Source: http://www.google.com/patents/US20030088343?dq=5,381,459
Timestamp: 2017-11-18 19:52:44
Document Index: 253468558

Matched Legal Cases: ['art 1', 'art 2', 'art 1', 'art 1', 'art 1', 'art 1', 'art 1']

Patent US20030088343 - Vehicle drive apparatus, method and computer program - Google Patents
The object of the present invention is to provide a vehicle drive system which enables setting of appropriate start-up torque and restraining of progress of battery deterioration. A vehicle drive apparatus having an electric motor, which is driven with electricity supplied by a battery, for driving a...http://www.google.com/patents/US20030088343?utm_source=gb-gplus-sharePatent US20030088343 - Vehicle drive apparatus, method and computer program
Publication number US20030088343 A1
Also published as US6879888
Publication number 10242690, 242690, US 2003/0088343 A1, US 2003/088343 A1, US 20030088343 A1, US 20030088343A1, US 2003088343 A1, US 2003088343A1, US-A1-20030088343, US-A1-2003088343, US2003/0088343A1, US2003/088343A1, US20030088343 A1, US20030088343A1, US2003088343 A1, US2003088343A1
Patent Citations (8), Referenced by (43), Classifications (69), Legal Events (5)
US 20030088343 A1
a torque decreasing means for decreasing said torque requirement in case said discharge power is more than said upper limit when said internal combustion engine is started up by said electric motor.
3. A vehicle drive apparatus according to claim 1, wherein said apparatus further comprises:
4. A vehicle drive apparatus according to claim 2, wherein said apparatus further comprises:
5. A vehicle drive apparatus according to claim 1, wherein said apparatus further comprises:
6. A vehicle drive apparatus according to claim 2, wherein said apparatus further comprises:
7. A vehicle drive apparatus according to claim 3, wherein said apparatus further comprises:
8. A vehicle drive apparatus according to claim 4, wherein said apparatus further comprises:
decreasing said torque requirement in case said discharge power is more than said upper limit when said internal combustion engine is started up by said electric motor.
decreasing said torque requirement in case said discharge power entered by a power detecting means for detecting said discharge power of said electricity storage reservoir is more than said upper limit, when said internal combustion engine is started up by said electric motor.
[0015]FIG. 1 is a block diagram showing an overall structure of the driving line of a hybrid vehicle to which the vehicle drive apparatus according to the present invention is applied.
[0016]FIG. 2 is a block diagram showing functional deployment of the start-up torque control means shown in FIG. 1.
[0017]FIG. 3 is a flow chart describing operation of the start-up torque control means shown in FIG. 2.
[0018]FIG. 4 is time chart 1 which shows execution of an operation according to the flow chart shown in FIG. 3: the upper figure shows history of the start-up torque requirement and the lower one that of the battery discharge power.
[0019]FIG. 5 is time chart 2 which complements time chart 1 shown in FIG. 4: the upper figure shows history of the start-up torque requirement and the lower one that of the battery discharge power.
[0021]FIG. 1 is a block diagram showing an overall structure of the drive line of a hybrid vehicle including the vehicle drive apparatus.
The engine ECU 21 receives an ignition signal from an ignition switch SW (not shown), a throttle angle 0th from a throttle angle sensor mounted on a throttle pedal (not shown), a revolution speed Ne from a revolution speed sensor NeS of the engine 11 and an engine cooling water temperature Tw from a cooling water temperature sensor TwS of the engine 11. It also determines the injection amount for a fuel injection valve IJ, the angle for a throttle valve TH, an angle for exhaust valve and ignition timing and sends the injection amount to the fuel injection valve IJ, for example.
Each component of the start-up torque control means 220 will be described start-up torque map) is so arranged that TQf is set to be a constant large value for the low region of revolution speed Ne and smaller as Ne increases for the high region of revolution speed Ne. The reason for it is that the start-up torque requirement TQs (basic start-up torque requirement TQf) doesn't need to be kept large since starting up of the engine 11 is completed once the revolution speed Ne reaches some high value. This map is designed based on theoretical calculation and experiment. The basic start-up torque requirement TQf determined by the basic start-up torque setting means 221 is sent to the start-up torque adjust means 225 in the latter stage.
The start-up torque adjust means 225 receives the torque adjust flag F set by the discharge power restriction judging means 224 as well as the basic start-up torque requirement TQf set by the basic start-up torque setting means 221 and the start-up torque requirement TQs (previous value). When the torque adjust flag F is [0 (increase command)], the means 225 increases the start-up torque requirement TQs (previous value) by adding a predetermined value step by step under the conditions that TQs doesn't exceed the basic start-up torque requirement TQf (TQs′=TQs(previous value)+ΔTQ, TQs′≦TQf). When the torque adjust flag F is [1 (decrease command)] on the other hand, the means 225 decreases the lower one, either the basic start-up torque requirement TQf or the start-up torque requirement TQs (previous value), by subtracting a predetermined value step by step (TQs′=TQf−ΔTQ or TQs′=TQs (previous value)−ΔTQ).
The start-up torque setting means 227 receives the start-up torque requirement TQs′ and the minimum start-up torque requirement TQm. If TQs′ is less than TQm, the means 227 sets TQm as a final start-up torque requirement TQs (TQs=TQm). On the other hand if TQs′ is not less than TQm, the means 227 automatically sets TQs′ as a final start-up torque requirement TQs(TQs=TQs′). In this way an undesirable situation in which the engine 11 cannot be successfully started up due to an inappropriately small TQs can be prevented. The means 227 has a comparison function and a data replacement function for that. The finalized start-up torque requirement TQs is sent to PDU 15, thereby driving the motor 12. The motor 12 then starts up the engine 11. The start-up torque requirement TQs is also sent to the start-up torque adjust means 225 as a start-up torque requirement TQs (previous value).
d. Operation of vehicle drive apparatus The operation of the aforementioned vehicle drive apparatus will be described with the flow chart shown in FIG. 3, referring to FIGS. 1 and 2.
[0047]FIG. 3 is a flow chart describing operation of the start-up torque control means shown in FIG. 2.
If Pb is not more than Pu (NO) at step S13, at step S14 the start-up torque adjust means 225 shown in FIG. 2 computes a start-up torque requirement TQs′ by adding a predetermined value to the start-up torque requirement TQs (previous value) under the conditions that TQs′ doesn't exceed the basic start-up torque requirement TQf (TQs′=TQs (previous value) +ΔTQ, TQs′≦TQf).
On the other hand if Pb is more than Pu (YES) at step S13, at step 15 the means 225 computes a start-up torque requirement TQs′ by subtracting a predetermined value from the smaller one, either the basic start-up torque requirement TQf or the start-up torque requirement TQs (previous value) (TQs′=TQf−ΔTQ or TQs′=TQs (previous value)−ΔTQ, TQs′≦TQf).
The start-up torque setting means 227 judges whether or not the starting torque requirement TQs′ is less than the minimum start-up torque requirement TQm (TQs′<TQm) at step S19. If TQs′ is not less than TQm (NO), the means 227 automatically sets TQs′ for TQs (TQs=TQs′) at step S20. On the other hand if TQs′ is less than TQm (YES), the means 227 sets TQs for TQm (TQs=TQm) at step S21.
[0062]FIG. 4 referred to as time chart 1 represents the execution of an operation according to the flow chart shown in FIG. 3. An upper figure shows a history of the start-up torque requirement and the lower one a history of the discharge power. In this connection, the revolution speed Ne on this time chart 1 is directly proportional to the elapsed time approximately. Also a start-up torque requirement TQs shown by a solid line is in accord with a value on the basic start-up torque map shown in FIGS. 2 and 3 (corresponding to the case without controlling of the start-up torque requirement).
Since the discharge power Pb of the battery 16 reaches the discharge power upper limit Pu at P2 (see the lower figure in FIG. 4). decreasing of either the basic start-up torque requirement TQf or the start-up torque requirement TQs′ by the start-up torque adjust means 225 is initiated. The start-up torque requirement TQs then starts decreasing gradually as shown by a bold broken line on the upper figure. The discharge power Pb of the battery 16 starts accordingly decreasing or leveling off as shown in the lower figure. The processes done here correspond to those at S13 and S15 of the flow chart shown in FIG. 3. In this connection the battery temperature Tb is assumed to be low for the time chart 1. If the predetermined ΔTQ at S15 in FIG. 3 is increased, the slope of decreasing will be steeper.
At P3 (see the upper figure in FIG. 4), starting up of the engine 11 will be unstable if the start-up torque requirement TQs (TQs′) falls to be less than the minimum start-up torque requirement TQm. Also the quality of the engine exhaust emissions will be deteriorated. For this reason, the minimum start-up torque requirement TQm is set for the start-up torque requirement TQs. In this way the start-up torque requirement TQs can be prevented from being less than the minimum starting torque requirement TQm (see the bold broken line in the upper figure). The processes initiated at P3 correspond to those at S16-S21 of the flow chart in FIG. 3. In this connection SOC is assumed to be in a high state for the time chart 1.
Next at P4 (see the upper figure of FIG. 4) when the revolution speed Ne of engine 11 reaches a somewhat high value (e.g. 800-1000 rpm), the basic start-up torque requirement TQf defined by the basic start-up torque map shown in FIGS. 2 and 3 will start decreasing as the engine 11 start-up nears completion. Since the start-up torque requirement TQs (TQs′) is, however, smaller than the basic start-up torque requirement TQf at this point, TQs keeps a small value shown by a bold broken line on the upper figure.
As shown in S13 and S14 of FIG. 3, the start-up torque requirement TQs once beginning to decrease is increased with a predetermined value step by step within the basic start-up torque requirement TQf, when the discharge power Pb is not more than the discharge power upper limit Pu (Pb≦Pu). In this way, as shown by a bold broken line on the upper figure in FIG. 5, the start-up torque requirement TQs (TQs′) goes up and down alternately. It means that the start-up torque requirement TQs will not continue decreasing.
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U.S. Classification 701/22, 903/917, 180/65.28, 180/65.29, 180/65.27, 180/65.25, 180/65.285
International Classification H02J7/00, B60K6/20, B60L11/14, B60W10/06, F02D29/06, F02N11/08, B60W10/26, B60K6/54, B60W20/00, B60R16/02, B60L11/18, B60W10/08, B60K6/48, F02N11/04, B60K6/485, F02D45/00, F02D29/02, B60L15/20
Cooperative Classification B60W20/13, B60W10/06, Y02T10/645, Y02T10/70, Y10S903/917, B60W2510/082, Y02T10/7077, B60L15/2045, B60W10/26, B60L2240/423, B60K6/48, B60L11/1874, B60L2240/441, B60L11/14, B60W2510/244, Y02T10/7283, Y02T10/6221, Y02T10/6286, B60W2710/083, B60W10/08, Y02T10/705, B60W20/00, B60L2240/421, Y02T10/7044, B60W2510/0638, B60L11/1862, B60L2240/36, B60K6/54, B60W2510/246, Y02T10/7005, B60L11/187, B60L3/0046
European Classification B60L3/00F6, B60L11/14, B60L11/18M34, B60L11/18M28T, B60L11/18M34D, B60K6/54, B60W10/06, B60L15/20E, B60W10/08, B60W10/26, B60K6/48, B60W20/00