of the rotary electric machine, when the system temperature increases to be higher than a limitation starting temperature, wherein the torque limitation part continues a torque limitation performed at a peak temperature of the system temperature until a limitation continuation period elapses, the peak temperature indicating a change of the system temperature from increasing to decreasing as a result of limiting the torque of the rotary electric machine, wherein the rotary electric machine driving system includes the rotary electric machine and a driving circuit part, and wherein the driving circuit part includes the inverter part for switching over current supply to the rotary electric machine and/or the booster part for boosting DC power of an output voltage.
2. The rotary electric machine control apparatus according to claim 1, wherein: the torque limitation part assumes that the limitation continuation period has elapsed when the system temperature decreases to be lower than a limitation ending temperature.
3. The rotary electric machine control apparatus according to claim 2, wherein: the limitation ending temperature is set to be lower than the limitation starting temperature.
4. The rotary electric machine control apparatus according to claim 2, wherein: the limitation ending temperature is set variably in accordance with at least one of a driving state of the rotary electric machine, a cooling ability of the rotary electric machine driving system and a degradation state of the rotary electric machine driving system.
5. The rotary electric machine control apparatus according to claim 1, wherein: the torque limitation part gradually decreases a limitation value for the torque limitation, when the limitation continuation period elapses after the system temperature has changed to decreasing at the peak temperature.
6. The rotary electric machine control apparatus according to claim 1, wherein: the limitation starting temperature is set variably in accordance with at least one of a driving state of the rotary electric machine, a cooling ability of the rotary electric machine driving system and a degradation state of the rotary electric machine driving system.
7. The rotary electric machine control apparatus according to claim 1, wherein: the torque limitation part includes a change detection part for detecting the change of the system temperature from increasing to decreasing after starting torque limitation at the limitation starting temperature.
8. The rotary electric machine control apparatus according to claim 1, wherein: the torque limitation part limits the torque of the rotary electric machine by using a torque limitation value, which is set to decrease with an increase in the system temperature; and the torque limitation part continues to use same torque limitation value, which is set at the peak temperature, until the limitation continuation period elapses irrespective of a decrease in the system temperature.
The torque limitation part 62 limits the torque command value trq* based on the element temperature Te and calculates a limited torque command value trq*_a. The limited torque command value trq*_a is calculated by multiplying the torque command value trq* by a torque limitation coefficient k. The torque limitation coefficient k is set as 0.ltoreq.k.ltoreq.1. By setting the torque limitation coefficient k to be smaller than 1 (that is, k<1), the torque of the MG 3 is limited. When the torque limitation coefficient k is 1, the limited torque command value trq*_a equals the torque command value trq* supplied from the vehicle control part 51 and hence the torque of the MG 3 is not limited.
The signal generation part 65 generates the inverter driving signals for controlling on-off operations of the SW elements 31 to 36 to the driving circuit part 20. The inverter driving signals are generated based on the limited torque command value trq*_a, a rotation angle .theta. of the MG 3 acquired from a rotation angle sensor (not shown). The signal generation part 65 generates the converter driving signals for controlling the on-off operations of the SW elements 24 and 25 and outputs the converter driving signals to the driving circuit part 20.
At S102, the torque limitation part 62 checks whether a decrease check flag FlgD described below is set. In the figure, "1" indicates that each flag is in a set-state and "0" indicates that each flag is not in the set-state. When the decrease check flag FlgD is in the set-state (S102: YES), the processing is shifted to S111. When the decrease check flag FlgD is not in the set-state (S102: NO), the processing is shifted to S103.
In the present embodiment, the torque is limited by setting the limited torque command value to be the product of the torque limitation coefficient k and the torque command value trq* and controlling the rotary electric machine based on the limited torque command value k.times.trq*. As the other embodiment, in a case of controlling a rotary electric machine by feedback control, the torque of the rotary electric machine may be limited by limiting a feedback gain. The rotary electric machine may be controlled in any one of methods, which are current feedback control, torque feedback control, feed-forward control and the like.
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