# US 2017/0282928 A1 · Vehicle drive system

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- Number: US 2017/0282928 A1
- Document ID: US20170282928A1
- Status: Published application
- Kind: A1
- Application number: 15/474,021
- Filed: 2017-03-30
- Published: 2017-10-05
- Earliest claimed: 2016-03-31
- Assignees: Honda Motor Co., Ltd.
- Applicants: Honda Motor Co., Ltd.
- Inventors: Yusuke Sakaguchi; Satoshi Ando; Masatoshi Noguchi
- Web page: https://patentgrep.com/patent/US20170282928A1

## CPC

- B60W 30/18172: {Preventing, or responsive to skidding of wheels}
- B60K 7/0007: {the motor being electric}
- B60K 17/046: {with planetary gearing having orbital motion}
- B60K 17/348: having differential means for driving one set of wheels, e.g. the front, at one speed and the other set, e.g. the rear, at a different speed (B60K17/346 takes precedence)
- B60K 28/16: responsive to, or preventing, spinning or skidding of wheels
- B60W 10/06: including control of combustion engines
- B60W 10/08: including control of electric propulsion units, e.g. motors or generators
- B60W 20/10: Controlling the power contribution of each of the prime movers to meet required power demand
- B60W 30/02: Control of vehicle driving stability
- B60W 30/188: Controlling power parameters of the driveline, e.g. determining the required power
- B60K 1/02: comprising more than one electric motor
- B60K 2007/0046: {the motor moving together with the vehicle body, i.e. moving independently from the wheel axle}
- B60K 2007/0092: {the motor axle being coaxial to the wheel axle}
- B60W 2050/0004: {In digital systems, e.g. discrete-time systems involving sampling}
- B60W 2300/18: Four-wheel drive vehicles
- B60W 2520/125: Lateral acceleration
- B60W 2520/26: Wheel slip
- B60W 2520/263: Slip values between front and rear axle
- B60W 2520/30: Wheel torque
- B60Y 2400/427: One-way clutches
- Y02T 10/62: Hybrid vehicles
- B60W: CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60Y: INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A vehicle drive system includes a slip acquisition unit that acquires that an excessive slip of front wheels or rear wheels has occurred, an addition slip point calculating unit that calculates addition slip points in a time-discrete manner, based on the slip acquisition unit having acquired that the excessive slip has occurred, a cumulative slip point calculating unit that accumulates the addition slip points and calculates a cumulative slip point over time, a drive state switching unit that, switches between 2WD and AWD based on cumulative slip points, and an increase forbidding determination unit that forbids addition or accumulation of the addition slip points, or increase of the cumulative slip points, in a case where a lateral acceleration correlation value that has correlation with lateral acceleration of the vehicle exceeds a lateral acceleration threshold value.

## Claims

### Claim 1

A vehicle drive system comprising:
a first drive device configured to drive a first drive wheel, which is either a front wheel or a rear wheel of a vehicle;
a second drive device configured to drive second drive wheel, which is the other of the front wheel or the rear wheel of the vehicle; and
a control device configured to control the first drive device and the second drive device and to control a drive state of the first drive wheel and the second drive wheel,
wherein the control device comprises
a slip acquisition unit configured to acquire that an excessive slip, which is slipping of the first drive wheel or the second drive wheel by a predetermined amount or more, is occurring,
an addition slip point calculating unit configured to calculate addition slip points in a time-discrete manner, based on the slip acquisition unit having acquired that the excessive slip has occurred,
a cumulative slip point calculating unit configured to accumulate the addition slip points and calculate a cumulative slip point over time,
a drive state switching unit configured to realize an in part-wheel drive state where the vehicle is driven by only one of the first drive wheel and the second drive wheel in a case where the cumulative slip point is smaller than a predetermined drive state switching threshold value, and to realize an all-wheel drive state where the vehicle is driven by both the first drive wheel and the second drive wheel in a case where the cumulative slip point is equal to or greater than the drive state switching threshold value, and
an increase forbidding determination unit configured to forbid at least one of: the addition of the addition slip points; the accumulation of the addition slip points; and increase of the cumulative slip points, in a case where the lateral acceleration correlation value that has correlation with the lateral acceleration of the vehicle exceeds a predetermined lateral acceleration threshold value.

### Claim 2 (depends on 1)

The vehicle drive system according to claim 1,
wherein the control device causes the forbidding determination unit to forbid said at least one of the addition of the addition slip points, the accumulation of the addition slip points, and the increase of the cumulative slip points, in a case where the lateral acceleration correlation value exceeds the lateral acceleration threshold value in the two-wheel drive state.

### Claim 3 (depends on 1)

The vehicle drive system according to claim 1,
wherein the control unit further comprises a determining unit that, in a case where the cumulative slip point is smaller than the drive state switching threshold value in the all-wheel drive state, determines whether or not conditions for the drive state switching unit to realize the two-wheel drive state have been satisfied, and
wherein, in a case where the cumulative slip point is smaller than the drive state switching threshold value and also the conditions to realize the two-wheel drive state have been satisfied, the drive state switching unit realizes the two-wheel drive state.

### Claim 4 (depends on 1)

The vehicle drive system according to claim 1,
wherein the control unit further comprises a subtraction slip point calculating unit configured to calculate subtraction slip points in a time-discrete manner, based on the slip acquisition unit having not acquired that an excessive slip has occurred, and
wherein the cumulative slip point calculating unit accumulates the subtraction slip points in addition to the addition slip points.