I am using the built-in SimDriveline demo model "drive_4wd_dynamics.mdl", and I have observed an initial negative engine velocity in the simulation. I am trying to define initial conditions for the engines in SimDriveline 1.5.2 (R2009a) to work around the negative velocity, but could not find such an option in the block parameters.
MATLAB: Is it possible to define initial conditions for engines in SimDriveline 1.5.2 (R2009a)
conditionengineinitialSimscape Driveline
Related Solutions
This is expected behavior. The workaround is to use a "Signal Builder" block with an "Ideal Torque Source" to generate a impulse torque which can spin the Generic Engine to a velocity which is greater than the stall speed. If the throttle is on at this point, it will maintain the engine's velocity.
The included model called "sdl_vehicle_starter" starts from no throttle and an engine stall, applies a throttle at t = 60 seconds, and then initiates the starter motor via the Ideal Torque Source at t = 90 seconds.
NOTE: From R2013a onwards Generic Engine in SimDriveline has new feature of Idle speed control, through which the same functionality can be achieved without the additional Torque Source:
-> Idle Speed Control -> Enable idle speed controller
Your version is too old
function [x,wasMatrix,err] = tonndata(x,columnSamples,cellTime)
%TONNDATA Convert data to standard neural network cell array form.
%
% tonndata and fromnndata convert data from and to standard neural
% network form.
% % Standard neural network cell array data consists of a cell array which
% has as many rows as there are signals and as many columns as there are
% timesteps. Each i,jth element of the cell array is a matrix which has
% as many rows as the ith signal has elements and as many columns as
% there are samples.
% % [Y,wasMatrix] = tonndata(x,columnSamples,cellTime) takes matrix or cell
% array data X and converts it to standard neural network cell data Y.
%
% If columnSamples is false, then matrix X or matrices in cell array X
% will be transposed, so row samples will now be stored as column vectors.
% % If cellTime is false, then matrix samples will be separated into columns
% of a cell array so time originally represented as vectors in a matrix
% will now be represented as columns of a cell array.
% % The returned value wasMatrix can be used by FROMNNDATA to reverse the
% transformation.
% % Here data consisting of six timesteps of 5-element vectors is originally
% represented as a matrix with six columns is converted to standard
% neural network representation and back.
% % x = rand(5,6)
% [y,wasMatrix] = tonndata(x,true,false)
% x2 = fromnndata(y,wasMatrix,columnSamples,cellTime)
% % Here data is defined in standard neural network data cell form.
% Converting this data does not change it. The data consists of three
% time series samples of 2-element signals over 3 timesteps.
% % See also FROMNNDATA
% Copyright 2010 The MathWorks, Inc.
Thank you for formally accepting my answer
P.S. You can convert data between matrix and cell formats without using this function
Greg
Related Question
- How to set the initial attitude and rotational velocity of a free body in SimMechanics 2.2.1 (R14SP1)
- How to simulate a vehicle coasting down a slope using the Torque Converter block in SimDriveline
- Engine Model
- Rack and pinion on moving base SimMechanics 1st generation
- Does the model containing SimDriveline blocks produce algebraic loop warnings in SimDriveline 1.0.1 (R14SP1)
- Modeling V-belts and Chain Drives in SimMechanics
- Do I receive an error regarding initialization commands when I run the model in SimDriveline 1.0.2 (R14SP2)
Best Answer